Re: rcu_preempt self-detected stall on CPU from 4.5-rc3, since 3.17

[Boqun Feng <boqun.feng@gmail.com>]

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On Wed, Mar 30, 2016 at 06:30:38AM -0700, Paul E. McKenney wrote:
[...]
> > > 
> > 
> > I ran several tests similar to this setup in a guest, the guest was
> > running in a 12-core Xeon X5690 host with kernel 4.4.5. The guest was
> > given 16 VCPUs and 2G memory.
> > 
> > Rather than RCU stall warnings, I was able to see a bug like this nearly

To be accurate, I did see RCU stall warnings, after the NULL pointer
dereference, but for every run, the NULL pointer dereference always
happened first. 

> > *everytime*:
> > 
> > [  308.291635] BUG: unable to handle kernel NULL pointer dereference at           (null)
> > [  308.292063] IP: [<ffffffff810b9452>] migrate_timer_list+0x32/0xc0
> 
> New one on me!
> 
> > [  308.292063] PGD 0 
> > [  308.292063] Oops: 0002 [#1] PREEMPT SMP 
> > [  308.292063] Modules linked in:
> > [  308.292063] CPU: 11 PID: 798 Comm: torture_onoff Not tainted 4.5.0-rc1+ #14
> > [  308.292063] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.1-20160216_104851-anatol 04/01/2014
> > [  308.292063] task: ffff88007cafcb00 ti: ffff88007c6f4000 task.ti: ffff88007c6f4000
> > [  308.292063] RIP: 0010:[<ffffffff810b9452>]  [<ffffffff810b9452>] migrate_timer_list+0x32/0xc0
> > [  308.292063] RSP: 0018:ffff88007c6f7c98  EFLAGS: 00010086
> > [  308.292063] RAX: dead000000000200 RBX: ffff88007fb6cc00 RCX: ffff88007fa2cc00
> > [  308.292063] RDX: 0000000000000000 RSI: ffff88007fa2d6d0 RDI: ffff88007fb6cc00
> > [  308.292063] RBP: ffff88007c6f7cc0 R08: 0000000000000000 R09: ffffffff81e4d360
> > [  308.292063] R10: ffffea0001f2daa0 R11: 0000000000000000 R12: ffff88007fa2d6d0
> > [  308.292063] R13: ffff88007fb6cc00 R14: 000000000000000b R15: ffff88007fa2c420
> > [  308.292063] FS:  0000000000000000(0000) GS:ffff88007fb60000(0000) knlGS:0000000000000000
> > [  308.292063] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
> > [  308.292063] CR2: 0000000000000000 CR3: 0000000001e0f000 CR4: 00000000000006e0
> > [  308.292063] Stack:
> > [  308.292063]  ffff88007fb6cc00 ffff88007fa2d6d8 ffff88007fa2dad0 ffff88007fa2d8d0
> > [  308.292063]  ffff88007fa2d4d8 ffff88007c6f7d08 ffffffff810b95c4 ffff88007fa2cc00
> > [  308.292063]  ffff88007fa2d648 00000000fffffff0 ffffffff81e4e0c0 0000000000000007
> > [  308.292063] Call Trace:
> > [  308.292063]  [<ffffffff810b95c4>] timer_cpu_notify+0xe4/0x160
> > [  308.292063]  [<ffffffff81073ea5>] notifier_call_chain+0x45/0x70
> > [  308.292063]  [<ffffffff81073fc9>] __raw_notifier_call_chain+0x9/0x10
> > [  308.292063]  [<ffffffff8105759e>] cpu_notify_nofail+0x1e/0x30
> > [  308.292063]  [<ffffffff81057852>] _cpu_down+0x212/0x350
> > [  308.292063]  [<ffffffff810b3350>] ? __call_rcu.constprop.74+0x380/0x380
> > [  308.292063]  [<ffffffff810b33b0>] ? call_rcu_bh+0x20/0x20
> > [  308.292063]  [<ffffffff810a8950>] ? __rcu_read_unlock+0x50/0x50
> > [  308.292063]  [<ffffffff810a8950>] ? __rcu_read_unlock+0x50/0x50
> > [  308.292063]  [<ffffffff810579bf>] cpu_down+0x2f/0x50
> > [  308.292063]  [<ffffffff811266b5>] torture_onoff+0x115/0x380
> > [  308.292063]  [<ffffffff811265a0>] ? torture_kthread_stopping+0x70/0x70
> > [  308.292063]  [<ffffffff810732f6>] kthread+0xd6/0xf0
> > [  308.292063]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
> > [  308.292063]  [<ffffffff818b499f>] ret_from_fork+0x3f/0x70
> > [  308.292063]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
> > [  308.292063] Code: 56 41 55 41 54 53 48 8b 06 44 8b 77 40 48 85 c0 74 53 49 89 fd 49 89 f4 4d 8b 3c 24 66 66 66 66 90 49 8b 07 49 8b 57 08 48 85 c0 <48> 89 02 74 04 48 89 50 08 48 b8 00 02 00 00 00 00 ad de 4c 89 
> > [  308.292063] RIP  [<ffffffff810b9452>] migrate_timer_list+0x32/0xc0
> > [  308.292063]  RSP <ffff88007c6f7c98>
> > [  308.292063] CR2: 0000000000000000
> > [  308.292063] ---[ end trace 29cb5d70ad875872 ]---
> > 
> > 
> > I'm not sure whether this is relevant, maybe this was caused by my
> > setup? But I attach two kernel logs and my config in case this could
> > help us solve the problem.
> > 
> > Another interesting I observed was that the time stamps of printk went
> > back in a while in some run, please note the log named "dmesg.1" in the
> > attachments.
> 
> That can cause all sorts of problems, including RCU CPU stall warnings.
> 
> So I see the following in dmesg.1, courtesy of:
> 
> sed -e 's/].*$//' < /tmp/dmesg.1 | awk '{ if (oldtime != "" && oldtime > $2) print; oldtime = $2 }'
> 
> 1.128644 -> 1.128642:  Only two microseconds backwards, so not enough
> 	to cause a stall warning (need about 21 seconds for that).
> 1.143582 -> 1.143575:  Seven microseconds backwards.
> 316.386056 -> 421.191446: 104.8 seconds backwards, plenty to cause
> 	all sorts of problems, including stall warnings.
> 311.122004 -> 316.338053: 5.2 seconds backwards, can cause all sorts
> 	of problems, but not likely stall warnings.
> 
> > A quick analysis of this bug is the null dereference happened at:
> > 
> > 	migrate_timer_list()
> > 	  detach_timer();
> > 	    __list_del();
> > 	      WRITE_ONCE(*pprev, next); <- pprev is NULL
> > 
> > This seems highly unlikely, but as I said, I hit this almost every time
> > after a few minutes of starting rcutoture.
> 
> Looks like a malformed list, which does look quite ugly.  No idea
> whether or not this could be related to backwards-going time, but
> fixing the backwards-going time is a good first step.
> 
> > Any idea about whether this could be related to the RCU stall problem,
> > or this is another bug, or this actually happend by design for some
> > reasons?
> 
> One of your backwards-time incidents could cause both the RCU CPU stall
> warnings and also the soft lockup I see there.
> 
> If this is an older system, it might have an unreliable TSC.  If the
> kernel is nevertheless using TSC, this sort of thing could happen.
> The usual advice is to boot using HPET, but perhaps others on the
> list have more specific advice.
> 

I tried another run, the kernel was compiled with HPET=y and boot
parameters "hpet=force notsc" and I still hit the same problem, any
suggestion for me to go further to get rid of TSC's impact?

Kernel log attached.

Regards,
Boqun

> 							Thanx, Paul
> 

[-- Attachment #1.2: dmesg.3 --]
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[    0.000000] Linux version 4.5.0-rc1+ (root@insomnia) (gcc version 5.3.0 (GCC) ) #14 SMP PREEMPT Wed Mar 30 20:01:04 CST 2016
[    0.000000] Command line: hpet=force notsc selinux=0 console=ttyS0 rcutorture.onoff_interval=1 rcutorture.onff_holdoff=30
[    0.000000] x86/fpu: Legacy x87 FPU detected.
[    0.000000] x86/fpu: Using 'lazy' FPU context switches.
[    0.000000] e820: BIOS-provided physical RAM map:
[    0.000000] BIOS-e820: [mem 0x0000000000000000-0x000000000009fbff] usable
[    0.000000] BIOS-e820: [mem 0x000000000009fc00-0x000000000009ffff] reserved
[    0.000000] BIOS-e820: [mem 0x00000000000f0000-0x00000000000fffff] reserved
[    0.000000] BIOS-e820: [mem 0x0000000000100000-0x000000007ffdefff] usable
[    0.000000] BIOS-e820: [mem 0x000000007ffdf000-0x000000007fffffff] reserved
[    0.000000] BIOS-e820: [mem 0x00000000feffc000-0x00000000feffffff] reserved
[    0.000000] BIOS-e820: [mem 0x00000000fffc0000-0x00000000ffffffff] reserved
[    0.000000] NX (Execute Disable) protection: active
[    0.000000] SMBIOS 2.8 present.
[    0.000000] e820: last_pfn = 0x7ffdf max_arch_pfn = 0x400000000
[    0.000000] x86/PAT: Configuration [0-7]: WB  WC  UC- UC  WB  WC  UC- WT  
[    0.000000] found SMP MP-table at [mem 0x000f6a50-0x000f6a5f] mapped at [ffff8800000f6a50]
[    0.000000] Scanning 1 areas for low memory corruption
[    0.000000] Using GB pages for direct mapping
[    0.000000] RAMDISK: [mem 0x7fcd4000-0x7ffcffff]
[    0.000000] ACPI: Early table checksum verification disabled
[    0.000000] ACPI: RSDP 0x00000000000F6A00 000014 (v00 BOCHS )
[    0.000000] ACPI: RSDT 0x000000007FFE1580 000034 (v01 BOCHS  BXPCRSDT 00000001 BXPC 00000001)
[    0.000000] ACPI: FACP 0x000000007FFE061A 000074 (v01 BOCHS  BXPCFACP 00000001 BXPC 00000001)
[    0.000000] ACPI: DSDT 0x000000007FFDFA80 000B9A (v01 BOCHS  BXPCDSDT 00000001 BXPC 00000001)
[    0.000000] ACPI: FACS 0x000000007FFDFA40 000040
[    0.000000] ACPI: SSDT 0x000000007FFE068E 000DCA (v01 BOCHS  BXPCSSDT 00000001 BXPC 00000001)
[    0.000000] ACPI: APIC 0x000000007FFE1458 0000F0 (v01 BOCHS  BXPCAPIC 00000001 BXPC 00000001)
[    0.000000] ACPI: HPET 0x000000007FFE1548 000038 (v01 BOCHS  BXPCHPET 00000001 BXPC 00000001)
[    0.000000] No NUMA configuration found
[    0.000000] Faking a node at [mem 0x0000000000000000-0x000000007ffdefff]
[    0.000000] NODE_DATA(0) allocated [mem 0x7ffdb000-0x7ffdefff]
[    0.000000] Zone ranges:
[    0.000000]   DMA      [mem 0x0000000000001000-0x0000000000ffffff]
[    0.000000]   DMA32    [mem 0x0000000001000000-0x000000007ffdefff]
[    0.000000]   Normal   empty
[    0.000000] Movable zone start for each node
[    0.000000] Early memory node ranges
[    0.000000]   node   0: [mem 0x0000000000001000-0x000000000009efff]
[    0.000000]   node   0: [mem 0x0000000000100000-0x000000007ffdefff]
[    0.000000] Initmem setup node 0 [mem 0x0000000000001000-0x000000007ffdefff]
[    0.000000] ACPI: PM-Timer IO Port: 0x608
[    0.000000] ACPI: LAPIC_NMI (acpi_id[0xff] dfl dfl lint[0x1])
[    0.000000] IOAPIC[0]: apic_id 0, version 17, address 0xfec00000, GSI 0-23
[    0.000000] ACPI: INT_SRC_OVR (bus 0 bus_irq 0 global_irq 2 dfl dfl)
[    0.000000] ACPI: INT_SRC_OVR (bus 0 bus_irq 5 global_irq 5 high level)
[    0.000000] ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 9 high level)
[    0.000000] ACPI: INT_SRC_OVR (bus 0 bus_irq 10 global_irq 10 high level)
[    0.000000] ACPI: INT_SRC_OVR (bus 0 bus_irq 11 global_irq 11 high level)
[    0.000000] Using ACPI (MADT) for SMP configuration information
[    0.000000] ACPI: HPET id: 0x8086a201 base: 0xfed00000
[    0.000000] smpboot: Allowing 16 CPUs, 0 hotplug CPUs
[    0.000000] PM: Registered nosave memory: [mem 0x00000000-0x00000fff]
[    0.000000] PM: Registered nosave memory: [mem 0x0009f000-0x0009ffff]
[    0.000000] PM: Registered nosave memory: [mem 0x000a0000-0x000effff]
[    0.000000] PM: Registered nosave memory: [mem 0x000f0000-0x000fffff]
[    0.000000] e820: [mem 0x80000000-0xfeffbfff] available for PCI devices
[    0.000000] clocksource: refined-jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 1910969940391419 ns
[    0.000000] setup_percpu: NR_CPUS:16 nr_cpumask_bits:16 nr_cpu_ids:16 nr_node_ids:1
[    0.000000] PERCPU: Embedded 32 pages/cpu @ffff88007fa00000 s92008 r8192 d30872 u131072
[    0.000000] Built 1 zonelists in Node order, mobility grouping on.  Total pages: 515944
[    0.000000] Policy zone: DMA32
[    0.000000] Kernel command line: hpet=force notsc selinux=0 console=ttyS0 rcutorture.onoff_interval=1 rcutorture.onff_holdoff=30
[    0.000000] tsc: Kernel compiled with CONFIG_X86_TSC, cannot disable TSC completely
[    0.000000] PID hash table entries: 4096 (order: 3, 32768 bytes)
[    0.000000] Memory: 2040780K/2096628K available (8931K kernel code, 1258K rwdata, 3700K rodata, 1092K init, 984K bss, 55848K reserved, 0K cma-reserved)
[    0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=16, Nodes=1
[    0.000000] Preemptible hierarchical RCU implementation.
[    0.000000] 	RCU debugfs-based tracing is enabled.
[    0.000000] 	CONFIG_RCU_FANOUT set to non-default value of 2
[    0.000000] 	RCU torture testing starts during boot.
[    0.000000] 	Four(or more)-level hierarchy is enabled.
[    0.000000] 	Build-time adjustment of leaf fanout to 2.
[    0.000000] 	RCU kthread priority: 2.
[    0.000000] NR_IRQS:4352 nr_irqs:552 16
[    0.000000] Console: colour *CGA 80x25
[    0.000000] console [ttyS0] enabled
[    0.000000] clocksource: hpet: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604467 ns
[    0.000000] tsc: Fast TSC calibration using PIT
[    0.000000] tsc: Detected 3467.095 MHz processor
[    0.003000] Calibrating delay loop... 3416.06 BogoMIPS (lpj=1708032)
[    0.009000] pid_max: default: 32768 minimum: 301
[    0.009000] ACPI: Core revision 20160108
[    0.010000] ACPI: 2 ACPI AML tables successfully acquired and loaded
[    0.011000] 
[    0.011000] Security Framework initialized
[    0.011000] SELinux:  Disabled at boot.
[    0.012000] Dentry cache hash table entries: 262144 (order: 9, 2097152 bytes)
[    0.013000] Inode-cache hash table entries: 131072 (order: 8, 1048576 bytes)
[    0.013000] Mount-cache hash table entries: 4096 (order: 3, 32768 bytes)
[    0.014000] Mountpoint-cache hash table entries: 4096 (order: 3, 32768 bytes)
[    0.015000] mce: CPU supports 10 MCE banks
[    0.015000] Last level iTLB entries: 4KB 0, 2MB 0, 4MB 0
[    0.016000] Last level dTLB entries: 4KB 0, 2MB 0, 4MB 0, 1GB 0
[    0.017000] Freeing SMP alternatives memory: 32K (ffffffff8204d000 - ffffffff82055000)
[    0.018000] Switched APIC routing to physical flat.
[    0.019000] ..TIMER: vector=0x30 apic1=0 pin1=2 apic2=-1 pin2=-1
[    0.029000] smpboot: CPU0: Intel(R) Xeon(R) CPU           X5690  @ 3.47GHz (family: 0x6, model: 0x2c, stepping: 0x2)
[    0.030000] Performance Events: 16-deep LBR, Westmere events, Intel PMU driver.
[    0.030000] perf_event_intel: CPUID marked event: 'bus cycles' unavailable
[    0.031000] ... version:                2
[    0.031000] ... bit width:              48
[    0.031000] ... generic registers:      4
[    0.032000] ... value mask:             0000ffffffffffff
[    0.032000] ... max period:             000000007fffffff
[    0.032000] ... fixed-purpose events:   3
[    0.033000] ... event mask:             000000070000000f
[    0.042000] x86: Booting SMP configuration:
[    0.042000] .... node  #0, CPUs:        #1  #2  #3  #4  #5  #6  #7  #8  #9 #10 #11 #12 #13 #14 #15
[    0.200000] x86: Booted up 1 node, 16 CPUs
[    0.200000] smpboot: Total of 16 processors activated (49061.88 BogoMIPS)
[    0.203000] devtmpfs: initialized
[    0.204000] kworker/u32:0 (98) used greatest stack depth: 14264 bytes left
[    0.204000] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 1911260446275000 ns
[    0.204000] RTC time: 14:05:24, date: 03/30/16
[    0.204000] NET: Registered protocol family 16
[    0.206000] kworker/u32:0 (106) used greatest stack depth: 13928 bytes left
[    0.211000] cpuidle: using governor menu
[    0.211000] ACPI: bus type PCI registered
[    0.211000] PCI: Using configuration type 1 for base access
[    0.226000] HugeTLB registered 2 MB page size, pre-allocated 0 pages
[    0.228000] ACPI: Added _OSI(Module Device)
[    0.228000] ACPI: Added _OSI(Processor Device)
[    0.229000] ACPI: Added _OSI(3.0 _SCP Extensions)
[    0.229000] ACPI: Added _OSI(Processor Aggregator Device)
[    0.231000] ACPI: Interpreter enabled
[    0.232000] ACPI: (supports S0 S3 S4 S5)
[    0.232000] ACPI: Using IOAPIC for interrupt routing
[    0.232000] PCI: Using host bridge windows from ACPI; if necessary, use "pci=nocrs" and report a bug
[    0.237000] ACPI: PCI Root Bridge [PCI0] (domain 0000 [bus 00-ff])
[    0.238000] acpi PNP0A03:00: _OSC: OS supports [ASPM ClockPM Segments MSI]
[    0.238000] acpi PNP0A03:00: _OSC failed (AE_NOT_FOUND); disabling ASPM
[    0.239000] acpi PNP0A03:00: fail to add MMCONFIG information, can't access extended PCI configuration space under this bridge.
[    0.240000] PCI host bridge to bus 0000:00
[    0.240000] pci_bus 0000:00: root bus resource [io  0x0000-0x0cf7 window]
[    0.241000] pci_bus 0000:00: root bus resource [io  0x0d00-0xffff window]
[    0.241000] pci_bus 0000:00: root bus resource [mem 0x000a0000-0x000bffff window]
[    0.242000] pci_bus 0000:00: root bus resource [mem 0x80000000-0xfebfffff window]
[    0.242000] pci_bus 0000:00: root bus resource [bus 00-ff]
[    0.246000] pci 0000:00:01.1: legacy IDE quirk: reg 0x10: [io  0x01f0-0x01f7]
[    0.247000] pci 0000:00:01.1: legacy IDE quirk: reg 0x14: [io  0x03f6]
[    0.247000] pci 0000:00:01.1: legacy IDE quirk: reg 0x18: [io  0x0170-0x0177]
[    0.247000] pci 0000:00:01.1: legacy IDE quirk: reg 0x1c: [io  0x0376]
[    0.248000] pci 0000:00:01.3: quirk: [io  0x0600-0x063f] claimed by PIIX4 ACPI
[    0.248000] pci 0000:00:01.3: quirk: [io  0x0700-0x070f] claimed by PIIX4 SMB
[    0.250000] ACPI: PCI Interrupt Link [LNKA] (IRQs 5 *10 11)
[    0.251000] ACPI: PCI Interrupt Link [LNKB] (IRQs 5 *10 11)
[    0.251000] ACPI: PCI Interrupt Link [LNKC] (IRQs 5 10 *11)
[    0.252000] ACPI: PCI Interrupt Link [LNKD] (IRQs 5 10 *11)
[    0.252000] ACPI: PCI Interrupt Link [LNKS] (IRQs *9)
[    0.254000] ACPI: Enabled 16 GPEs in block 00 to 0F
[    0.254000] vgaarb: loaded
[    0.254000] SCSI subsystem initialized
[    0.256000] ACPI: bus type USB registered
[    0.256000] usbcore: registered new interface driver usbfs
[    0.257000] usbcore: registered new interface driver hub
[    0.257000] usbcore: registered new device driver usb
[    0.258000] pps_core: LinuxPPS API ver. 1 registered
[    0.258000] pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo Giometti <giometti@linux.it>
[    0.259000] PTP clock support registered
[    0.261000] Advanced Linux Sound Architecture Driver Initialized.
[    0.261000] PCI: Using ACPI for IRQ routing
[    0.262000] NetLabel: Initializing
[    0.262000] NetLabel:  domain hash size = 128
[    0.262000] NetLabel:  protocols = UNLABELED CIPSOv4
[    0.263000] NetLabel:  unlabeled traffic allowed by default
[    0.263000] hpet0: at MMIO 0xfed00000, IRQs 2, 8, 0
[    0.264000] hpet0: 3 comparators, 64-bit 100.000000 MHz counter
[    0.269000] clocksource: Switched to clocksource hpet
[    0.277032] VFS: Disk quotas dquot_6.6.0
[    0.277276] VFS: Dquot-cache hash table entries: 512 (order 0, 4096 bytes)
[    0.277276] pnp: PnP ACPI init
[    0.279112] pnp: PnP ACPI: found 5 devices
[    0.286022] clocksource: acpi_pm: mask: 0xffffff max_cycles: 0xffffff, max_idle_ns: 2085701024 ns
[    0.286116] NET: Registered protocol family 2
[    0.286116] TCP established hash table entries: 16384 (order: 5, 131072 bytes)
[    0.287310] TCP bind hash table entries: 16384 (order: 7, 524288 bytes)
[    0.287310] TCP: Hash tables configured (established 16384 bind 16384)
[    0.288622] UDP hash table entries: 1024 (order: 4, 98304 bytes)
[    0.289225] UDP-Lite hash table entries: 1024 (order: 4, 98304 bytes)
[    0.289225] NET: Registered protocol family 1
[    0.291131] RPC: Registered named UNIX socket transport module.
[    0.291131] RPC: Registered udp transport module.
[    0.291399] RPC: Registered tcp transport module.
[    0.291399] RPC: Registered tcp NFSv4.1 backchannel transport module.
[    0.292367] pci 0000:00:00.0: Limiting direct PCI/PCI transfers
[    0.292367] pci 0000:00:01.0: PIIX3: Enabling Passive Release
[    0.293400] pci 0000:00:01.0: Activating ISA DMA hang workarounds
[    0.293400] Unpacking initramfs...
[    0.339036] Freeing initrd memory: 3056K (ffff88007fcd4000 - ffff88007ffd0000)
[    0.342028] Scanning for low memory corruption every 60 seconds
[    0.342044] rcu-torture:--- Start of test: nreaders=15 nfakewriters=4 stat_interval=60 verbose=1 test_no_idle_hz=1 shuffle_interval=3 stutter=5 irqreader=1 fqs_duration=0 fqs_holdoff=0 fqs_stutter=3 test_boost=1/0 test_boost_interval=7 test_boost_duration=4 shutdown_secs=0 stall_cpu=0 stall_cpu_holdoff=10 n_barrier_cbs=0 onoff_interval=1 onoff_holdoff=0
[    0.344754] rcu-torture: Creating rcu_torture_writer task
[    0.345314] rcu-torture: Creating rcu_torture_fakewriter task
[    0.345314] rcu-torture: rcu_torture_writer task started
[    0.346409] rcu-torture: Creating rcu_torture_fakewriter task
[    0.346409] rcu-torture: rcu_torture_fakewriter task started
[    0.347428] rcu-torture: Grace periods expedited from boot/sysfs for rcu,
[    0.347428] rcu-torture: Creating rcu_torture_fakewriter task
[    0.348084] rcu-torture: rcu_torture_fakewriter task started
[    0.348513] rcu-torture: Testing of dynamic grace-period expediting diabled.
[    0.349513] rcu-torture: Creating rcu_torture_fakewriter task
[    0.349513] rcu-torture: rcu_torture_fakewriter task started
[    0.349513] rcu-torture: Creating rcu_torture_reader task
[    0.349513] rcu-torture: rcu_torture_fakewriter task started
[    0.351030] rcu-torture: rcu_torture_reader task started
[    0.351040] rcu-torture: Creating rcu_torture_reader task
[    0.351040] rcu-torture: Creating rcu_torture_reader task
[    0.351040] rcu-torture: rcu_torture_reader task started
[    0.351040] rcu-torture: Creating rcu_torture_reader task
[    0.351040] rcu-torture: rcu_torture_reader task started
[    0.351040] rcu-torture: Creating rcu_torture_reader task
[    0.351040] rcu-torture: rcu_torture_reader task started
[    0.351040] rcu-torture: Creating rcu_torture_reader task
[    0.351040] rcu-torture: rcu_torture_reader task started
[    0.351040] rcu-torture: Creating rcu_torture_reader task
[    0.351040] rcu-torture: rcu_torture_reader task started
[    0.351040] rcu-torture: Creating rcu_torture_reader task
[    0.351040] rcu-torture: rcu_torture_reader task started
[    0.351040] rcu-torture: Creating rcu_torture_reader task
[    0.351040] rcu-torture: rcu_torture_reader task started
[    0.351040] rcu-torture: Creating rcu_torture_reader task
[    0.351040] rcu-torture: rcu_torture_reader task started
[    0.351040] rcu-torture: Creating rcu_torture_reader task
[    0.351040] rcu-torture: rcu_torture_reader task started
[    0.351040] rcu-torture: Creating rcu_torture_reader task
[    0.351040] rcu-torture: rcu_torture_reader task started
[    0.351040] rcu-torture: Creating rcu_torture_reader task
[    0.351040] rcu-torture: rcu_torture_reader task started
[    0.351040] rcu-torture: Creating rcu_torture_reader task
[    0.351040] rcu-torture: rcu_torture_reader task started
[    0.351053] rcu-torture: Creating rcu_torture_reader task
[    0.351097] rcu-torture: Creating rcu_torture_stats task
[    0.351097] rcu-torture: rcu_torture_reader task started
[    0.351163] rcu-torture: rcu_torture_reader task started
[    0.351162] rcu-torture: Creating torture_shuffle task
[    0.351162] rcu-torture: rcu_torture_stats task started
[    0.351162] rcu-torture: Creating torture_stutter task
[    0.351162] rcu-torture: torture_shuffle task started
[    0.351162] rcu-torture: Creating torture_onoff task
[    0.351162] rcu-torture: torture_stutter task started
[    0.351162] rcu-torture: Creating rcu_torture_cbflood task
[    0.351162] rcu-torture: torture_onoff task started
[    0.351162] rcu-torture:torture_onoff task: offlining 13
[    0.351163] rcu-torture: Creating rcu_torture_cbflood task
[    0.351163] rcu-torture: rcu_torture_cbflood task started
[    0.351163] rcu-torture: Creating rcu_torture_cbflood task
[    0.351163] rcu-torture: Creating rcu_torture_cbflood task
[    0.353035] rcu-torture: rcu_torture_cbflood task started
[    0.352049] rcu-torture: rcu_torture_cbflood task started
[    0.353035] rcu-torture: rcu_torture_cbflood task started
[    0.389053] rcu-torture:torture_onoff task: offlined 13
[    0.389141] futex hash table entries: 4096 (order: 6, 262144 bytes)
[    0.389141] audit: initializing netlink subsys (disabled)
[    0.389141] audit: type=2000 audit(1459346724.389:1): initialized
[    0.394035] NFS: Registering the id_resolver key type
[    0.394270] Key type id_resolver registered
[    0.394270] Key type id_legacy registered
[    0.397105] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 251)
[    0.397762] io scheduler noop registered
[    0.398252] io scheduler deadline registered
[    0.398252] io scheduler cfq registered (default)
[    0.400031] pci_hotplug: PCI Hot Plug PCI Core version: 0.5
[    0.400031] input: Power Button as /devices/LNXSYSTM:00/LNXPWRBN:00/input/input0
[    0.400530] ACPI: Power Button [PWRF]
[    0.402040] Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled
[    0.422759] 00:04: ttyS0 at I/O 0x3f8 (irq = 4, base_baud = 115200) is a 16550A
[    0.425041] Non-volatile memory driver v1.3
[    0.425041] Linux agpgart interface v0.103
[    0.425041] [drm] Initialized drm 1.1.0 20060810
[    0.431041] loop: module loaded
[    0.432226] scsi host0: ata_piix
[    0.432237] scsi host1: ata_piix
[    0.432237] ata1: PATA max MWDMA2 cmd 0x1f0 ctl 0x3f6 bmdma 0xc000 irq 14
[    0.433721] ata2: PATA max MWDMA2 cmd 0x170 ctl 0x376 bmdma 0xc008 irq 15
[    0.434358] e100: Intel(R) PRO/100 Network Driver, 3.5.24-k2-NAPI
[    0.435140] e100: Copyright(c) 1999-2006 Intel Corporation
[    0.435140] e1000: Intel(R) PRO/1000 Network Driver - version 7.3.21-k8-NAPI
[    0.436277] e1000: Copyright (c) 1999-2006 Intel Corporation.
[    0.436277] sky2: driver version 1.30
[    0.437178] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[    0.437178] ehci-pci: EHCI PCI platform driver
[    0.438346] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
[    0.438346] ohci-pci: OHCI PCI platform driver
[    0.439361] uhci_hcd: USB Universal Host Controller Interface driver
[    0.439361] usbcore: registered new interface driver usblp
[    0.440474] usbcore: registered new interface driver usb-storage
[    0.442029] i8042: PNP: PS/2 Controller [PNP0303:KBD,PNP0f13:MOU] at 0x60,0x64 irq 1,12
[    0.443023] serio: i8042 KBD port at 0x60,0x64 irq 1
[    0.443023] serio: i8042 AUX port at 0x60,0x64 irq 12
[    0.444065] mousedev: PS/2 mouse device common for all mice
[    0.444184] rtc_cmos 00:00: RTC can wake from S4
[    0.444184] rtc_cmos 00:00: rtc core: registered rtc_cmos as rtc0
[    0.445646] rtc_cmos 00:00: alarms up to one day, 114 bytes nvram, hpet irqs
[    0.446675] device-mapper: ioctl: 4.34.0-ioctl (2015-10-28) initialised: dm-devel@redhat.com
[    0.447659] hidraw: raw HID events driver (C) Jiri Kosina
[    0.448258] usbcore: registered new interface driver usbhid
[    0.448258] usbhid: USB HID core driver
[    0.450040] input: AT Translated Set 2 keyboard as /devices/platform/i8042/serio0/input/input1
[    0.451072] Netfilter messages via NETLINK v0.30.
[    0.451072] nf_conntrack version 0.5.0 (16384 buckets, 65536 max)
[    0.451072] ctnetlink v0.93: registering with nfnetlink.
[    0.466084] ip_tables: (C) 2000-2006 Netfilter Core Team
[    0.471062] Initializing XFRM netlink socket
[    0.471598] NET: Registered protocol family 10
[    0.473087] ip6_tables: (C) 2000-2006 Netfilter Core Team
[    0.490021] sit: IPv6 over IPv4 tunneling driver
[    0.491183] NET: Registered protocol family 17
[    0.492024] Key type dns_resolver registered
[    0.493114] microcode: CPU0 sig=0x206c2, pf=0x1, revision=0x1
[    0.495107] microcode: CPU1 sig=0x206c2, pf=0x1, revision=0x1
[    0.495168] microcode: CPU2 sig=0x206c2, pf=0x1, revision=0x1
[    0.495589] microcode: CPU3 sig=0x206c2, pf=0x1, revision=0x1
[    0.502194] microcode: CPU4 sig=0x206c2, pf=0x1, revision=0x1
[    0.503126] microcode: CPU5 sig=0x206c2, pf=0x1, revision=0x1
[    0.504091] microcode: CPU6 sig=0x206c2, pf=0x1, revision=0x1
[    0.504036] microcode: CPU7 sig=0x206c2, pf=0x1, revision=0x1
[    0.504053] microcode: CPU8 sig=0x206c2, pf=0x1, revision=0x1
[    0.505116] microcode: CPU9 sig=0x206c2, pf=0x1, revision=0x1
[    0.505061] microcode: CPU10 sig=0x206c2, pf=0x1, revision=0x1
[    0.506053] microcode: CPU11 sig=0x206c2, pf=0x1, revision=0x1
[    0.506026] microcode: CPU12 sig=0x206c2, pf=0x1, revision=0x1
[    0.508095] microcode: CPU14 sig=0x206c2, pf=0x1, revision=0x1
[    0.507139] microcode: CPU15 sig=0x206c2, pf=0x1, revision=0x1
[    0.509067] microcode: Microcode Update Driver: v2.01 <tigran@aivazian.fsnet.co.uk>, Peter Oruba
[    0.509329] registered taskstats version 1
[    0.511033]   Magic number: 8:234:82
[    0.511033] console [netcon0] enabled
[    0.511033] netconsole: network logging started
[    0.511254] ALSA device list:
[    0.511254]   No soundcards found.
[    0.588057] Freeing unused kernel memory: 1092K (ffffffff81f3c000 - ffffffff8204d000)
[    0.589129] Write protecting the kernel read-only data: 14336k
[    0.592046] Freeing unused kernel memory: 1296K (ffff8800018bc000 - ffff880001a00000)
[    0.594022] Freeing unused kernel memory: 396K (ffff880001d9d000 - ffff880001e00000)
:: running early hook [udev]
Warning: /lib/modules/4.5.0-rc1+/modules.devname not found - ignoring
[    0.605171] random: systemd-tmpfile urandom read with 2 bits of entropy available
[    0.606659] systemd-tmpfile (1176) used greatest stack depth: 13896 bytes left
starting version 228
:: running hook [udev]
:: Triggering uevents...
[    0.699039] systemd-udevd (1190) used greatest stack depth: 13888 bytes left
ERROR: device '' not found. Skipping fsck.
ERROR: Unable to find root device ''.
You are being dropped to a recovery shell
    Type 'exit' to try and continue booting
sh: can't access tty; job control turned off
[rootfs /]# [    1.057112] input: ImExPS/2 Generic Explorer Mouse as /devices/platform/i8042/serio1/input/input3
[    1.392056] rcu-torture:torture_onoff task: offlining 8
[    1.607043] hrtimer: interrupt took 5051140 ns
[    1.616058] smpboot: CPU 8 is now offline
[    1.663068] rcu-torture:torture_onoff task: offlined 8
[    2.663063] rcu-torture:torture_onoff task: offlining 2
[    3.017066] smpboot: CPU 2 is now offline
[    3.071046] rcu-torture:torture_onoff task: offlined 2
[    4.072035] rcu-torture:torture_onoff task: offlining 9
[    4.240047] smpboot: CPU 9 is now offline
[    4.295063] rcu-torture:torture_onoff task: offlined 9
[    5.297036] rcu-torture:torture_onoff task: offlining 12
[    5.399044] smpboot: CPU 12 is now offline
[    5.454051] rcu-torture:torture_onoff task: offlined 12
[    6.454036] rcu-torture:torture_onoff task: onlining 13
[    6.509046] smpboot: Booting Node 0 Processor 13 APIC 0xd
[    6.546026] microcode: CPU13 sig=0x206c2, pf=0x1, revision=0x1
[    6.546026] rcu-torture:torture_onoff task: onlined 13
[    7.546045] rcu-torture:torture_onoff task: offlining 11
[    7.602125] smpboot: CPU 11 is now offline
[    7.695044] rcu-torture:torture_onoff task: offlined 11
[    8.695045] rcu-torture:torture_onoff task: offlining 5
[    8.751103] smpboot: CPU 5 is now offline
[    8.808024] rcu-torture:torture_onoff task: offlined 5
[    9.807032] rcu-torture:torture_onoff task: onlining 12
[    9.861053] smpboot: Booting Node 0 Processor 12 APIC 0xc
[    9.905032] rcu-torture:torture_onoff task: onlined 12
[   10.905040] rcu-torture:torture_onoff task: offlining 14
[   10.912099] smpboot: CPU 14 is now offline
[   10.966050] rcu-torture:torture_onoff task: offlined 14
[   11.966038] rcu-torture:torture_onoff task: offlining 13
[   12.173064] smpboot: CPU 13 is now offline
[   12.173064] BUG: unable to handle kernel NULL pointer dereference at           (null)
[   12.174064] IP: [<ffffffff810b9452>] migrate_timer_list+0x32/0xc0
[   12.174064] PGD 0 
[   12.174064] Oops: 0002 [#1] PREEMPT SMP 
[   12.174064] Modules linked in:
[   12.174064] CPU: 1 PID: 795 Comm: torture_onoff Not tainted 4.5.0-rc1+ #14
[   12.174064] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.1-20160216_104851-anatol 04/01/2014
[   12.174064] task: ffff88007c651900 ti: ffff88007c660000 task.ti: ffff88007c660000
[   12.174064] RIP: 0010:[<ffffffff810b9452>]  [<ffffffff810b9452>] migrate_timer_list+0x32/0xc0
[   12.174064] RSP: 0018:ffff88007c663c98  EFLAGS: 00010086
[   12.174064] RAX: dead000000000200 RBX: ffff88007fa2cc00 RCX: 00000000000000af
[   12.174064] RDX: 0000000000000000 RSI: ffff88007fbad648 RDI: ffff88007fa2cc00
[   12.174064] RBP: ffff88007c663cc0 R08: 0000000000000000 R09: ffff88007fa2cc00
[   12.174064] R10: ffff88007c61be30 R11: 0000000000018f70 R12: ffff88007fbad648
[   12.174064] R13: ffff88007fa2cc00 R14: 0000000000000001 R15: ffff88007fbac420
[   12.174064] FS:  0000000000000000(0000) GS:ffff88007fa20000(0000) knlGS:0000000000000000
[   12.174064] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[   12.174064] CR2: 0000000000000000 CR3: 000000007b124000 CR4: 00000000000006e0
[   12.174064] Stack:
[   12.174064]  ffff88007fa2cc00 ffff88007fbad650 ffff88007fbada48 ffff88007fbad848
[   12.174064]  ffff88007fbad450 ffff88007c663d08 ffffffff810b95c4 ffff88007fbacc00
[   12.174064]  ffff88007fbad648 00000000fffffff0 ffffffff81e4e0c0 0000000000000007
[   12.174064] Call Trace:
[   12.174064]  [<ffffffff810b95c4>] timer_cpu_notify+0xe4/0x160
[   12.174064]  [<ffffffff81073ea5>] notifier_call_chain+0x45/0x70
[   12.174064]  [<ffffffff81073fc9>] __raw_notifier_call_chain+0x9/0x10
[   12.174064]  [<ffffffff8105759e>] cpu_notify_nofail+0x1e/0x30
[   12.174064]  [<ffffffff81057852>] _cpu_down+0x212/0x350
[   12.174064]  [<ffffffff810b3350>] ? __call_rcu.constprop.74+0x380/0x380
[   12.174064]  [<ffffffff810b33b0>] ? call_rcu_bh+0x20/0x20
[   12.174064]  [<ffffffff810a8950>] ? __rcu_read_unlock+0x50/0x50
[   12.174064]  [<ffffffff810a8950>] ? __rcu_read_unlock+0x50/0x50
[   12.174064]  [<ffffffff810579bf>] cpu_down+0x2f/0x50
[   12.174064]  [<ffffffff811266b5>] torture_onoff+0x115/0x380
[   12.174064]  [<ffffffff811265a0>] ? torture_kthread_stopping+0x70/0x70
[   12.174064]  [<ffffffff810732f6>] kthread+0xd6/0xf0
[   12.174064]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[   12.174064]  [<ffffffff818b499f>] ret_from_fork+0x3f/0x70
[   12.174064]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[   12.174064] Code: 56 41 55 41 54 53 48 8b 06 44 8b 77 40 48 85 c0 74 53 49 89 fd 49 89 f4 4d 8b 3c 24 66 66 66 66 90 49 8b 07 49 8b 57 08 48 85 c0 <48> 89 02 74 04 48 89 50 08 48 b8 00 02 00 00 00 00 ad de 4c 89 
[   12.174064] RIP  [<ffffffff810b9452>] migrate_timer_list+0x32/0xc0
[   12.174064]  RSP <ffff88007c663c98>
[   12.174064] CR2: 0000000000000000
[   12.174064] ---[ end trace 3ef597e7ab20460c ]---
[   12.174064] note: torture_onoff[795] exited with preempt_count 3
[   15.414020] BUG: spinlock lockup suspected on CPU#3, rcu_torture_fak/773
[   15.414020]  lock: 0xffff88007fa2cc00, .magic: dead4ead, .owner: torture_onoff/795, .owner_cpu: 1
[   15.414020] CPU: 3 PID: 773 Comm: rcu_torture_fak Tainted: G      D         4.5.0-rc1+ #14
[   15.414020] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.1-20160216_104851-anatol 04/01/2014
[   15.414020]  ffff88007fa2cc00 ffff88007c64bce8 ffffffff8132cd6c ffff88007c651900
[   15.414020]  ffff88007c64bd08 ffffffff81092fb3 ffff88007fa2cc00 0000000057288000
[   15.414020]  ffff88007c64bd38 ffffffff810930db 0000000000000286 ffff88007fa2cc00
[   15.414020] Call Trace:
[   15.414020]  [<ffffffff8132cd6c>] dump_stack+0x4e/0x82
[   15.414020]  [<ffffffff81092fb3>] spin_dump+0x73/0xc0
[   15.414020]  [<ffffffff810930db>] do_raw_spin_lock+0x9b/0x150
[   15.414020]  [<ffffffff818b401f>] _raw_spin_lock_irqsave+0x1f/0x30
[   15.414020]  [<ffffffff810b8faf>] lock_timer_base.isra.23+0x4f/0x70
[   15.414020]  [<ffffffff810b904b>] try_to_del_timer_sync+0x1b/0x60
[   15.414020]  [<ffffffff810b90d3>] del_timer_sync+0x43/0x50
[   15.414020]  [<ffffffff818b35e6>] schedule_timeout+0x116/0x230
[   15.414020]  [<ffffffff810b8dd0>] ? detach_if_pending+0xf0/0xf0
[   15.414020]  [<ffffffff810ac000>] ? sched_torture_read_unlock+0x30/0x30
[   15.414020]  [<ffffffff818b3759>] schedule_timeout_uninterruptible+0x19/0x20
[   15.414020]  [<ffffffff810ac087>] rcu_torture_fakewriter+0x87/0x160
[   15.414020]  [<ffffffff810732f6>] kthread+0xd6/0xf0
[   15.414020]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[   15.414020]  [<ffffffff818b499f>] ret_from_fork+0x3f/0x70
[   15.414020]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[   15.414020] Sending NMI to all CPUs:
[   15.414020] NMI backtrace for cpu 0
[   15.414020] CPU: 0 PID: 779 Comm: rcu_torture_rea Tainted: G      D         4.5.0-rc1+ #14
[   15.414020] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.1-20160216_104851-anatol 04/01/2014
[   15.414020] task: ffff88007c644b00 ti: ffff88007cab0000 task.ti: ffff88007cab0000
[   15.414020] RIP: 0010:[<ffffffff818af940>]  [<ffffffff818af940>] _cond_resched+0x0/0x20
[   15.414020] RSP: 0018:ffff88007cab3df0  EFLAGS: 00000202
[   15.414020] RAX: 0000000000000001 RBX: ffffffff81c9f0eb RCX: 0000000000000001
[   15.414020] RDX: 0000000080000000 RSI: 0000000000000286 RDI: ffffffff81c9f0eb
[   15.414020] RBP: ffff88007cab3e00 R08: ffff88007cab0000 R09: ffff88007fa0cc00
[   15.414020] R10: ffff88007cab3e30 R11: 0000000000000001 R12: 0000000000000000
[   15.414020] R13: 0000000392ee6980 R14: 0000000000000072 R15: ffffffff820d6e80
[   15.414020] FS:  0000000000000000(0000) GS:ffff88007fa00000(0000) knlGS:0000000000000000
[   15.414020] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[   15.414020] CR2: 00007ffd0da7e3bc CR3: 0000000001e0f000 CR4: 00000000000006f0
[   15.414020] Stack:
[   15.414020]  ffffffff81126479 0000000000000000 ffff88007cab3ea8 ffffffff810ad3ce
[   15.414020]  0000000000000000 0000000081a0a240 e24ff85eb6c56d81 00000000000023ff
[   15.414020]  dead000000000200 0000000000000000 00000000fffba817 ffffffff810ad590
[   15.414020] Call Trace:
[   15.414020]  [<ffffffff81126479>] ? stutter_wait+0x49/0xc0
[   15.414020]  [<ffffffff810ad3ce>] rcu_torture_reader+0x11e/0x2e0
[   15.414020]  [<ffffffff810ad590>] ? rcu_torture_reader+0x2e0/0x2e0
[   15.414020]  [<ffffffff810ad2b0>] ? rcutorture_trace_dump.part.7+0x20/0x20
[   15.414020]  [<ffffffff810732f6>] kthread+0xd6/0xf0
[   15.414020]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[   15.414020]  [<ffffffff818b499f>] ret_from_fork+0x3f/0x70
[   15.414020]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[   15.414020] Code: 75 7e a9 ff ff ff 7f 74 01 c3 9c 58 f6 c4 02 74 f8 55 48 89 e5 e8 a1 ff ff ff 5d c3 0f 1f 44 00 00 66 2e 0f 1f 84 00 00 00 00 00 <65> 8b 15 49 b4 75 7e 85 d2 74 03 31 c0 c3 55 48 89 e5 e8 79 ff 
[   12.315013] BUG: spinlock lockup suspected on CPU#7, rcu_torture_rea/791
[   12.315013]  lock: 0xffff88007fbacc00, .magic: dead4ead, .owner: torture_onoff/795, .owner_cpu: 1
[   12.315013] CPU: 7 PID: 791 Comm: rcu_torture_rea Tainted: G      D         4.5.0-rc1+ #14
[   12.315013] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.1-20160216_104851-anatol 04/01/2014
[   12.315013]  ffff88007fbacc00 ffff88007c60bd10 ffffffff8132cd6c ffff88007c651900
[   12.315013]  ffff88007c60bd30 ffffffff81092fb3 ffff88007fbacc00 0000000057288000
[   12.315013]  ffff88007c60bd60 ffffffff810930db 0000000000000286 ffff88007fbacc00
[   12.315013] Call Trace:
[   12.315013]  [<ffffffff8132cd6c>] dump_stack+0x4e/0x82
[   12.315013]  [<ffffffff81092fb3>] spin_dump+0x73/0xc0
[   12.315013]  [<ffffffff810930db>] do_raw_spin_lock+0x9b/0x150
[   12.315013]  [<ffffffff818b401f>] _raw_spin_lock_irqsave+0x1f/0x30
[   12.315013]  [<ffffffff810b8faf>] lock_timer_base.isra.23+0x4f/0x70
[   12.315013]  [<ffffffff810ba6fa>] mod_timer+0x6a/0x200
[   12.315013]  [<ffffffff810ad557>] rcu_torture_reader+0x2a7/0x2e0
[   12.315013]  [<ffffffff810ad590>] ? rcu_torture_reader+0x2e0/0x2e0
[   12.315013]  [<ffffffff810ad2b0>] ? rcutorture_trace_dump.part.7+0x20/0x20
[   12.315013]  [<ffffffff810732f6>] kthread+0xd6/0xf0
[   12.315013]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[   12.315013]  [<ffffffff818b499f>] ret_from_fork+0x3f/0x70
[   12.315013]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[   15.414020] NMI backtrace for cpu 1
[   15.414020] CPU: 1 PID: 795 Comm: torture_onoff Tainted: G      D         4.5.0-rc1+ #14
[   15.414020] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.1-20160216_104851-anatol 04/01/2014
[   15.414020] task: ffff88007c651900 ti: ffff88007c660000 task.ti: ffff88007c660000
[   15.414020] RIP: 0010:[<ffffffff813392d0>]  [<ffffffff813392d0>] delay_loop+0x0/0x30
[   15.414020] RSP: 0018:ffff88007fa23e68  EFLAGS: 00000002
[   15.414020] RAX: 0000000000000001 RBX: ffff88007fa2cc00 RCX: 0000000000208044
[   15.414020] RDX: 0000000000000000 RSI: ffffffff81ca0d44 RDI: 0000000000000001
[   15.414020] RBP: ffff88007fa23e70 R08: ffff88007fa2e140 R09: 000000000000000e
[   15.414020] R10: 000000000000022d R11: 0000000000000020 R12: 00000000546c6ab5
[   15.414020] R13: 0000000000000001 R14: 0000000057288000 R15: 0000000000000000
[   15.414020] FS:  0000000000000000(0000) GS:ffff88007fa20000(0000) knlGS:0000000000000000
[   15.414020] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[   15.414020] CR2: 0000000000000000 CR3: 000000007b124000 CR4: 00000000000006e0
[   15.414020] Stack:
[   15.414020]  ffffffff8133930a ffff88007fa23ea0 ffffffff810930c7 ffff88007fa2cc00
[   15.414020]  ffffffff81e080c8 0000000000000001 0000000000000001 ffff88007fa23eb8
[   15.414020]  ffffffff818b3ffb ffff88007fa2cc00 ffff88007fa23f20 ffffffff810b91b0
[   15.414020] Call Trace:
[   15.414020]  <IRQ> \x01d [<ffffffff8133930a>] ? __delay+0xa/0x10
[   15.414020]  [<ffffffff810930c7>] do_raw_spin_lock+0x87/0x150
[   15.414020]  [<ffffffff818b3ffb>] _raw_spin_lock_irq+0x1b/0x20
[   15.414020]  [<ffffffff810b91b0>] run_timer_softirq+0x40/0x2b0
[   15.414020]  [<ffffffff810c6ddd>] ? clockevents_program_event+0x7d/0x120
[   15.414020]  [<ffffffff8105b613>] __do_softirq+0xd3/0x280
[   15.414020]  [<ffffffff8105b8d2>] irq_exit+0x42/0x50
[   15.414020]  [<ffffffff8103de5d>] smp_apic_timer_interrupt+0x3d/0x50
[   15.414020]  [<ffffffff818b538f>] apic_timer_interrupt+0x7f/0x90
[   15.414020]  <EOI> \x01d [<ffffffff818b414f>] ? _raw_spin_unlock_irq+0xf/0x30
[   15.414020]  [<ffffffff818b4149>] ? _raw_spin_unlock_irq+0x9/0x30
[   15.414020]  [<ffffffff810d4da6>] acct_collect+0x166/0x1a0
[   15.414020]  [<ffffffff81058cd9>] do_exit+0x4f9/0xc00
[   15.414020]  [<ffffffff810087e4>] oops_end+0x84/0xb0
[   15.414020]  [<ffffffff8104a612>] no_context+0x102/0x330
[   15.414020]  [<ffffffff8104a8b5>] __bad_area_nosemaphore+0x75/0x1f0
[   15.414020]  [<ffffffff8104aa3e>] bad_area_nosemaphore+0xe/0x10
[   15.414020]  [<ffffffff8104ac95>] __do_page_fault+0x85/0x450
[   15.414020]  [<ffffffff8104b06c>] do_page_fault+0xc/0x10
[   15.414020]  [<ffffffff818b6422>] page_fault+0x22/0x30
[   15.414020]  [<ffffffff810b9452>] ? migrate_timer_list+0x32/0xc0
[   15.414020]  [<ffffffff810b9483>] ? migrate_timer_list+0x63/0xc0
[   15.414020]  [<ffffffff810b95c4>] timer_cpu_notify+0xe4/0x160
[   15.414020]  [<ffffffff81073ea5>] notifier_call_chain+0x45/0x70
[   15.414020]  [<ffffffff81073fc9>] __raw_notifier_call_chain+0x9/0x10
[   15.414020]  [<ffffffff8105759e>] cpu_notify_nofail+0x1e/0x30
[   15.414020]  [<ffffffff81057852>] _cpu_down+0x212/0x350
[   15.414020]  [<ffffffff810b3350>] ? __call_rcu.constprop.74+0x380/0x380
[   15.414020]  [<ffffffff810b33b0>] ? call_rcu_bh+0x20/0x20
[   15.414020]  [<ffffffff810a8950>] ? __rcu_read_unlock+0x50/0x50
[   15.414020]  [<ffffffff810a8950>] ? __rcu_read_unlock+0x50/0x50
[   15.414020]  [<ffffffff810579bf>] cpu_down+0x2f/0x50
[   15.414020]  [<ffffffff811266b5>] torture_onoff+0x115/0x380
[   15.414020]  [<ffffffff811265a0>] ? torture_kthread_stopping+0x70/0x70
[   15.414020]  [<ffffffff810732f6>] kthread+0xd6/0xf0
[   15.414020]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[   15.414020]  [<ffffffff818b499f>] ret_from_fork+0x3f/0x70
[   15.414020]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[   15.414020] Code: c3 66 2e 0f 1f 84 00 00 00 00 00 55 41 89 d2 48 89 e5 e8 54 fe ff ff 5d 44 01 d0 83 d0 00 c3 90 90 90 90 90 90 90 90 90 90 90 90 <55> 48 89 f8 48 89 e5 48 85 c0 74 19 eb 02 66 90 eb 0e 0f 1f 40 
[   15.414020] NMI backtrace for cpu 3
[   15.414020] CPU: 3 PID: 773 Comm: rcu_torture_fak Tainted: G      D         4.5.0-rc1+ #14
[   15.414020] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.1-20160216_104851-anatol 04/01/2014
[   15.414020] task: ffff88007c640000 ti: ffff88007c648000 task.ti: ffff88007c648000
[   15.414020] RIP: 0010:[<ffffffff8103ef7d>]  [<ffffffff8103ef7d>] default_send_IPI_mask_sequence_phys+0x9d/0xd0
[   15.414020] RSP: 0018:ffff88007c64bc68  EFLAGS: 00000046
[   15.414020] RAX: 0000000000000400 RBX: 000000000000a130 RCX: 0000000000000003
[   15.414020] RDX: 0000000000000003 RSI: 0000000000000010 RDI: 0000000000000300
[   15.414020] RBP: ffff88007c64bca0 R08: 0000000000000000 R09: 00000000000094db
[   15.414020] R10: ffff88007c64bf58 R11: 00000000000001f8 R12: ffffffff81f31740
[   15.414020] R13: 0000000000000400 R14: 0000000000000002 R15: 0000000000000003
[   15.414020] FS:  0000000000000000(0000) GS:ffff88007fa60000(0000) knlGS:0000000000000000
[   15.414020] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[   15.414020] CR2: 0000560af8460720 CR3: 0000000001e0f000 CR4: 00000000000006e0
[   15.414020] Stack:
[   15.414020]  0000000000000082 000000037c64bc78 000000000000ff40 0000000000000001
[   15.414020]  ffffffff8103fd20 0000000057288000 ffff88007c64bda0 ffff88007c64bcb0
[   15.414020]  ffffffff8103fd36 ffff88007c64bcf8 ffffffff81331299 ffffffff81008b50
[   15.414020] Call Trace:
[   15.414020]  [<ffffffff8103fd20>] ? irq_force_complete_move+0x20/0x20
[   15.414020]  [<ffffffff8103fd36>] nmi_raise_cpu_backtrace+0x16/0x20
[   15.414020]  [<ffffffff81331299>] nmi_trigger_all_cpu_backtrace+0x259/0x270
[   15.414020]  [<ffffffff81008b50>] ? show_stack+0x20/0x50
[   15.414020]  [<ffffffff8103fd74>] arch_trigger_all_cpu_backtrace+0x14/0x20
[   15.414020]  [<ffffffff810930e5>] do_raw_spin_lock+0xa5/0x150
[   15.414020]  [<ffffffff818b401f>] _raw_spin_lock_irqsave+0x1f/0x30
[   15.414020]  [<ffffffff810b8faf>] lock_timer_base.isra.23+0x4f/0x70
[   15.414020]  [<ffffffff810b904b>] try_to_del_timer_sync+0x1b/0x60
[   15.414020]  [<ffffffff810b90d3>] del_timer_sync+0x43/0x50
[   15.414020]  [<ffffffff818b35e6>] schedule_timeout+0x116/0x230
[   15.414020]  [<ffffffff810b8dd0>] ? detach_if_pending+0xf0/0xf0
[   15.414020]  [<ffffffff810ac000>] ? sched_torture_read_unlock+0x30/0x30
[   15.414020]  [<ffffffff818b3759>] schedule_timeout_uninterruptible+0x19/0x20
[   15.414020]  [<ffffffff810ac087>] rcu_torture_fakewriter+0x87/0x160
[   15.414020]  [<ffffffff810732f6>] kthread+0xd6/0xf0
[   15.414020]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[   15.414020]  [<ffffffff818b499f>] ret_from_fork+0x3f/0x70
[   15.414020]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[   15.414020] Code: 90 8b 0c 25 00 c3 5f ff 80 e5 10 75 f2 89 d0 c1 e0 18 89 04 25 10 c3 5f ff 41 83 fe 02 44 89 e8 41 0f 45 c6 89 04 25 00 c3 5f ff <eb> 91 48 8b 05 32 09 ef 00 89 55 d4 ff 90 18 01 00 00 8b 55 d4 
[   15.414020] NMI backtrace for cpu 4
[   15.414020] CPU: 4 PID: 0 Comm: swapper/4 Tainted: G      D         4.5.0-rc1+ #14
[   15.414020] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.1-20160216_104851-anatol 04/01/2014
[   15.414020] task: ffff88007cc63e80 ti: ffff88007cc7c000 task.ti: ffff88007cc7c000
[   15.414020] RIP: 0010:[<ffffffff8100f303>]  [<ffffffff8100f303>] default_idle+0x13/0xd0
[   15.414020] RSP: 0018:ffff88007cc7fec0  EFLAGS: 00000202
[   15.414020] RAX: 0000000000000004 RBX: ffff88007cc80000 RCX: 0000000000000000
[   15.414020] RDX: 0000000000000000 RSI: ffffffff81ca0d44 RDI: ffffffff81cbdfe7
[   15.414020] RBP: ffff88007cc7fed0 R08: 0000000000000000 R09: 0000000000000000
[   15.414020] R10: 0000000000000400 R11: 0000000000000002 R12: 0000000000000000
[   15.414020] R13: 0000000000000000 R14: ffff88007cc7c000 R15: ffff88007cc7c000
[   15.414020] FS:  0000000000000000(0000) GS:ffff88007fa80000(0000) knlGS:0000000000000000
[   15.414020] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[   15.414020] CR2: 0000560af8460720 CR3: 0000000001e0f000 CR4: 00000000000006e0
[   15.414020] Stack:
[   15.414020]  ffff88007cc80000 0000000000000000 ffff88007cc7fee0 ffffffff8100fafa
[   15.414020]  ffff88007cc7fef0 ffffffff8108fd65 ffff88007cc7ff30 ffffffff8108fff7
[   15.414020]  ffff88007cc80000 0000000000000004 0000000000000000 0000000000000000
[   15.414020] Call Trace:
[   15.414020]  [<ffffffff8100fafa>] arch_cpu_idle+0xa/0x10
[   15.414020]  [<ffffffff8108fd65>] default_idle_call+0x25/0x30
[   15.414020]  [<ffffffff8108fff7>] cpu_startup_entry+0x287/0x2e0
[   15.414020]  [<ffffffff8103bf29>] start_secondary+0xf9/0x100
[   15.414020] Code: 0f 1f 84 00 00 00 00 00 55 89 ff 48 89 e5 f0 48 0f ab 3e 5d c3 0f 1f 00 55 48 89 e5 41 54 53 e8 c4 8d 33 00 66 66 66 66 90 fb f4 <e8> b8 8d 33 00 41 89 c4 66 66 66 66 90 5b 41 5c 5d c3 41 89 c4 
[   15.414020] NMI backtrace for cpu 6
[   15.414020] CPU: 6 PID: 775 Comm: rcu_torture_fak Tainted: G      D         4.5.0-rc1+ #14
[   15.414020] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.1-20160216_104851-anatol 04/01/2014
[   15.414020] task: ffff88007c641900 ti: ffff88007c610000 task.ti: ffff88007c610000
[   15.414020] RIP: 0010:[<ffffffff813392d0>]  [<ffffffff813392d0>] delay_loop+0x0/0x30
[   15.414020] RSP: 0018:ffff88007c613d00  EFLAGS: 00000006
[   15.414020] RAX: 0000000000000001 RBX: ffff88007fa2cc00 RCX: 0000000000000001
[   15.414020] RDX: 0000000000000000 RSI: ffff88007c613da0 RDI: 0000000000000001
[   15.414020] RBP: ffff88007c613d08 R08: ffff88007c610000 R09: 0000000000000002
[   15.414020] R10: 0000000000000000 R11: 0000000000000b6e R12: 000000002ec4668b
[   15.414020] R13: 0000000000000001 R14: 0000000057288000 R15: ffff88007c613da0
[   15.414020] FS:  0000000000000000(0000) GS:ffff88007fac0000(0000) knlGS:0000000000000000
[   15.414020] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[   15.414020] CR2: 0000560af8460720 CR3: 0000000001e0f000 CR4: 00000000000006e0
[   15.414020] Stack:
[   15.414020]  ffffffff8133930a ffff88007c613d38 ffffffff810930c7 0000000000000286
[   15.414020]  ffff88007fa2cc00 ffff88007fa2cc00 000000000000cc00 ffff88007c613d58
[   15.414020]  ffffffff818b401f 0000000000000001 ffff88007c613e18 ffff88007c613d90
[   15.414020] Call Trace:
[   15.414020]  [<ffffffff8133930a>] ? __delay+0xa/0x10
[   15.414020]  [<ffffffff810930c7>] do_raw_spin_lock+0x87/0x150
[   15.414020]  [<ffffffff818b401f>] _raw_spin_lock_irqsave+0x1f/0x30
[   15.414020]  [<ffffffff810b8faf>] lock_timer_base.isra.23+0x4f/0x70
[   15.414020]  [<ffffffff810b904b>] try_to_del_timer_sync+0x1b/0x60
[   15.414020]  [<ffffffff810b90d3>] del_timer_sync+0x43/0x50
[   15.414020]  [<ffffffff818b35e6>] schedule_timeout+0x116/0x230
[   15.414020]  [<ffffffff810b8dd0>] ? detach_if_pending+0xf0/0xf0
[   15.414020]  [<ffffffff810ac000>] ? sched_torture_read_unlock+0x30/0x30
[   15.414020]  [<ffffffff818b3759>] schedule_timeout_uninterruptible+0x19/0x20
[   15.414020]  [<ffffffff810ac087>] rcu_torture_fakewriter+0x87/0x160
[   15.414020]  [<ffffffff810732f6>] kthread+0xd6/0xf0
[   15.414020]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[   15.414020]  [<ffffffff818b499f>] ret_from_fork+0x3f/0x70
[   15.414020]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[   15.414020] Code: c3 66 2e 0f 1f 84 00 00 00 00 00 55 41 89 d2 48 89 e5 e8 54 fe ff ff 5d 44 01 d0 83 d0 00 c3 90 90 90 90 90 90 90 90 90 90 90 90 <55> 48 89 f8 48 89 e5 48 85 c0 74 19 eb 02 66 90 eb 0e 0f 1f 40 
[   15.414020] NMI backtrace for cpu 7
[   15.414020] CPU: 7 PID: 791 Comm: rcu_torture_rea Tainted: G      D         4.5.0-rc1+ #14
[   15.414020] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.1-20160216_104851-anatol 04/01/2014
[   15.414020] task: ffff88007c5fe400 ti: ffff88007c608000 task.ti: ffff88007c608000
[   15.414020] RIP: 0010:[<ffffffff810930aa>]  [<ffffffff810930aa>] do_raw_spin_lock+0x6a/0x150
[   15.414020] RSP: 0018:ffff88007c60bd40  EFLAGS: 00000012
[   15.414020] RAX: ffffffffffffffff RBX: ffff88007fbacc00 RCX: 0000000000000001
[   15.414020] RDX: 0000000000000000 RSI: ffff88007c60bdd0 RDI: 0000000000000001
[   15.414020] RBP: ffff88007c60bd60 R08: ffffffff81e496f8 R09: ffff88007fbacc00
[   15.414020] R10: ffff88007c60be30 R11: 0000000000094c00 R12: 0000000056fb33d6
[   15.414020] R13: 0000000000000001 R14: 0000000057288000 R15: ffff88007c60bdd0
[   15.414020] FS:  0000000000000000(0000) GS:ffff88007fae0000(0000) knlGS:0000000000000000
[   15.414020] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[   15.414020] CR2: 0000560af8460720 CR3: 0000000001e0f000 CR4: 00000000000006e0
[   15.414020] Stack:
[   15.414020]  0000000000000286 ffff88007fbacc00 ffff88007fbacc00 000000000000cc00
[   15.414020]  ffff88007c60bd80 ffffffff818b401f 000000000000000d ffff88007c60be58
[   15.414020]  ffff88007c60bdb8 ffffffff810b8faf ffff88007c60be30 00000000fffb9c3c
[   15.414020] Call Trace:
[   15.414020]  [<ffffffff818b401f>] _raw_spin_lock_irqsave+0x1f/0x30
[   15.414020]  [<ffffffff810b8faf>] lock_timer_base.isra.23+0x4f/0x70
[   15.414020]  [<ffffffff810ba6fa>] mod_timer+0x6a/0x200
[   15.414020]  [<ffffffff810ad557>] rcu_torture_reader+0x2a7/0x2e0
[   15.414020]  [<ffffffff810ad590>] ? rcu_torture_reader+0x2e0/0x2e0
[   15.414020]  [<ffffffff810ad2b0>] ? rcutorture_trace_dump.part.7+0x20/0x20
[   15.414020]  [<ffffffff810732f6>] kthread+0xd6/0xf0
[   15.414020]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[   15.414020]  [<ffffffff818b499f>] ret_from_fork+0x3f/0x70
[   15.414020]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[   15.414020] Code: 03 85 c0 75 0d ba 01 00 00 00 f0 0f b1 13 85 c0 74 67 4c 69 35 b4 0f d8 00 e8 03 00 00 45 31 e4 41 bd 01 00 00 00 4d 85 f6 74 22 <8b> 03 85 c0 75 09 f0 44 0f b1 2b 85 c0 74 3f bf 01 00 00 00 49 
[   15.414020] NMI backtrace for cpu 10
[   15.414020] CPU: 10 PID: 785 Comm: rcu_torture_rea Tainted: G      D         4.5.0-rc1+ #14
[   15.414020] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.1-20160216_104851-anatol 04/01/2014
[   15.414020] task: ffff88007c5f9900 ti: ffff88007c510000 task.ti: ffff88007c510000
[   15.414020] RIP: 0010:[<ffffffff81126479>]  [<ffffffff81126479>] stutter_wait+0x49/0xc0
[   15.414020] RSP: 0018:ffff88007c513df8  EFLAGS: 00000246
[   15.414020] RAX: 0000000000000000 RBX: ffffffff81c9f0eb RCX: 0000000000000001
[   15.414020] RDX: 0000000080000000 RSI: 0000000000000286 RDI: ffffffff81c9f0eb
[   15.414020] RBP: ffff88007c513e00 R08: ffff88007c510000 R09: ffff88007fb4cc00
[   15.414020] R10: ffff88007c513e30 R11: 0000000000000001 R12: 0000000000000000
[   15.414020] R13: 0000000392b16080 R14: 0000000000000072 R15: ffffffff820d6e80
[   15.414020] FS:  0000000000000000(0000) GS:ffff88007fb40000(0000) knlGS:0000000000000000
[   15.414020] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[   15.414020] CR2: 0000560af8460720 CR3: 0000000001e0f000 CR4: 00000000000006e0
[   15.414020] Stack:
[   15.414020]  0000000000000000 ffff88007c513ea8 ffffffff810ad3ce 0000000000000000
[   15.414020]  0000000081a0a240 3d2f7d49a663713f 000000000000160d dead000000000200
[   15.414020]  0000000000000000 00000000fffba813 ffffffff810ad590 0000000000000000
[   15.414020] Call Trace:
[   15.414020]  [<ffffffff810ad3ce>] rcu_torture_reader+0x11e/0x2e0
[   15.414020]  [<ffffffff810ad590>] ? rcu_torture_reader+0x2e0/0x2e0
[   15.414020]  [<ffffffff810ad2b0>] ? rcutorture_trace_dump.part.7+0x20/0x20
[   15.414020]  [<ffffffff810732f6>] kthread+0xd6/0xf0
[   15.414020]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[   15.414020]  [<ffffffff818b499f>] ret_from_fork+0x3f/0x70
[   15.414020]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[   15.414020] Code: 0e af fd 00 48 85 c0 74 66 8b 00 85 c0 75 60 8b 05 61 ae fd 00 85 c0 74 26 8b 05 57 ae fd 00 83 f8 01 75 07 eb 35 e8 c7 94 78 00 <8b> 05 45 ae fd 00 85 c0 75 f1 48 89 df e8 65 ff ff ff eb b4 bf 
[   15.414020] NMI backtrace for cpu 12
[   15.414020] CPU: 12 PID: 0 Comm: swapper/12 Tainted: G      D         4.5.0-rc1+ #14
[   15.414020] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.1-20160216_104851-anatol 04/01/2014
[   15.414020] task: ffff88007cc9a580 ti: ffff88007ccac000 task.ti: ffff88007ccac000
[   15.414020] RIP: 0010:[<ffffffff8100f303>]  [<ffffffff8100f303>] default_idle+0x13/0xd0
[   15.414020] RSP: 0018:ffff88007ccafec0  EFLAGS: 00000202
[   15.414020] RAX: 000000000000000c RBX: ffff88007ccb0000 RCX: 0000000000000000
[   15.414020] RDX: 0000000000000000 RSI: ffffffff81ca0d44 RDI: ffffffff81cbdfe7
[   15.414020] RBP: ffff88007ccafed0 R08: 0000000000000000 R09: 0000000000000000
[   15.414020] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
[   15.414020] R13: 0000000000000000 R14: ffff88007ccac000 R15: ffff88007ccac000
[   15.414020] FS:  0000000000000000(0000) GS:ffff88007fb80000(0000) knlGS:0000000000000000
[   15.414020] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[   15.414020] CR2: 0000000000000000 CR3: 0000000001e0f000 CR4: 00000000000006e0
[   15.414020] Stack:
[   15.414020]  ffff88007ccb0000 0000000000000000 ffff88007ccafee0 ffffffff8100fafa
[   15.414020]  ffff88007ccafef0 ffffffff8108fd65 ffff88007ccaff30 ffffffff8108fff7
[   15.414020]  ffff88007ccb0000 000000000000000c 0000000000000000 0000000000000000
[   15.414020] Call Trace:
[   15.414020]  [<ffffffff8100fafa>] arch_cpu_idle+0xa/0x10
[   15.414020]  [<ffffffff8108fd65>] default_idle_call+0x25/0x30
[   15.414020]  [<ffffffff8108fff7>] cpu_startup_entry+0x287/0x2e0
[   15.414020]  [<ffffffff8103bf29>] start_secondary+0xf9/0x100
[   15.414020] Code: 0f 1f 84 00 00 00 00 00 55 89 ff 48 89 e5 f0 48 0f ab 3e 5d c3 0f 1f 00 55 48 89 e5 41 54 53 e8 c4 8d 33 00 66 66 66 66 90 fb f4 <e8> b8 8d 33 00 41 89 c4 66 66 66 66 90 5b 41 5c 5d c3 41 89 c4 
[   15.414020] NMI backtrace for cpu 15
[   15.414020] CPU: 15 PID: 788 Comm: rcu_torture_rea Tainted: G      D         4.5.0-rc1+ #14
[   15.414020] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.1-20160216_104851-anatol 04/01/2014
[   15.414020] task: ffff88007c5fbe80 ti: ffff88007c51c000 task.ti: ffff88007c51c000
[   15.414020] RIP: 0010:[<ffffffff818af940>]  [<ffffffff818af940>] _cond_resched+0x0/0x20
[   15.414020] RSP: 0018:ffff88007c51fdf0  EFLAGS: 00000202
[   15.414020] RAX: 0000000000000001 RBX: ffffffff81c9f0eb RCX: 0000000000000001
[   15.414020] RDX: 0000000080000000 RSI: ffffffff81d29759 RDI: ffffffff81c9f0eb
[   15.414020] RBP: ffff88007c51fe00 R08: ffff88007c51c000 R09: ffff88007fb8cc00
[   15.414020] R10: ffff88007c51fe30 R11: 0000000000000001 R12: 0000000000000000
[   15.414020] R13: 0000000392ee6980 R14: 0000000000000072 R15: ffffffff820d6e80
[   15.414020] FS:  0000000000000000(0000) GS:ffff88007fbe0000(0000) knlGS:0000000000000000
[   15.414020] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[   15.414020] CR2: 00007fa3445ac000 CR3: 000000007b2ba000 CR4: 00000000000006e0
[   15.414020] Stack:
[   15.414020]  ffffffff81126479 0000000000000000 ffff88007c51fea8 ffffffff810ad3ce
[   15.414020]  0000000000000000 0000000081a0a240 036fde59d7641143 0000000000001385
[   15.414020]  dead000000000200 0000000000000000 00000000fffba817 ffffffff810ad590
[   15.414020] Call Trace:
[   15.414020]  [<ffffffff81126479>] ? stutter_wait+0x49/0xc0
[   15.414020]  [<ffffffff810ad3ce>] rcu_torture_reader+0x11e/0x2e0
[   15.414020]  [<ffffffff810ad590>] ? rcu_torture_reader+0x2e0/0x2e0
[   15.414020]  [<ffffffff810ad2b0>] ? rcutorture_trace_dump.part.7+0x20/0x20
[   15.414020]  [<ffffffff810732f6>] kthread+0xd6/0xf0
[   15.414020]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[   15.414020]  [<ffffffff818b499f>] ret_from_fork+0x3f/0x70
[   15.414020]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[   15.414020] Code: 75 7e a9 ff ff ff 7f 74 01 c3 9c 58 f6 c4 02 74 f8 55 48 89 e5 e8 a1 ff ff ff 5d c3 0f 1f 44 00 00 66 2e 0f 1f 84 00 00 00 00 00 <65> 8b 15 49 b4 75 7e 85 d2 74 03 31 c0 c3 55 48 89 e5 e8 79 ff 
[   16.616031] BUG: spinlock lockup suspected on CPU#1, torture_onoff/795
[   16.616031]  lock: 0xffff88007fa2cc00, .magic: dead4ead, .owner: torture_onoff/795, .owner_cpu: 1
[   16.616031] CPU: 1 PID: 795 Comm: torture_onoff Tainted: G      D         4.5.0-rc1+ #14
[   16.616031] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.1-20160216_104851-anatol 04/01/2014
[   16.616031]  ffff88007fa2cc00 ffff88007fa23e50 ffffffff8132cd6c ffff88007c651900
[   16.616031]  ffff88007fa23e70 ffffffff81092fb3 ffff88007fa2cc00 0000000057288000
[   16.616031]  ffff88007fa23ea0 ffffffff810930db ffff88007fa2cc00 ffffffff81e080c8
[   16.616031] Call Trace:
[   16.616031]  <IRQ>  [<ffffffff8132cd6c>] dump_stack+0x4e/0x82
[   16.616031]  [<ffffffff81092fb3>] spin_dump+0x73/0xc0
[   16.616031]  [<ffffffff810930db>] do_raw_spin_lock+0x9b/0x150
[   16.616031]  [<ffffffff818b3ffb>] _raw_spin_lock_irq+0x1b/0x20
[   16.616031]  [<ffffffff810b91b0>] run_timer_softirq+0x40/0x2b0
[   16.616031]  [<ffffffff810c6ddd>] ? clockevents_program_event+0x7d/0x120
[   16.616031]  [<ffffffff8105b613>] __do_softirq+0xd3/0x280
[   16.616031]  [<ffffffff8105b8d2>] irq_exit+0x42/0x50
[   16.616031]  [<ffffffff8103de5d>] smp_apic_timer_interrupt+0x3d/0x50
[   16.616031]  [<ffffffff818b538f>] apic_timer_interrupt+0x7f/0x90
[   16.616031]  <EOI>  [<ffffffff818b414f>] ? _raw_spin_unlock_irq+0xf/0x30
[   16.616031]  [<ffffffff818b4149>] ? _raw_spin_unlock_irq+0x9/0x30
[   16.616031]  [<ffffffff810d4da6>] acct_collect+0x166/0x1a0
[   16.616031]  [<ffffffff81058cd9>] do_exit+0x4f9/0xc00
[   16.616031]  [<ffffffff810087e4>] oops_end+0x84/0xb0
[   16.616031]  [<ffffffff8104a612>] no_context+0x102/0x330
[   16.616031]  [<ffffffff8104a8b5>] __bad_area_nosemaphore+0x75/0x1f0
[   16.616031]  [<ffffffff8104aa3e>] bad_area_nosemaphore+0xe/0x10
[   16.616031]  [<ffffffff8104ac95>] __do_page_fault+0x85/0x450
[   16.616031]  [<ffffffff8104b06c>] do_page_fault+0xc/0x10
[   16.616031]  [<ffffffff818b6422>] page_fault+0x22/0x30
[   16.616031]  [<ffffffff810b9452>] ? migrate_timer_list+0x32/0xc0
[   16.616031]  [<ffffffff810b9483>] ? migrate_timer_list+0x63/0xc0
[   16.616031]  [<ffffffff810b95c4>] timer_cpu_notify+0xe4/0x160
[   16.616031]  [<ffffffff81073ea5>] notifier_call_chain+0x45/0x70
[   16.616031]  [<ffffffff81073fc9>] __raw_notifier_call_chain+0x9/0x10
[   16.616031]  [<ffffffff8105759e>] cpu_notify_nofail+0x1e/0x30
[   16.616031]  [<ffffffff81057852>] _cpu_down+0x212/0x350
[   16.616031]  [<ffffffff810b3350>] ? __call_rcu.constprop.74+0x380/0x380
[   16.616031]  [<ffffffff810b33b0>] ? call_rcu_bh+0x20/0x20
[   16.616031]  [<ffffffff810a8950>] ? __rcu_read_unlock+0x50/0x50
[   16.616031]  [<ffffffff810a8950>] ? __rcu_read_unlock+0x50/0x50
[   16.616031]  [<ffffffff810579bf>] cpu_down+0x2f/0x50
[   16.616031]  [<ffffffff811266b5>] torture_onoff+0x115/0x380
[   16.616031]  [<ffffffff811265a0>] ? torture_kthread_stopping+0x70/0x70
[   16.616031]  [<ffffffff810732f6>] kthread+0xd6/0xf0
[   16.616031]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[   16.616031]  [<ffffffff818b499f>] ret_from_fork+0x3f/0x70
[   16.616031]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[   16.616031] Sending NMI to all CPUs:
[   16.616031] NMI backtrace for cpu 0
[   16.616031] CPU: 0 PID: 779 Comm: rcu_torture_rea Tainted: G      D         4.5.0-rc1+ #14
[   16.616031] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.1-20160216_104851-anatol 04/01/2014
[   16.616031] task: ffff88007c644b00 ti: ffff88007cab0000 task.ti: ffff88007cab0000
[   16.616031] RIP: 0010:[<ffffffff818af940>]  [<ffffffff818af940>] _cond_resched+0x0/0x20
[   16.616031] RSP: 0018:ffff88007cab3df0  EFLAGS: 00000202
[   16.616031] RAX: 0000000000000001 RBX: ffffffff81c9f0eb RCX: 0000000000000001
[   16.616031] RDX: 0000000080000000 RSI: 0000000000000286 RDI: ffffffff81c9f0eb
[   16.616031] RBP: ffff88007cab3e00 R08: ffff88007cab0000 R09: ffff88007fa0cc00
[   16.616031] R10: ffff88007cab3e30 R11: 0000000000000001 R12: 0000000000000000
[   16.616031] R13: 0000000392ee6980 R14: 0000000000000072 R15: ffffffff820d6e80
[   16.616031] FS:  0000000000000000(0000) GS:ffff88007fa00000(0000) knlGS:0000000000000000
[   16.616031] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[   16.616031] CR2: 00007ffd0da7e3bc CR3: 0000000001e0f000 CR4: 00000000000006f0
[   16.616031] Stack:
[   16.616031]  ffffffff81126479 0000000000000000 ffff88007cab3ea8 ffffffff810ad3ce
[   16.616031]  0000000000000000 0000000081a0a240 e24ff85eb6c56d81 00000000000023ff
[   16.616031]  dead000000000200 0000000000000000 00000000fffba817 ffffffff810ad590
[   16.616031] Call Trace:
[   16.616031]  [<ffffffff81126479>] ? stutter_wait+0x49/0xc0
[   16.616031]  [<ffffffff810ad3ce>] rcu_torture_reader+0x11e/0x2e0
[   16.616031]  [<ffffffff810ad590>] ? rcu_torture_reader+0x2e0/0x2e0
[   16.616031]  [<ffffffff810ad2b0>] ? rcutorture_trace_dump.part.7+0x20/0x20
[   16.616031]  [<ffffffff810732f6>] kthread+0xd6/0xf0
[   16.616031]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[   16.616031]  [<ffffffff818b499f>] ret_from_fork+0x3f/0x70
[   16.616031]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[   16.616031] Code: 75 7e a9 ff ff ff 7f 74 01 c3 9c 58 f6 c4 02 74 f8 55 48 89 e5 e8 a1 ff ff ff 5d c3 0f 1f 44 00 00 66 2e 0f 1f 84 00 00 00 00 00 <65> 8b 15 49 b4 75 7e 85 d2 74 03 31 c0 c3 55 48 89 e5 e8 79 ff 
[   16.616031] NMI backtrace for cpu 1
[   16.616031] CPU: 1 PID: 795 Comm: torture_onoff Tainted: G      D         4.5.0-rc1+ #14
[   16.616031] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.1-20160216_104851-anatol 04/01/2014
[   16.616031] task: ffff88007c651900 ti: ffff88007c660000 task.ti: ffff88007c660000
[   16.616031] RIP: 0010:[<ffffffff8103ef7d>]  [<ffffffff8103ef7d>] default_send_IPI_mask_sequence_phys+0x9d/0xd0
[   16.616031] RSP: 0018:ffff88007fa23dd0  EFLAGS: 00000046
[   16.616031] RAX: 0000000000000400 RBX: 000000000000a130 RCX: 0000000000000001
[   16.616031] RDX: 0000000000000001 RSI: 0000000000000010 RDI: 0000000000000300
[   16.616031] RBP: ffff88007fa23e08 R08: 0000000000000000 R09: 00000000000094db
[   16.616031] R10: ffff88007c663f58 R11: 0000000000000362 R12: ffffffff81f31740
[   16.616031] R13: 0000000000000400 R14: 0000000000000002 R15: 0000000000000001
[   16.616031] FS:  0000000000000000(0000) GS:ffff88007fa20000(0000) knlGS:0000000000000000
[   16.616031] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[   16.616031] CR2: 0000000000000000 CR3: 000000007b124000 CR4: 00000000000006e0
[   16.616031] Stack:
[   16.616031]  0000000000000082 000000017fa23de0 000000000000ff40 0000000000000001
[   16.616031]  ffffffff8103fd20 0000000057288000 0000000000000000 ffff88007fa23e18
[   16.616031]  ffffffff8103fd36 ffff88007fa23e60 ffffffff81331299 ffffffff81008b50
[   16.616031] Call Trace:
[   16.616031]  <IRQ> \x01d [<ffffffff8103fd20>] ? irq_force_complete_move+0x20/0x20
[   16.616031]  [<ffffffff8103fd36>] nmi_raise_cpu_backtrace+0x16/0x20
[   16.616031]  [<ffffffff81331299>] nmi_trigger_all_cpu_backtrace+0x259/0x270
[   16.616031]  [<ffffffff81008b50>] ? show_stack+0x20/0x50
[   16.616031]  [<ffffffff8103fd74>] arch_trigger_all_cpu_backtrace+0x14/0x20
[   16.616031]  [<ffffffff810930e5>] do_raw_spin_lock+0xa5/0x150
[   16.616031]  [<ffffffff818b3ffb>] _raw_spin_lock_irq+0x1b/0x20
[   16.616031]  [<ffffffff810b91b0>] run_timer_softirq+0x40/0x2b0
[   16.616031]  [<ffffffff810c6ddd>] ? clockevents_program_event+0x7d/0x120
[   16.616031]  [<ffffffff8105b613>] __do_softirq+0xd3/0x280
[   16.616031]  [<ffffffff8105b8d2>] irq_exit+0x42/0x50
[   16.616031]  [<ffffffff8103de5d>] smp_apic_timer_interrupt+0x3d/0x50
[   16.616031]  [<ffffffff818b538f>] apic_timer_interrupt+0x7f/0x90
[   16.616031]  <EOI> \x01d [<ffffffff818b414f>] ? _raw_spin_unlock_irq+0xf/0x30
[   16.616031]  [<ffffffff818b4149>] ? _raw_spin_unlock_irq+0x9/0x30
[   16.616031]  [<ffffffff810d4da6>] acct_collect+0x166/0x1a0
[   16.616031]  [<ffffffff81058cd9>] do_exit+0x4f9/0xc00
[   16.616031]  [<ffffffff810087e4>] oops_end+0x84/0xb0
[   16.616031]  [<ffffffff8104a612>] no_context+0x102/0x330
[   16.616031]  [<ffffffff8104a8b5>] __bad_area_nosemaphore+0x75/0x1f0
[   16.616031]  [<ffffffff8104aa3e>] bad_area_nosemaphore+0xe/0x10
[   16.616031]  [<ffffffff8104ac95>] __do_page_fault+0x85/0x450
[   16.616031]  [<ffffffff8104b06c>] do_page_fault+0xc/0x10
[   16.616031]  [<ffffffff818b6422>] page_fault+0x22/0x30
[   16.616031]  [<ffffffff810b9452>] ? migrate_timer_list+0x32/0xc0
[   16.616031]  [<ffffffff810b9483>] ? migrate_timer_list+0x63/0xc0
[   16.616031]  [<ffffffff810b95c4>] timer_cpu_notify+0xe4/0x160
[   16.616031]  [<ffffffff81073ea5>] notifier_call_chain+0x45/0x70
[   16.616031]  [<ffffffff81073fc9>] __raw_notifier_call_chain+0x9/0x10
[   16.616031]  [<ffffffff8105759e>] cpu_notify_nofail+0x1e/0x30
[   16.616031]  [<ffffffff81057852>] _cpu_down+0x212/0x350
[   16.616031]  [<ffffffff810b3350>] ? __call_rcu.constprop.74+0x380/0x380
[   16.616031]  [<ffffffff810b33b0>] ? call_rcu_bh+0x20/0x20
[   16.616031]  [<ffffffff810a8950>] ? __rcu_read_unlock+0x50/0x50
[   16.616031]  [<ffffffff810a8950>] ? __rcu_read_unlock+0x50/0x50
[   16.616031]  [<ffffffff810579bf>] cpu_down+0x2f/0x50
[   16.616031]  [<ffffffff811266b5>] torture_onoff+0x115/0x380
[   16.616031]  [<ffffffff811265a0>] ? torture_kthread_stopping+0x70/0x70
[   16.616031]  [<ffffffff810732f6>] kthread+0xd6/0xf0
[   16.616031]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[   16.616031]  [<ffffffff818b499f>] ret_from_fork+0x3f/0x70
[   16.616031]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[   16.616031] Code: 90 8b 0c 25 00 c3 5f ff 80 e5 10 75 f2 89 d0 c1 e0 18 89 04 25 10 c3 5f ff 41 83 fe 02 44 89 e8 41 0f 45 c6 89 04 25 00 c3 5f ff <eb> 91 48 8b 05 32 09 ef 00 89 55 d4 ff 90 18 01 00 00 8b 55 d4 
[   16.616031] NMI backtrace for cpu 3
[   16.616031] CPU: 3 PID: 773 Comm: rcu_torture_fak Tainted: G      D         4.5.0-rc1+ #14
[   16.616031] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.1-20160216_104851-anatol 04/01/2014
[   16.616031] task: ffff88007c640000 ti: ffff88007c648000 task.ti: ffff88007c648000
[   16.616031] RIP: 0010:[<ffffffff810920af>]  [<ffffffff810920af>] queued_spin_lock_slowpath+0x16f/0x1a0
[   16.616031] RSP: 0018:ffff88007c64bcf0  EFLAGS: 00000002
[   16.616031] RAX: 0000000000000101 RBX: ffff88007fa2cc00 RCX: 0000000000000001
[   16.616031] RDX: 0000000000000101 RSI: 0000000000000001 RDI: 0000000000000101
[   16.616031] RBP: ffff88007c64bd08 R08: 0000000000000716 R09: 0000000000000332
[   16.616031] R10: ffff88007c64bf58 R11: 0000000000000332 R12: 0000000057288000
[   16.616031] R13: 0000000000000001 R14: 0000000057288000 R15: ffff88007c64bda0
[   16.616031] FS:  0000000000000000(0000) GS:ffff88007fa60000(0000) knlGS:0000000000000000
[   16.616031] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[   16.616031] CR2: 0000560af8460720 CR3: 0000000001e0f000 CR4: 00000000000006e0
[   16.616031] Stack:
[   16.616031]  ffff88007fa2cc00 0000000057288000 0000000000000001 ffff88007c64bd38
[   16.616031]  ffffffff81093185 0000000000000286 ffff88007fa2cc00 ffff88007fa2cc00
[   16.616031]  000000000000cc00 ffff88007c64bd58 ffffffff818b401f 0000000000000001
[   16.616031] Call Trace:
[   16.616031]  [<ffffffff81093185>] do_raw_spin_lock+0x145/0x150
[   16.616031]  [<ffffffff818b401f>] _raw_spin_lock_irqsave+0x1f/0x30
[   16.616031]  [<ffffffff810b8faf>] lock_timer_base.isra.23+0x4f/0x70
[   16.616031]  [<ffffffff810b904b>] try_to_del_timer_sync+0x1b/0x60
[   16.616031]  [<ffffffff810b90d3>] del_timer_sync+0x43/0x50
[   16.616031]  [<ffffffff818b35e6>] schedule_timeout+0x116/0x230
[   16.616031]  [<ffffffff810b8dd0>] ? detach_if_pending+0xf0/0xf0
[   16.616031]  [<ffffffff810ac000>] ? sched_torture_read_unlock+0x30/0x30
[   16.616031]  [<ffffffff818b3759>] schedule_timeout_uninterruptible+0x19/0x20
[   16.616031]  [<ffffffff810ac087>] rcu_torture_fakewriter+0x87/0x160
[   16.616031]  [<ffffffff810732f6>] kthread+0xd6/0xf0
[   16.616031]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[   16.616031]  [<ffffffff818b499f>] ret_from_fork+0x3f/0x70
[   16.616031]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[   16.616031] Code: c2 89 d0 66 31 c0 39 c7 74 e7 4d 85 c0 c6 03 01 74 30 41 c7 40 08 01 00 00 00 e9 4e ff ff ff 83 fa 01 75 07 e9 4b ff ff ff f3 90 <8b> 03 84 c0 75 f8 b8 01 00 00 00 66 89 03 5b 41 5c 41 5d 5d c3 
[   16.616031] NMI backtrace for cpu 4
[   16.616031] CPU: 4 PID: 0 Comm: swapper/4 Tainted: G      D         4.5.0-rc1+ #14
[   16.616031] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.1-20160216_104851-anatol 04/01/2014
[   16.616031] task: ffff88007cc63e80 ti: ffff88007cc7c000 task.ti: ffff88007cc7c000
[   16.616031] RIP: 0010:[<ffffffff8100f303>]  [<ffffffff8100f303>] default_idle+0x13/0xd0
[   16.616031] RSP: 0018:ffff88007cc7fec0  EFLAGS: 00000202
[   16.616031] RAX: 0000000000000004 RBX: ffff88007cc80000 RCX: 0000000000000000
[   16.616031] RDX: 0000000000000000 RSI: ffffffff81ca0d44 RDI: ffffffff81cbdfe7
[   16.616031] RBP: ffff88007cc7fed0 R08: 0000000000000000 R09: 0000000000000000
[   16.616031] R10: 0000000000000000 R11: 0000000000000002 R12: 0000000000000000
[   16.616031] R13: 0000000000000000 R14: ffff88007cc7c000 R15: ffff88007cc7c000
[   16.616031] FS:  0000000000000000(0000) GS:ffff88007fa80000(0000) knlGS:0000000000000000
[   16.616031] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[   16.616031] CR2: 0000560af8460720 CR3: 0000000001e0f000 CR4: 00000000000006e0
[   16.616031] Stack:
[   16.616031]  ffff88007cc80000 0000000000000000 ffff88007cc7fee0 ffffffff8100fafa
[   16.616031]  ffff88007cc7fef0 ffffffff8108fd65 ffff88007cc7ff30 ffffffff8108fff7
[   16.616031]  ffff88007cc80000 0000000000000004 0000000000000000 0000000000000000
[   16.616031] Call Trace:
[   16.616031]  [<ffffffff8100fafa>] arch_cpu_idle+0xa/0x10
[   16.616031]  [<ffffffff8108fd65>] default_idle_call+0x25/0x30
[   16.616031]  [<ffffffff8108fff7>] cpu_startup_entry+0x287/0x2e0
[   16.616031]  [<ffffffff8103bf29>] start_secondary+0xf9/0x100
[   16.616031] Code: 0f 1f 84 00 00 00 00 00 55 89 ff 48 89 e5 f0 48 0f ab 3e 5d c3 0f 1f 00 55 48 89 e5 41 54 53 e8 c4 8d 33 00 66 66 66 66 90 fb f4 <e8> b8 8d 33 00 41 89 c4 66 66 66 66 90 5b 41 5c 5d c3 41 89 c4 
[   16.616031] NMI backtrace for cpu 6
[   16.616031] CPU: 6 PID: 775 Comm: rcu_torture_fak Tainted: G      D         4.5.0-rc1+ #14
[   16.616031] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.1-20160216_104851-anatol 04/01/2014
[   16.616031] task: ffff88007c641900 ti: ffff88007c610000 task.ti: ffff88007c610000
[   16.616031] RIP: 0010:[<ffffffff81339300>]  [<ffffffff81339300>] __delay+0x0/0x10
[   16.616031] RSP: 0018:ffff88007c613d10  EFLAGS: 00000002
[   16.616031] RAX: 0000000000000101 RBX: ffff88007fa2cc00 RCX: 0000000000000001
[   16.616031] RDX: 0000000000000000 RSI: ffff88007c613da0 RDI: 0000000000000001
[   16.616031] RBP: ffff88007c613d38 R08: ffff88007c610000 R09: 0000000000000002
[   16.616031] R10: 0000000000000000 R11: 0000000000000b6e R12: 0000000030beeb3b
[   16.616031] R13: 0000000000000001 R14: 0000000057288000 R15: ffff88007c613da0
[   16.616031] FS:  0000000000000000(0000) GS:ffff88007fac0000(0000) knlGS:0000000000000000
[   16.616031] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[   16.616031] CR2: 0000560af8460720 CR3: 0000000001e0f000 CR4: 00000000000006e0
[   16.616031] Stack:
[   16.616031]  ffffffff810930c7 0000000000000286 ffff88007fa2cc00 ffff88007fa2cc00
[   16.616031]  000000000000cc00 ffff88007c613d58 ffffffff818b401f 0000000000000001
[   16.616031]  ffff88007c613e18 ffff88007c613d90 ffffffff810b8faf ffff88007c613df0
[   16.616031] Call Trace:
[   16.616031]  [<ffffffff810930c7>] ? do_raw_spin_lock+0x87/0x150
[   16.616031]  [<ffffffff818b401f>] _raw_spin_lock_irqsave+0x1f/0x30
[   16.616031]  [<ffffffff810b8faf>] lock_timer_base.isra.23+0x4f/0x70
[   16.616031]  [<ffffffff810b904b>] try_to_del_timer_sync+0x1b/0x60
[   16.616031]  [<ffffffff810b90d3>] del_timer_sync+0x43/0x50
[   16.616031]  [<ffffffff818b35e6>] schedule_timeout+0x116/0x230
[   16.616031]  [<ffffffff810b8dd0>] ? detach_if_pending+0xf0/0xf0
[   16.616031]  [<ffffffff810ac000>] ? sched_torture_read_unlock+0x30/0x30
[   16.616031]  [<ffffffff818b3759>] schedule_timeout_uninterruptible+0x19/0x20
[   16.616031]  [<ffffffff810ac087>] rcu_torture_fakewriter+0x87/0x160
[   16.616031]  [<ffffffff810732f6>] kthread+0xd6/0xf0
[   16.616031]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[   16.616031]  [<ffffffff818b499f>] ret_from_fork+0x3f/0x70
[   16.616031]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[   16.616031] Code: 89 e5 48 85 c0 74 19 eb 02 66 90 eb 0e 0f 1f 40 00 66 2e 0f 1f 84 00 00 00 00 00 48 ff c8 75 fb 48 ff c8 5d c3 66 0f 1f 44 00 00 <55> 48 89 e5 ff 15 2e 2b b6 00 5d c3 0f 1f 40 00 55 48 8d 04 bd 
[   16.616031] NMI backtrace for cpu 7
[   16.616031] CPU: 7 PID: 791 Comm: rcu_torture_rea Tainted: G      D         4.5.0-rc1+ #14
[   16.616031] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.1-20160216_104851-anatol 04/01/2014
[   16.616031] task: ffff88007c5fe400 ti: ffff88007c608000 task.ti: ffff88007c608000
[   16.616031] RIP: 0010:[<ffffffff810920af>]  [<ffffffff810920af>] queued_spin_lock_slowpath+0x16f/0x1a0
[   16.616031] RSP: 0018:ffff88007c60bd18  EFLAGS: 00000002
[   16.616031] RAX: 0000000000000101 RBX: ffff88007fbacc00 RCX: 0000000000000001
[   16.616031] RDX: 0000000000000101 RSI: 0000000000000001 RDI: 0000000000000101
[   16.616031] RBP: ffff88007c60bd30 R08: 0000000000000000 R09: 0000000000000035
[   16.616031] R10: ffff88007c60bf58 R11: 0000000000036a30 R12: 0000000057288000
[   16.616031] R13: 0000000000000001 R14: 0000000057288000 R15: ffff88007c60bdd0
[   16.616031] FS:  0000000000000000(0000) GS:ffff88007fae0000(0000) knlGS:0000000000000000
[   16.616031] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[   16.616031] CR2: 0000560af8460720 CR3: 0000000001e0f000 CR4: 00000000000006e0
[   16.616031] Stack:
[   16.616031]  ffff88007fbacc00 0000000057288000 0000000000000001 ffff88007c60bd60
[   16.616031]  ffffffff81093185 0000000000000286 ffff88007fbacc00 ffff88007fbacc00
[   16.616031]  000000000000cc00 ffff88007c60bd80 ffffffff818b401f 000000000000000d
[   16.616031] Call Trace:
[   16.616031]  [<ffffffff81093185>] do_raw_spin_lock+0x145/0x150
[   16.616031]  [<ffffffff818b401f>] _raw_spin_lock_irqsave+0x1f/0x30
[   16.616031]  [<ffffffff810b8faf>] lock_timer_base.isra.23+0x4f/0x70
[   16.616031]  [<ffffffff810ba6fa>] mod_timer+0x6a/0x200
[   16.616031]  [<ffffffff810ad557>] rcu_torture_reader+0x2a7/0x2e0
[   16.616031]  [<ffffffff810ad590>] ? rcu_torture_reader+0x2e0/0x2e0
[   16.616031]  [<ffffffff810ad2b0>] ? rcutorture_trace_dump.part.7+0x20/0x20
[   16.616031]  [<ffffffff810732f6>] kthread+0xd6/0xf0
[   16.616031]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[   16.616031]  [<ffffffff818b499f>] ret_from_fork+0x3f/0x70
[   16.616031]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[   16.616031] Code: c2 89 d0 66 31 c0 39 c7 74 e7 4d 85 c0 c6 03 01 74 30 41 c7 40 08 01 00 00 00 e9 4e ff ff ff 83 fa 01 75 07 e9 4b ff ff ff f3 90 <8b> 03 84 c0 75 f8 b8 01 00 00 00 66 89 03 5b 41 5c 41 5d 5d c3 
[   16.616031] NMI backtrace for cpu 10
[   16.616031] CPU: 10 PID: 785 Comm: rcu_torture_rea Tainted: G      D         4.5.0-rc1+ #14
[   16.616031] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.1-20160216_104851-anatol 04/01/2014
[   16.616031] task: ffff88007c5f9900 ti: ffff88007c510000 task.ti: ffff88007c510000
[   16.616031] RIP: 0010:[<ffffffff818af94b>]  [<ffffffff818af94b>] _cond_resched+0xb/0x20
[   16.616031] RSP: 0018:ffff88007c513df0  EFLAGS: 00000286
[   16.616031] RAX: 0000000000000001 RBX: ffffffff81c9f0eb RCX: 0000000000000001
[   16.616031] RDX: 0000000080000000 RSI: 0000000000000286 RDI: ffffffff81c9f0eb
[   16.616031] RBP: ffff88007c513e00 R08: ffff88007c510000 R09: ffff88007fb4cc00
[   16.616031] R10: ffff88007c513e30 R11: 0000000000000001 R12: 0000000000000000
[   16.616031] R13: 0000000392b16080 R14: 0000000000000072 R15: ffffffff820d6e80
[   16.616031] FS:  0000000000000000(0000) GS:ffff88007fb40000(0000) knlGS:0000000000000000
[   16.616031] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[   16.616031] CR2: 0000560af8460720 CR3: 0000000001e0f000 CR4: 00000000000006e0
[   16.616031] Stack:
[   16.616031]  ffffffff81126479 0000000000000000 ffff88007c513ea8 ffffffff810ad3ce
[   16.616031]  0000000000000000 0000000081a0a240 3d2f7d49a663713f 000000000000160d
[   16.616031]  dead000000000200 0000000000000000 00000000fffba813 ffffffff810ad590
[   16.616031] Call Trace:
[   16.616031]  [<ffffffff81126479>] ? stutter_wait+0x49/0xc0
[   16.616031]  [<ffffffff810ad3ce>] rcu_torture_reader+0x11e/0x2e0
[   16.616031]  [<ffffffff810ad590>] ? rcu_torture_reader+0x2e0/0x2e0
[   16.616031]  [<ffffffff810ad2b0>] ? rcutorture_trace_dump.part.7+0x20/0x20
[   16.616031]  [<ffffffff810732f6>] kthread+0xd6/0xf0
[   16.616031]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[   16.616031]  [<ffffffff818b499f>] ret_from_fork+0x3f/0x70
[   16.616031]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[   16.616031] Code: 58 f6 c4 02 74 f8 55 48 89 e5 e8 a1 ff ff ff 5d c3 0f 1f 44 00 00 66 2e 0f 1f 84 00 00 00 00 00 65 8b 15 49 b4 75 7e 85 d2 74 03 <31> c0 c3 55 48 89 e5 e8 79 ff ff ff b8 01 00 00 00 5d c3 66 90 
[   16.616031] NMI backtrace for cpu 12
[   16.616031] CPU: 12 PID: 0 Comm: swapper/12 Tainted: G      D         4.5.0-rc1+ #14
[   16.616031] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.1-20160216_104851-anatol 04/01/2014
[   16.616031] task: ffff88007cc9a580 ti: ffff88007ccac000 task.ti: ffff88007ccac000
[   16.616031] RIP: 0010:[<ffffffff8100f303>]  [<ffffffff8100f303>] default_idle+0x13/0xd0
[   16.616031] RSP: 0018:ffff88007ccafec0  EFLAGS: 00000202
[   16.616031] RAX: 000000000000000c RBX: ffff88007ccb0000 RCX: 0000000000000000
[   16.616031] RDX: 0000000000000000 RSI: ffffffff81ca0d44 RDI: ffffffff81cbdfe7
[   16.616031] RBP: ffff88007ccafed0 R08: 0000000000000000 R09: 0000000000000000
[   16.616031] R10: 0000000000000400 R11: 0000000000000002 R12: 0000000000000000
[   16.616031] R13: 0000000000000000 R14: ffff88007ccac000 R15: ffff88007ccac000
[   16.616031] FS:  0000000000000000(0000) GS:ffff88007fb80000(0000) knlGS:0000000000000000
[   16.616031] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[   16.616031] CR2: 0000000000000000 CR3: 0000000001e0f000 CR4: 00000000000006e0
[   16.616031] Stack:
[   16.616031]  ffff88007ccb0000 0000000000000000 ffff88007ccafee0 ffffffff8100fafa
[   16.616031]  ffff88007ccafef0 ffffffff8108fd65 ffff88007ccaff30 ffffffff8108fff7
[   16.616031]  ffff88007ccb0000 000000000000000c 0000000000000000 0000000000000000
[   16.616031] Call Trace:
[   16.616031]  [<ffffffff8100fafa>] arch_cpu_idle+0xa/0x10
[   16.616031]  [<ffffffff8108fd65>] default_idle_call+0x25/0x30
[   16.616031]  [<ffffffff8108fff7>] cpu_startup_entry+0x287/0x2e0
[   16.616031]  [<ffffffff8103bf29>] start_secondary+0xf9/0x100
[   16.616031] Code: 0f 1f 84 00 00 00 00 00 55 89 ff 48 89 e5 f0 48 0f ab 3e 5d c3 0f 1f 00 55 48 89 e5 41 54 53 e8 c4 8d 33 00 66 66 66 66 90 fb f4 <e8> b8 8d 33 00 41 89 c4 66 66 66 66 90 5b 41 5c 5d c3 41 89 c4 
[   16.616031] NMI backtrace for cpu 15
[   16.616031] CPU: 15 PID: 788 Comm: rcu_torture_rea Tainted: G      D         4.5.0-rc1+ #14
[   16.616031] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.1-20160216_104851-anatol 04/01/2014
[   16.616031] task: ffff88007c5fbe80 ti: ffff88007c51c000 task.ti: ffff88007c51c000
[   16.616031] RIP: 0010:[<ffffffff81126479>]  [<ffffffff81126479>] stutter_wait+0x49/0xc0
[   16.616031] RSP: 0018:ffff88007c51fdf8  EFLAGS: 00000246
[   16.616031] RAX: 0000000000000000 RBX: ffffffff81c9f0eb RCX: 0000000000000001
[   16.616031] RDX: 0000000080000000 RSI: ffffffff81d29759 RDI: ffffffff81c9f0eb
[   16.616031] RBP: ffff88007c51fe00 R08: ffff88007c51c000 R09: ffff88007fb8cc00
[   16.616031] R10: ffff88007c51fe30 R11: 0000000000000001 R12: 0000000000000000
[   16.616031] R13: 0000000392ee6980 R14: 0000000000000072 R15: ffffffff820d6e80
[   16.616031] FS:  0000000000000000(0000) GS:ffff88007fbe0000(0000) knlGS:0000000000000000
[   16.616031] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[   16.616031] CR2: 00007fa3445ac000 CR3: 000000007b2ba000 CR4: 00000000000006e0
[   16.616031] Stack:
[   16.616031]  0000000000000000 ffff88007c51fea8 ffffffff810ad3ce 0000000000000000
[   16.616031]  0000000081a0a240 036fde59d7641143 0000000000001385 dead000000000200
[   16.616031]  0000000000000000 00000000fffba817 ffffffff810ad590 0000000000000000
[   16.616031] Call Trace:
[   16.616031]  [<ffffffff810ad3ce>] rcu_torture_reader+0x11e/0x2e0
[   16.616031]  [<ffffffff810ad590>] ? rcu_torture_reader+0x2e0/0x2e0
[   16.616031]  [<ffffffff810ad2b0>] ? rcutorture_trace_dump.part.7+0x20/0x20
[   16.616031]  [<ffffffff810732f6>] kthread+0xd6/0xf0
[   16.616031]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[   16.616031]  [<ffffffff818b499f>] ret_from_fork+0x3f/0x70
[   16.616031]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[   16.616031] Code: 0e af fd 00 48 85 c0 74 66 8b 00 85 c0 75 60 8b 05 61 ae fd 00 85 c0 74 26 8b 05 57 ae fd 00 83 f8 01 75 07 eb 35 e8 c7 94 78 00 <8b> 05 45 ae fd 00 85 c0 75 f1 48 89 df e8 65 ff ff ff eb b4 bf 
[   15.356027] BUG: spinlock lockup suspected on CPU#6, rcu_torture_fak/775
[   15.356027]  lock: 0xffff88007fa2cc00, .magic: dead4ead, .owner: torture_onoff/795, .owner_cpu: 1
[   15.356027] CPU: 6 PID: 775 Comm: rcu_torture_fak Tainted: G      D         4.5.0-rc1+ #14
[   15.356027] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.1-20160216_104851-anatol 04/01/2014
[   15.356027]  ffff88007fa2cc00 ffff88007c613ce8 ffffffff8132cd6c ffff88007c651900
[   15.356027]  ffff88007c613d08 ffffffff81092fb3 ffff88007fa2cc00 0000000057288000
[   15.356027]  ffff88007c613d38 ffffffff810930db 0000000000000286 ffff88007fa2cc00
[   15.356027] Call Trace:
[   15.356027]  [<ffffffff8132cd6c>] dump_stack+0x4e/0x82
[   15.356027]  [<ffffffff81092fb3>] spin_dump+0x73/0xc0
[   15.356027]  [<ffffffff810930db>] do_raw_spin_lock+0x9b/0x150
[   15.356027]  [<ffffffff818b401f>] _raw_spin_lock_irqsave+0x1f/0x30
[   15.356027]  [<ffffffff810b8faf>] lock_timer_base.isra.23+0x4f/0x70
[   15.356027]  [<ffffffff810b904b>] try_to_del_timer_sync+0x1b/0x60
[   15.356027]  [<ffffffff810b90d3>] del_timer_sync+0x43/0x50
[   15.356027]  [<ffffffff818b35e6>] schedule_timeout+0x116/0x230
[   15.356027]  [<ffffffff810b8dd0>] ? detach_if_pending+0xf0/0xf0
[   15.356027]  [<ffffffff810ac000>] ? sched_torture_read_unlock+0x30/0x30
[   15.356027]  [<ffffffff818b3759>] schedule_timeout_uninterruptible+0x19/0x20
[   15.356027]  [<ffffffff810ac087>] rcu_torture_fakewriter+0x87/0x160
[   15.356027]  [<ffffffff810732f6>] kthread+0xd6/0xf0
[   15.356027]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[   15.356027]  [<ffffffff818b499f>] ret_from_fork+0x3f/0x70
[   15.356027]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[   15.356027] Sending NMI to all CPUs:
[   15.356027] NMI backtrace for cpu 0
[   15.356027] CPU: 0 PID: 779 Comm: rcu_torture_rea Tainted: G      D         4.5.0-rc1+ #14
[   15.356027] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.1-20160216_104851-anatol 04/01/2014
[   15.356027] task: ffff88007c644b00 ti: ffff88007cab0000 task.ti: ffff88007cab0000
[   15.356027] RIP: 0010:[<ffffffff81045ea1>]  [<ffffffff81045ea1>] read_hpet+0x11/0x20
[   15.356027] RSP: 0018:ffff88007fa03ee0  EFLAGS: 00000046
[   15.356027] RAX: 000000008e223293 RBX: 000000055ae82600 RCX: ffff88007fa0dde8
[   15.356027] RDX: ffff88007fa0dda8 RSI: ffff88007fa0dd68 RDI: ffffffff81e2b020
[   15.356027] RBP: ffff88007fa03ee0 R08: ffff88007cab0000 R09: ffff88007fa0cc00
[   15.356027] R10: ffff88007cab3e30 R11: 0000000000000001 R12: 0000000000000000
[   15.356027] R13: ffff88007fa0dd68 R14: ffff88007fa0dcb0 R15: 000000000000b436
[   15.356027] FS:  0000000000000000(0000) GS:ffff88007fa00000(0000) knlGS:0000000000000000
[   15.356027] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[   15.356027] CR2: 00007ffd0da7e3bc CR3: 0000000001e0f000 CR4: 00000000000006f0
[   15.356027] Stack:
[   15.356027]  ffff88007fa03f28 ffffffff810c1ca7 ffff88007fa0dde8 ffff88007fa0dda8
[   15.356027]  0000000000000003 ffff88007fa0dcb0 ffff88007fa0dc80 ffff88007fa0dda8
[   15.356027]  ffff88007fa0dde8 ffff88007fa03f78 ffffffff810bb925 0000000000000072
[   15.356027] Call Trace:
[   15.356027]  <IRQ> \x01d [<ffffffff810c1ca7>] ktime_get_update_offsets_now+0x47/0x100
[   15.356027]  [<ffffffff810bb925>] hrtimer_interrupt+0x85/0x1a0
[   15.356027]  [<ffffffff8103d381>] local_apic_timer_interrupt+0x31/0x50
[   15.356027]  [<ffffffff8103de58>] smp_apic_timer_interrupt+0x38/0x50
[   15.356027]  [<ffffffff818b538f>] apic_timer_interrupt+0x7f/0x90
[   15.356027]  <EOI> \x01d [<ffffffff813392f3>] ? delay_loop+0x23/0x30
[   15.356027]  [<ffffffff81339337>] __const_udelay+0x27/0x30
[   15.356027]  [<ffffffff810add86>] rcu_read_delay+0x36/0xb0
[   15.356027]  [<ffffffff810ad458>] rcu_torture_reader+0x1a8/0x2e0
[   15.356027]  [<ffffffff810ad590>] ? rcu_torture_reader+0x2e0/0x2e0
[   15.356027]  [<ffffffff810ad2b0>] ? rcutorture_trace_dump.part.7+0x20/0x20
[   15.356027]  [<ffffffff810732f6>] kthread+0xd6/0xf0
[   15.356027]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[   15.356027]  [<ffffffff818b499f>] ret_from_fork+0x3f/0x70
[   15.356027]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[   15.356027] Code: 00 29 c7 ba 00 00 00 00 b8 c2 ff ff ff 83 c7 80 0f 4d c2 5d c3 0f 1f 44 00 00 55 48 8b 05 40 7c 04 01 48 89 e5 8b 80 f0 00 00 00 <89> c0 5d c3 90 66 2e 0f 1f 84 00 00 00 00 00 80 3d 8a 7b 04 01 
[   15.356027] NMI backtrace for cpu 1
[   15.356027] CPU: 1 PID: 795 Comm: torture_onoff Tainted: G      D         4.5.0-rc1+ #14
[   15.356027] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.1-20160216_104851-anatol 04/01/2014
[   15.356027] task: ffff88007c651900 ti: ffff88007c660000 task.ti: ffff88007c660000
[   15.356027] RIP: 0010:[<ffffffff81092067>]  [<ffffffff81092067>] queued_spin_lock_slowpath+0x127/0x1a0
[   15.356027] RSP: 0018:ffff88007fa23e58  EFLAGS: 00000002
[   15.356027] RAX: 0000000000000000 RBX: ffff88007fa2cc00 RCX: ffff88007fa35e80
[   15.356027] RDX: 0000000000080101 RSI: ffffffff81ca0d44 RDI: 0000000000080000
[   15.356027] RBP: ffff88007fa23e70 R08: 0000000000000000 R09: 0000000000000486
[   15.356027] R10: ffff88007c663f58 R11: 0000000000000486 R12: 0000000000000000
[   15.356027] R13: ffff88007fa35e80 R14: 0000000057288000 R15: 0000000000000000
[   15.356027] FS:  0000000000000000(0000) GS:ffff88007fa20000(0000) knlGS:0000000000000000
[   15.356027] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[   15.356027] CR2: 0000000000000000 CR3: 000000007b124000 CR4: 00000000000006e0
[   15.356027] Stack:
[   15.356027]  ffff88007fa2cc00 0000000057288000 0000000000000001 ffff88007fa23ea0
[   15.356027]  ffffffff81093185 ffff88007fa2cc00 ffffffff81e080c8 0000000000000001
[   15.356027]  0000000000000001 ffff88007fa23eb8 ffffffff818b3ffb ffff88007fa2cc00
[   15.356027] Call Trace:
[   15.356027]  <IRQ> \x01d [<ffffffff81093185>] do_raw_spin_lock+0x145/0x150
[   15.356027]  [<ffffffff818b3ffb>] _raw_spin_lock_irq+0x1b/0x20
[   15.356027]  [<ffffffff810b91b0>] run_timer_softirq+0x40/0x2b0
[   15.356027]  [<ffffffff810c6ddd>] ? clockevents_program_event+0x7d/0x120
[   15.356027]  [<ffffffff8105b613>] __do_softirq+0xd3/0x280
[   15.356027]  [<ffffffff8105b8d2>] irq_exit+0x42/0x50
[   15.356027]  [<ffffffff8103de5d>] smp_apic_timer_interrupt+0x3d/0x50
[   15.356027]  [<ffffffff818b538f>] apic_timer_interrupt+0x7f/0x90
[   15.356027]  <EOI> \x01d [<ffffffff818b414f>] ? _raw_spin_unlock_irq+0xf/0x30
[   15.356027]  [<ffffffff818b4149>] ? _raw_spin_unlock_irq+0x9/0x30
[   15.356027]  [<ffffffff810d4da6>] acct_collect+0x166/0x1a0
[   15.356027]  [<ffffffff81058cd9>] do_exit+0x4f9/0xc00
[   15.356027]  [<ffffffff810087e4>] oops_end+0x84/0xb0
[   15.356027]  [<ffffffff8104a612>] no_context+0x102/0x330
[   15.356027]  [<ffffffff8104a8b5>] __bad_area_nosemaphore+0x75/0x1f0
[   15.356027]  [<ffffffff8104aa3e>] bad_area_nosemaphore+0xe/0x10
[   15.356027]  [<ffffffff8104ac95>] __do_page_fault+0x85/0x450
[   15.356027]  [<ffffffff8104b06c>] do_page_fault+0xc/0x10
[   15.356027]  [<ffffffff818b6422>] page_fault+0x22/0x30
[   15.356027]  [<ffffffff810b9452>] ? migrate_timer_list+0x32/0xc0
[   15.356027]  [<ffffffff810b9483>] ? migrate_timer_list+0x63/0xc0
[   15.356027]  [<ffffffff810b95c4>] timer_cpu_notify+0xe4/0x160
[   15.356027]  [<ffffffff81073ea5>] notifier_call_chain+0x45/0x70
[   15.356027]  [<ffffffff81073fc9>] __raw_notifier_call_chain+0x9/0x10
[   15.356027]  [<ffffffff8105759e>] cpu_notify_nofail+0x1e/0x30
[   15.356027]  [<ffffffff81057852>] _cpu_down+0x212/0x350
[   15.356027]  [<ffffffff810b3350>] ? __call_rcu.constprop.74+0x380/0x380
[   15.356027]  [<ffffffff810b33b0>] ? call_rcu_bh+0x20/0x20
[   15.356027]  [<ffffffff810a8950>] ? __rcu_read_unlock+0x50/0x50
[   15.356027]  [<ffffffff810a8950>] ? __rcu_read_unlock+0x50/0x50
[   15.356027]  [<ffffffff810579bf>] cpu_down+0x2f/0x50
[   15.356027]  [<ffffffff811266b5>] torture_onoff+0x115/0x380
[   15.356027]  [<ffffffff811265a0>] ? torture_kthread_stopping+0x70/0x70
[   15.356027]  [<ffffffff810732f6>] kthread+0xd6/0xf0
[   15.356027]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[   15.356027]  [<ffffffff818b499f>] ret_from_fork+0x3f/0x70
[   15.356027]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[   15.356027] Code: 48 03 14 c5 20 f5 f2 81 48 89 0a 8b 41 08 85 c0 75 09 f3 90 8b 41 08 85 c0 74 f7 4c 8b 01 4d 85 c0 74 08 41 0f 18 08 eb 02 f3 90 <8b> 13 66 85 d2 75 f7 be 01 00 00 00 eb 10 89 d0 f0 0f b1 33 39 
[   15.356027] NMI backtrace for cpu 3
[   15.356027] CPU: 3 PID: 773 Comm: rcu_torture_fak Tainted: G      D         4.5.0-rc1+ #14
[   15.356027] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.1-20160216_104851-anatol 04/01/2014
[   15.356027] task: ffff88007c640000 ti: ffff88007c648000 task.ti: ffff88007c648000
[   15.356027] RIP: 0010:[<ffffffff810920af>]  [<ffffffff810920af>] queued_spin_lock_slowpath+0x16f/0x1a0
[   15.356027] RSP: 0018:ffff88007c64bcf0  EFLAGS: 00000002
[   15.356027] RAX: 0000000000080101 RBX: ffff88007fa2cc00 RCX: 0000000000000001
[   15.356027] RDX: 0000000000000101 RSI: 0000000000000001 RDI: 0000000000000101
[   15.356027] RBP: ffff88007c64bd08 R08: 0000000000000716 R09: 0000000000000332
[   15.356027] R10: ffff88007c64bf58 R11: 0000000000000332 R12: 0000000057288000
[   15.356027] R13: 0000000000000001 R14: 0000000057288000 R15: ffff88007c64bda0
[   15.356027] FS:  0000000000000000(0000) GS:ffff88007fa60000(0000) knlGS:0000000000000000
[   15.356027] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[   15.356027] CR2: 0000560af8460720 CR3: 0000000001e0f000 CR4: 00000000000006e0
[   15.356027] Stack:
[   15.356027]  ffff88007fa2cc00 0000000057288000 0000000000000001 ffff88007c64bd38
[   15.356027]  ffffffff81093185 0000000000000286 ffff88007fa2cc00 ffff88007fa2cc00
[   15.356027]  000000000000cc00 ffff88007c64bd58 ffffffff818b401f 0000000000000001
[   15.356027] Call Trace:
[   15.356027]  [<ffffffff81093185>] do_raw_spin_lock+0x145/0x150
[   15.356027]  [<ffffffff818b401f>] _raw_spin_lock_irqsave+0x1f/0x30
[   15.356027]  [<ffffffff810b8faf>] lock_timer_base.isra.23+0x4f/0x70
[   15.356027]  [<ffffffff810b904b>] try_to_del_timer_sync+0x1b/0x60
[   15.356027]  [<ffffffff810b90d3>] del_timer_sync+0x43/0x50
[   15.356027]  [<ffffffff818b35e6>] schedule_timeout+0x116/0x230
[   15.356027]  [<ffffffff810b8dd0>] ? detach_if_pending+0xf0/0xf0
[   15.356027]  [<ffffffff810ac000>] ? sched_torture_read_unlock+0x30/0x30
[   15.356027]  [<ffffffff818b3759>] schedule_timeout_uninterruptible+0x19/0x20
[   15.356027]  [<ffffffff810ac087>] rcu_torture_fakewriter+0x87/0x160
[   15.356027]  [<ffffffff810732f6>] kthread+0xd6/0xf0
[   15.356027]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[   15.356027]  [<ffffffff818b499f>] ret_from_fork+0x3f/0x70
[   15.356027]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[   15.356027] Code: c2 89 d0 66 31 c0 39 c7 74 e7 4d 85 c0 c6 03 01 74 30 41 c7 40 08 01 00 00 00 e9 4e ff ff ff 83 fa 01 75 07 e9 4b ff ff ff f3 90 <8b> 03 84 c0 75 f8 b8 01 00 00 00 66 89 03 5b 41 5c 41 5d 5d c3 
[   15.356027] NMI backtrace for cpu 4
[   15.356027] CPU: 4 PID: 787 Comm: rcu_torture_rea Tainted: G      D         4.5.0-rc1+ #14
[   15.356027] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.1-20160216_104851-anatol 04/01/2014
[   15.356027] task: ffff88007c5fb200 ti: ffff88007c518000 task.ti: ffff88007c518000
[   15.356027] RIP: 0010:[<ffffffff81045ea1>]  [<ffffffff81045ea1>] read_hpet+0x11/0x20
[   15.356027] RSP: 0018:ffff88007fa83e08  EFLAGS: 00000046
[   15.356027] RAX: 000000008e223898 RBX: 000000055ae82600 RCX: 0000000000000009
[   15.356027] RDX: fffffffffffffeea RSI: ffffffff81ca0d44 RDI: ffffffff81e2b020
[   15.356027] RBP: ffff88007fa83e08 R08: 0000000000000000 R09: ffff88007fa8cc00
[   15.356027] R10: ffff88007c51be30 R11: 0000000000000002 R12: 0000000000000000
[   15.356027] R13: 000000000000b436 R14: ffff88007c5fb200 R15: ffff88007fa8dde8
[   15.356027] FS:  0000000000000000(0000) GS:ffff88007fa80000(0000) knlGS:0000000000000000
[   15.356027] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[   15.356027] CR2: 0000560af8460720 CR3: 0000000001e0f000 CR4: 00000000000006e0
[   15.356027] Stack:
[   15.356027]  ffff88007fa83e30 ffffffff810c09f7 ffff88007fa95e00 0000000000015380
[   15.356027]  0000000000000004 ffff88007fa83e50 ffffffff810817d8 ffff88007fa95380
[   15.356027]  0000000000015380 ffff88007fa83e80 ffffffff8107dba1 ffff88007c5fb200
[   15.356027] Call Trace:
[   15.356027]  <IRQ> \x01d [<ffffffff810c09f7>] ktime_get+0x37/0xa0
[   15.356027]  [<ffffffff810817d8>] sched_clock_tick+0x38/0x80
[   15.356027]  [<ffffffff8107dba1>] scheduler_tick+0x31/0xd0
[   15.356027]  [<ffffffff810c8c30>] ? tick_init_highres+0x20/0x20
[   15.356027]  [<ffffffff810baaec>] update_process_times+0x4c/0x60
[   15.356027]  [<ffffffff810c8c78>] tick_sched_timer+0x48/0x180
[   15.356027]  [<ffffffff810bb048>] ? __remove_hrtimer+0x38/0x90
[   15.356027]  [<ffffffff810c8c30>] ? tick_init_highres+0x20/0x20
[   15.356027]  [<ffffffff810bb2f4>] __hrtimer_run_queues+0xa4/0x240
[   15.356027]  [<ffffffff810bb947>] hrtimer_interrupt+0xa7/0x1a0
[   15.356027]  [<ffffffff8103d381>] local_apic_timer_interrupt+0x31/0x50
[   15.356027]  [<ffffffff8103de58>] smp_apic_timer_interrupt+0x38/0x50
[   15.356027]  [<ffffffff818b538f>] apic_timer_interrupt+0x7f/0x90
[   15.356027]  <EOI> \x01d [<ffffffff813392f3>] ? delay_loop+0x23/0x30
[   15.356027]  [<ffffffff81339337>] __const_udelay+0x27/0x30
[   15.356027]  [<ffffffff810addf7>] rcu_read_delay+0xa7/0xb0
[   15.356027]  [<ffffffff810ad458>] rcu_torture_reader+0x1a8/0x2e0
[   15.356027]  [<ffffffff810ad590>] ? rcu_torture_reader+0x2e0/0x2e0
[   15.356027]  [<ffffffff810ad2b0>] ? rcutorture_trace_dump.part.7+0x20/0x20
[   15.356027]  [<ffffffff810732f6>] kthread+0xd6/0xf0
[   15.356027]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[   15.356027]  [<ffffffff818b499f>] ret_from_fork+0x3f/0x70
[   15.356027]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[   15.356027] Code: 00 29 c7 ba 00 00 00 00 b8 c2 ff ff ff 83 c7 80 0f 4d c2 5d c3 0f 1f 44 00 00 55 48 8b 05 40 7c 04 01 48 89 e5 8b 80 f0 00 00 00 <89> c0 5d c3 90 66 2e 0f 1f 84 00 00 00 00 00 80 3d 8a 7b 04 01 
[   15.356027] NMI backtrace for cpu 6
[   15.356027] CPU: 6 PID: 775 Comm: rcu_torture_fak Tainted: G      D         4.5.0-rc1+ #14
[   15.356027] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.1-20160216_104851-anatol 04/01/2014
[   15.356027] task: ffff88007c641900 ti: ffff88007c610000 task.ti: ffff88007c610000
[   15.356027] RIP: 0010:[<ffffffff8103ef7d>]  [<ffffffff8103ef7d>] default_send_IPI_mask_sequence_phys+0x9d/0xd0
[   15.356027] RSP: 0018:ffff88007c613c68  EFLAGS: 00000046
[   15.356027] RAX: 0000000000000400 RBX: 000000000000a130 RCX: 0000000000000006
[   15.356027] RDX: 0000000000000006 RSI: 0000000000000010 RDI: 0000000000000300
[   15.356027] RBP: ffff88007c613ca0 R08: 0000000000000000 R09: 00000000000094db
[   15.356027] R10: ffff88007c613f58 R11: 000000000000049f R12: ffffffff81f31740
[   15.356027] R13: 0000000000000400 R14: 0000000000000002 R15: 0000000000000006
[   15.356027] FS:  0000000000000000(0000) GS:ffff88007fac0000(0000) knlGS:0000000000000000
[   15.356027] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[   15.356027] CR2: 0000560af8460720 CR3: 0000000001e0f000 CR4: 00000000000006e0
[   15.356027] Stack:
[   15.356027]  0000000000000082 000000067c613c78 000000000000ff40 0000000000000001
[   15.356027]  ffffffff8103fd20 0000000057288000 ffff88007c613da0 ffff88007c613cb0
[   15.356027]  ffffffff8103fd36 ffff88007c613cf8 ffffffff81331299 ffffffff81008b50
[   15.356027] Call Trace:
[   15.356027]  [<ffffffff8103fd20>] ? irq_force_complete_move+0x20/0x20
[   15.356027]  [<ffffffff8103fd36>] nmi_raise_cpu_backtrace+0x16/0x20
[   15.356027]  [<ffffffff81331299>] nmi_trigger_all_cpu_backtrace+0x259/0x270
[   15.356027]  [<ffffffff81008b50>] ? show_stack+0x20/0x50
[   15.356027]  [<ffffffff8103fd74>] arch_trigger_all_cpu_backtrace+0x14/0x20
[   15.356027]  [<ffffffff810930e5>] do_raw_spin_lock+0xa5/0x150
[   15.356027]  [<ffffffff818b401f>] _raw_spin_lock_irqsave+0x1f/0x30
[   15.356027]  [<ffffffff810b8faf>] lock_timer_base.isra.23+0x4f/0x70
[   15.356027]  [<ffffffff810b904b>] try_to_del_timer_sync+0x1b/0x60
[   15.356027]  [<ffffffff810b90d3>] del_timer_sync+0x43/0x50
[   15.356027]  [<ffffffff818b35e6>] schedule_timeout+0x116/0x230
[   15.356027]  [<ffffffff810b8dd0>] ? detach_if_pending+0xf0/0xf0
[   15.356027]  [<ffffffff810ac000>] ? sched_torture_read_unlock+0x30/0x30
[   15.356027]  [<ffffffff818b3759>] schedule_timeout_uninterruptible+0x19/0x20
[   15.356027]  [<ffffffff810ac087>] rcu_torture_fakewriter+0x87/0x160
[   15.356027]  [<ffffffff810732f6>] kthread+0xd6/0xf0
[   15.356027]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[   15.356027]  [<ffffffff818b499f>] ret_from_fork+0x3f/0x70
[   15.356027]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[   15.356027] Code: 90 8b 0c 25 00 c3 5f ff 80 e5 10 75 f2 89 d0 c1 e0 18 89 04 25 10 c3 5f ff 41 83 fe 02 44 89 e8 41 0f 45 c6 89 04 25 00 c3 5f ff <eb> 91 48 8b 05 32 09 ef 00 89 55 d4 ff 90 18 01 00 00 8b 55 d4 
[   15.356027] NMI backtrace for cpu 7
[   15.356027] CPU: 7 PID: 791 Comm: rcu_torture_rea Tainted: G      D         4.5.0-rc1+ #14
[   15.356027] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.1-20160216_104851-anatol 04/01/2014
[   15.356027] task: ffff88007c5fe400 ti: ffff88007c608000 task.ti: ffff88007c608000
[   15.356027] RIP: 0010:[<ffffffff810920af>]  [<ffffffff810920af>] queued_spin_lock_slowpath+0x16f/0x1a0
[   15.356027] RSP: 0018:ffff88007c60bd18  EFLAGS: 00000002
[   15.356027] RAX: 0000000000000101 RBX: ffff88007fbacc00 RCX: 0000000000000001
[   15.356027] RDX: 0000000000000101 RSI: 0000000000000001 RDI: 0000000000000101
[   15.356027] RBP: ffff88007c60bd30 R08: 0000000000000000 R09: 0000000000000035
[   15.356027] R10: ffff88007c60bf58 R11: 0000000000036a30 R12: 0000000057288000
[   15.356027] R13: 0000000000000001 R14: 0000000057288000 R15: ffff88007c60bdd0
[   15.356027] FS:  0000000000000000(0000) GS:ffff88007fae0000(0000) knlGS:0000000000000000
[   15.356027] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[   15.356027] CR2: 0000560af8460720 CR3: 0000000001e0f000 CR4: 00000000000006e0
[   15.356027] Stack:
[   15.356027]  ffff88007fbacc00 0000000057288000 0000000000000001 ffff88007c60bd60
[   15.356027]  ffffffff81093185 0000000000000286 ffff88007fbacc00 ffff88007fbacc00
[   15.356027]  000000000000cc00 ffff88007c60bd80 ffffffff818b401f 000000000000000d
[   15.356027] Call Trace:
[   15.356027]  [<ffffffff81093185>] do_raw_spin_lock+0x145/0x150
[   15.356027]  [<ffffffff818b401f>] _raw_spin_lock_irqsave+0x1f/0x30
[   15.356027]  [<ffffffff810b8faf>] lock_timer_base.isra.23+0x4f/0x70
[   15.356027]  [<ffffffff810ba6fa>] mod_timer+0x6a/0x200
[   15.356027]  [<ffffffff810ad557>] rcu_torture_reader+0x2a7/0x2e0
[   15.356027]  [<ffffffff810ad590>] ? rcu_torture_reader+0x2e0/0x2e0
[   15.356027]  [<ffffffff810ad2b0>] ? rcutorture_trace_dump.part.7+0x20/0x20
[   15.356027]  [<ffffffff810732f6>] kthread+0xd6/0xf0
[   15.356027]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[   15.356027]  [<ffffffff818b499f>] ret_from_fork+0x3f/0x70
[   15.356027]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[   15.356027] Code: c2 89 d0 66 31 c0 39 c7 74 e7 4d 85 c0 c6 03 01 74 30 41 c7 40 08 01 00 00 00 e9 4e ff ff ff 83 fa 01 75 07 e9 4b ff ff ff f3 90 <8b> 03 84 c0 75 f8 b8 01 00 00 00 66 89 03 5b 41 5c 41 5d 5d c3 
[   15.356027] NMI backtrace for cpu 10
[   15.356027] CPU: 10 PID: 785 Comm: rcu_torture_rea Tainted: G      D         4.5.0-rc1+ #14
[   15.356027] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.1-20160216_104851-anatol 04/01/2014
[   15.356027] task: ffff88007c5f9900 ti: ffff88007c510000 task.ti: ffff88007c510000
[   15.356027] RIP: 0010:[<ffffffff813392f3>]  [<ffffffff813392f3>] delay_loop+0x23/0x30
[   15.356027] RSP: 0018:ffff88007c513dd0  EFLAGS: 00000202
[   15.356027] RAX: 00000000000aabe3 RBX: 000000000000000a RCX: 000000000016e360
[   15.356027] RDX: 00000000001a400d RSI: 0000000000000001 RDI: 00000000001a400e
[   15.356027] RBP: ffff88007c513dd0 R08: ffff88007c510000 R09: ffff88007fb4cc00
[   15.356027] R10: ffff88007c513e30 R11: 0000000000000001 R12: ffff88007c513e20
[   15.356027] R13: 0000000576256a40 R14: 0000000000000072 R15: ffffffff820d6e80
[   15.356027] FS:  0000000000000000(0000) GS:ffff88007fb40000(0000) knlGS:0000000000000000
[   15.356027] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[   15.356027] CR2: 0000560af8460720 CR3: 0000000001e0f000 CR4: 00000000000006e0
[   15.356027] Stack:
[   15.356027]  ffff88007c513de0 ffffffff81339337 ffff88007c513e00 ffffffff810add86
[   15.356027]  0000000000000000 0000000000000000 ffff88007c513ea8 ffffffff810ad458
[   15.356027]  0000000000000000 0000000081a0a240 c75394843da0522a 000000000000075f
[   15.356027] Call Trace:
[   15.356027]  [<ffffffff81339337>] __const_udelay+0x27/0x30
[   15.356027]  [<ffffffff810add86>] rcu_read_delay+0x36/0xb0
[   15.356027]  [<ffffffff810ad458>] rcu_torture_reader+0x1a8/0x2e0
[   15.356027]  [<ffffffff810ad590>] ? rcu_torture_reader+0x2e0/0x2e0
[   15.356027]  [<ffffffff810ad2b0>] ? rcutorture_trace_dump.part.7+0x20/0x20
[   15.356027]  [<ffffffff810732f6>] kthread+0xd6/0xf0
[   15.356027]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[   15.356027]  [<ffffffff818b499f>] ret_from_fork+0x3f/0x70
[   15.356027]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[   15.356027] Code: 90 90 90 90 90 90 90 90 55 48 89 f8 48 89 e5 48 85 c0 74 19 eb 02 66 90 eb 0e 0f 1f 40 00 66 2e 0f 1f 84 00 00 00 00 00 48 ff c8 <75> fb 48 ff c8 5d c3 66 0f 1f 44 00 00 55 48 89 e5 ff 15 2e 2b 
[   15.356027] NMI backtrace for cpu 12
[   15.356027] CPU: 12 PID: 782 Comm: rcu_torture_rea Tainted: G      D         4.5.0-rc1+ #14
[   15.356027] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.1-20160216_104851-anatol 04/01/2014
[   15.356027] task: ffff88007c647080 ti: ffff88007caac000 task.ti: ffff88007caac000
[   15.356027] RIP: 0010:[<ffffffff81339300>]  [<ffffffff81339300>] __delay+0x0/0x10
[   15.356027] RSP: 0018:ffff88007caafd38  EFLAGS: 00000012
[   15.356027] RAX: 0000000000080101 RBX: ffff88007fa2cc00 RCX: 0000000000000001
[   15.356027] RDX: 0000000000000000 RSI: ffff88007caafdd0 RDI: 0000000000000001
[   15.356027] RBP: ffff88007caafd60 R08: ffff88007caac000 R09: 0000000000000002
[   15.356027] R10: 0000000000000000 R11: 0000000000000001 R12: 0000000020216720
[   15.356027] R13: 0000000000000001 R14: 0000000057288000 R15: ffff88007caafdd0
[   15.356027] FS:  0000000000000000(0000) GS:ffff88007fb80000(0000) knlGS:0000000000000000
[   15.356027] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[   15.356027] CR2: 0000000000000000 CR3: 0000000001e0f000 CR4: 00000000000006e0
[   15.356027] Stack:
[   15.356027]  ffffffff810930c7 0000000000000286 ffff88007fa2cc00 ffff88007fa2cc00
[   15.356027]  000000000000cc00 ffff88007caafd80 ffffffff818b401f 0000000000000001
[   15.356027]  ffff88007caafe58 ffff88007caafdb8 ffffffff810b8faf ffff88007caafe30
[   15.356027] Call Trace:
[   15.356027]  [<ffffffff810930c7>] ? do_raw_spin_lock+0x87/0x150
[   15.356027]  [<ffffffff818b401f>] _raw_spin_lock_irqsave+0x1f/0x30
[   15.356027]  [<ffffffff810b8faf>] lock_timer_base.isra.23+0x4f/0x70
[   15.356027]  [<ffffffff810ba6fa>] mod_timer+0x6a/0x200
[   15.356027]  [<ffffffff810ad557>] rcu_torture_reader+0x2a7/0x2e0
[   15.356027]  [<ffffffff810ad590>] ? rcu_torture_reader+0x2e0/0x2e0
[   15.356027]  [<ffffffff810ad2b0>] ? rcutorture_trace_dump.part.7+0x20/0x20
[   15.356027]  [<ffffffff810732f6>] kthread+0xd6/0xf0
[   15.356027]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[   15.356027]  [<ffffffff818b499f>] ret_from_fork+0x3f/0x70
[   15.356027]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[   15.356027] Code: 89 e5 48 85 c0 74 19 eb 02 66 90 eb 0e 0f 1f 40 00 66 2e 0f 1f 84 00 00 00 00 00 48 ff c8 75 fb 48 ff c8 5d c3 66 0f 1f 44 00 00 <55> 48 89 e5 ff 15 2e 2b b6 00 5d c3 0f 1f 40 00 55 48 8d 04 bd 
[   15.356027] NMI backtrace for cpu 15
[   15.356027] CPU: 15 PID: 788 Comm: rcu_torture_rea Tainted: G      D         4.5.0-rc1+ #14
[   15.356027] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.1-20160216_104851-anatol 04/01/2014
[   15.356027] task: ffff88007c5fbe80 ti: ffff88007c51c000 task.ti: ffff88007c51c000
[   15.356027] RIP: 0010:[<ffffffff811264c0>]  [<ffffffff811264c0>] stutter_wait+0x90/0xc0
[   15.356027] RSP: 0018:ffff88007c51fdf8  EFLAGS: 00000246
[   15.356027] RAX: 0000000000000000 RBX: ffffffff81c9f0eb RCX: 0000000000000001
[   15.356027] RDX: 0000000080000000 RSI: ffffffff81d29759 RDI: ffffffff81c9f0eb
[   15.356027] RBP: ffff88007c51fe00 R08: ffff88007c51c000 R09: ffff88007fbecc00
[   15.356027] R10: ffff88007c51fe30 R11: 0000000000000001 R12: 0000000000000000
[   15.356027] R13: 000000057adadc00 R14: 0000000000000072 R15: ffffffff820d6e80
[   15.356027] FS:  0000000000000000(0000) GS:ffff88007fbe0000(0000) knlGS:0000000000000000
[   15.356027] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[   15.356027] CR2: 00007fa3445ac000 CR3: 000000007b2ba000 CR4: 00000000000006e0
[   15.356027] Stack:
[   15.356027]  0000000000000000 ffff88007c51fea8 ffffffff810ad3ce 0000000000000000
[   15.356027]  0000000081a0a240 4e041f0d301dbec3 000000000000199d 0000000000000000
[   15.356027]  ffff88007fbeccc8 00000000fffbc810 ffffffff810ad590 0000000000000000
[   15.356027] Call Trace:
[   15.356027]  [<ffffffff810ad3ce>] rcu_torture_reader+0x11e/0x2e0
[   15.356027]  [<ffffffff810ad590>] ? rcu_torture_reader+0x2e0/0x2e0
[   15.356027]  [<ffffffff810ad2b0>] ? rcutorture_trace_dump.part.7+0x20/0x20
[   15.356027]  [<ffffffff810732f6>] kthread+0xd6/0xf0
[   15.356027]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[   15.356027]  [<ffffffff818b499f>] ret_from_fork+0x3f/0x70
[   15.356027]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[   15.356027] Code: f9 ff 48 89 c7 e8 61 d2 78 00 48 89 df e8 49 ff ff ff eb 98 bf 01 00 00 00 e8 4d d2 78 00 48 89 df e8 35 ff ff ff eb 84 5b 5d c3 <e8> fb 91 f8 ff 65 48 8b 04 25 00 ae 00 00 0f b6 90 78 03 00 00 
[   20.359026] BUG: spinlock lockup suspected on CPU#12, rcu_torture_rea/782
[   20.359026]  lock: 0xffff88007fa2cc00, .magic: dead4ead, .owner: torture_onoff/795, .owner_cpu: 1
[   20.359026] CPU: 12 PID: 782 Comm: rcu_torture_rea Tainted: G      D         4.5.0-rc1+ #14
[   20.359026] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.1-20160216_104851-anatol 04/01/2014
[   20.359026]  ffff88007fa2cc00 ffff88007caafd10 ffffffff8132cd6c ffff88007c651900
[   20.359026]  ffff88007caafd30 ffffffff81092fb3 ffff88007fa2cc00 0000000057288000
[   20.359026]  ffff88007caafd60 ffffffff810930db 0000000000000286 ffff88007fa2cc00
[   20.359026] Call Trace:
[   20.359026]  [<ffffffff8132cd6c>] dump_stack+0x4e/0x82
[   20.359026]  [<ffffffff81092fb3>] spin_dump+0x73/0xc0
[   20.359026]  [<ffffffff810930db>] do_raw_spin_lock+0x9b/0x150
[   20.359026]  [<ffffffff818b401f>] _raw_spin_lock_irqsave+0x1f/0x30
[   20.359026]  [<ffffffff810b8faf>] lock_timer_base.isra.23+0x4f/0x70
[   20.359026]  [<ffffffff810ba6fa>] mod_timer+0x6a/0x200
[   20.359026]  [<ffffffff810ad557>] rcu_torture_reader+0x2a7/0x2e0
[   20.359026]  [<ffffffff810ad590>] ? rcu_torture_reader+0x2e0/0x2e0
[   20.359026]  [<ffffffff810ad2b0>] ? rcutorture_trace_dump.part.7+0x20/0x20
[   20.359026]  [<ffffffff810732f6>] kthread+0xd6/0xf0
[   20.359026]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[   20.359026]  [<ffffffff818b499f>] ret_from_fork+0x3f/0x70
[   20.359026]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[   20.359026] Sending NMI to all CPUs:
[   20.359026] NMI backtrace for cpu 0
[   20.359026] CPU: 0 PID: 779 Comm: rcu_torture_rea Tainted: G      D         4.5.0-rc1+ #14
[   20.359026] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.1-20160216_104851-anatol 04/01/2014
[   20.359026] task: ffff88007c644b00 ti: ffff88007cab0000 task.ti: ffff88007cab0000
[   20.359026] RIP: 0010:[<ffffffff818af940>]  [<ffffffff818af940>] _cond_resched+0x0/0x20
[   20.359026] RSP: 0018:ffff88007cab3df0  EFLAGS: 00000202
[   20.359026] RAX: 0000000000000001 RBX: ffffffff81c9f0eb RCX: 0000000000000001
[   20.359026] RDX: 0000000080000000 RSI: 0000000000000286 RDI: ffffffff81c9f0eb
[   20.359026] RBP: ffff88007cab3e00 R08: ffff88007cab0000 R09: ffff88007fa0cc00
[   20.359026] R10: ffff88007cab3e30 R11: 0000000000000001 R12: 0000000000000000
[   20.359026] R13: 00000005e6fa4d80 R14: 0000000000000072 R15: ffffffff820d6e80
[   20.359026] FS:  0000000000000000(0000) GS:ffff88007fa00000(0000) knlGS:0000000000000000
[   20.359026] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[   20.359026] CR2: 00007ffd0da7e3bc CR3: 0000000001e0f000 CR4: 00000000000006f0
[   20.359026] Stack:
[   20.359026]  ffffffff81126479 0000000000000000 ffff88007cab3ea8 ffffffff810ad3ce
[   20.359026]  0000000000000000 0000000081a0a240 97391fc755e3bf03 00000000000009c9
[   20.359026]  dead000000000200 0000000000000000 00000000fffbcf27 ffffffff810ad590
[   20.359026] Call Trace:
[   20.359026]  [<ffffffff81126479>] ? stutter_wait+0x49/0xc0
[   20.359026]  [<ffffffff810ad3ce>] rcu_torture_reader+0x11e/0x2e0
[   20.359026]  [<ffffffff810ad590>] ? rcu_torture_reader+0x2e0/0x2e0
[   20.359026]  [<ffffffff810ad2b0>] ? rcutorture_trace_dump.part.7+0x20/0x20
[   20.359026]  [<ffffffff810732f6>] kthread+0xd6/0xf0
[   20.359026]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[   20.359026]  [<ffffffff818b499f>] ret_from_fork+0x3f/0x70
[   20.359026]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[   20.359026] Code: 75 7e a9 ff ff ff 7f 74 01 c3 9c 58 f6 c4 02 74 f8 55 48 89 e5 e8 a1 ff ff ff 5d c3 0f 1f 44 00 00 66 2e 0f 1f 84 00 00 00 00 00 <65> 8b 15 49 b4 75 7e 85 d2 74 03 31 c0 c3 55 48 89 e5 e8 79 ff 
[   20.359026] NMI backtrace for cpu 1
[   20.359026] CPU: 1 PID: 795 Comm: torture_onoff Tainted: G      D         4.5.0-rc1+ #14
[   20.359026] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.1-20160216_104851-anatol 04/01/2014
[   20.359026] task: ffff88007c651900 ti: ffff88007c660000 task.ti: ffff88007c660000
[   20.359026] RIP: 0010:[<ffffffff81092067>]  [<ffffffff81092067>] queued_spin_lock_slowpath+0x127/0x1a0
[   20.359026] RSP: 0018:ffff88007fa23e58  EFLAGS: 00000002
[   20.359026] RAX: 0000000000000000 RBX: ffff88007fa2cc00 RCX: ffff88007fa35e80
[   20.359026] RDX: 00000000001c0101 RSI: ffffffff81ca0d44 RDI: 0000000000080000
[   20.359026] RBP: ffff88007fa23e70 R08: 0000000000000000 R09: 0000000000000486
[   20.359026] R10: ffff88007c663f58 R11: 0000000000000486 R12: 0000000000000000
[   20.359026] R13: ffff88007fa35e80 R14: 0000000057288000 R15: 0000000000000000
[   20.359026] FS:  0000000000000000(0000) GS:ffff88007fa20000(0000) knlGS:0000000000000000
[   20.359026] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[   20.359026] CR2: 0000000000000000 CR3: 000000007b124000 CR4: 00000000000006e0
[   20.359026] Stack:
[   20.359026]  ffff88007fa2cc00 0000000057288000 0000000000000001 ffff88007fa23ea0
[   20.359026]  ffffffff81093185 ffff88007fa2cc00 ffffffff81e080c8 0000000000000001
[   20.359026]  0000000000000001 ffff88007fa23eb8 ffffffff818b3ffb ffff88007fa2cc00
[   20.359026] Call Trace:
[   20.359026]  <IRQ> \x01d [<ffffffff81093185>] do_raw_spin_lock+0x145/0x150
[   20.359026]  [<ffffffff818b3ffb>] _raw_spin_lock_irq+0x1b/0x20
[   20.359026]  [<ffffffff810b91b0>] run_timer_softirq+0x40/0x2b0
[   20.359026]  [<ffffffff810c6ddd>] ? clockevents_program_event+0x7d/0x120
[   20.359026]  [<ffffffff8105b613>] __do_softirq+0xd3/0x280
[   20.359026]  [<ffffffff8105b8d2>] irq_exit+0x42/0x50
[   20.359026]  [<ffffffff8103de5d>] smp_apic_timer_interrupt+0x3d/0x50
[   20.359026]  [<ffffffff818b538f>] apic_timer_interrupt+0x7f/0x90
[   20.359026]  <EOI> \x01d [<ffffffff818b414f>] ? _raw_spin_unlock_irq+0xf/0x30
[   20.359026]  [<ffffffff818b4149>] ? _raw_spin_unlock_irq+0x9/0x30
[   20.359026]  [<ffffffff810d4da6>] acct_collect+0x166/0x1a0
[   20.359026]  [<ffffffff81058cd9>] do_exit+0x4f9/0xc00
[   20.359026]  [<ffffffff810087e4>] oops_end+0x84/0xb0
[   20.359026]  [<ffffffff8104a612>] no_context+0x102/0x330
[   20.359026]  [<ffffffff8104a8b5>] __bad_area_nosemaphore+0x75/0x1f0
[   20.359026]  [<ffffffff8104aa3e>] bad_area_nosemaphore+0xe/0x10
[   20.359026]  [<ffffffff8104ac95>] __do_page_fault+0x85/0x450
[   20.359026]  [<ffffffff8104b06c>] do_page_fault+0xc/0x10
[   20.359026]  [<ffffffff818b6422>] page_fault+0x22/0x30
[   20.359026]  [<ffffffff810b9452>] ? migrate_timer_list+0x32/0xc0
[   20.359026]  [<ffffffff810b9483>] ? migrate_timer_list+0x63/0xc0
[   20.359026]  [<ffffffff810b95c4>] timer_cpu_notify+0xe4/0x160
[   20.359026]  [<ffffffff81073ea5>] notifier_call_chain+0x45/0x70
[   20.359026]  [<ffffffff81073fc9>] __raw_notifier_call_chain+0x9/0x10
[   20.359026]  [<ffffffff8105759e>] cpu_notify_nofail+0x1e/0x30
[   20.359026]  [<ffffffff81057852>] _cpu_down+0x212/0x350
[   20.359026]  [<ffffffff810b3350>] ? __call_rcu.constprop.74+0x380/0x380
[   20.359026]  [<ffffffff810b33b0>] ? call_rcu_bh+0x20/0x20
[   20.359026]  [<ffffffff810a8950>] ? __rcu_read_unlock+0x50/0x50
[   20.359026]  [<ffffffff810a8950>] ? __rcu_read_unlock+0x50/0x50
[   20.359026]  [<ffffffff810579bf>] cpu_down+0x2f/0x50
[   20.359026]  [<ffffffff811266b5>] torture_onoff+0x115/0x380
[   20.359026]  [<ffffffff811265a0>] ? torture_kthread_stopping+0x70/0x70
[   20.359026]  [<ffffffff810732f6>] kthread+0xd6/0xf0
[   20.359026]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[   20.359026]  [<ffffffff818b499f>] ret_from_fork+0x3f/0x70
[   20.359026]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[   20.359026] Code: 48 03 14 c5 20 f5 f2 81 48 89 0a 8b 41 08 85 c0 75 09 f3 90 8b 41 08 85 c0 74 f7 4c 8b 01 4d 85 c0 74 08 41 0f 18 08 eb 02 f3 90 <8b> 13 66 85 d2 75 f7 be 01 00 00 00 eb 10 89 d0 f0 0f b1 33 39 
[   20.359026] NMI backtrace for cpu 3
[   20.359026] CPU: 3 PID: 773 Comm: rcu_torture_fak Tainted: G      D         4.5.0-rc1+ #14
[   20.359026] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.1-20160216_104851-anatol 04/01/2014
[   20.359026] task: ffff88007c640000 ti: ffff88007c648000 task.ti: ffff88007c648000
[   20.359026] RIP: 0010:[<ffffffff810920af>]  [<ffffffff810920af>] queued_spin_lock_slowpath+0x16f/0x1a0
[   20.359026] RSP: 0018:ffff88007c64bcf0  EFLAGS: 00000002
[   20.359026] RAX: 00000000001c0101 RBX: ffff88007fa2cc00 RCX: 0000000000000001
[   20.359026] RDX: 0000000000000101 RSI: 0000000000000001 RDI: 0000000000000101
[   20.359026] RBP: ffff88007c64bd08 R08: 0000000000000716 R09: 0000000000000332
[   20.359026] R10: ffff88007c64bf58 R11: 0000000000000332 R12: 0000000057288000
[   20.359026] R13: 0000000000000001 R14: 0000000057288000 R15: ffff88007c64bda0
[   20.359026] FS:  0000000000000000(0000) GS:ffff88007fa60000(0000) knlGS:0000000000000000
[   20.359026] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[   20.359026] CR2: 0000560af8460720 CR3: 0000000001e0f000 CR4: 00000000000006e0
[   20.359026] Stack:
[   20.359026]  ffff88007fa2cc00 0000000057288000 0000000000000001 ffff88007c64bd38
[   20.359026]  ffffffff81093185 0000000000000286 ffff88007fa2cc00 ffff88007fa2cc00
[   20.359026]  000000000000cc00 ffff88007c64bd58 ffffffff818b401f 0000000000000001
[   20.359026] Call Trace:
[   20.359026]  [<ffffffff81093185>] do_raw_spin_lock+0x145/0x150
[   20.359026]  [<ffffffff818b401f>] _raw_spin_lock_irqsave+0x1f/0x30
[   20.359026]  [<ffffffff810b8faf>] lock_timer_base.isra.23+0x4f/0x70
[   20.359026]  [<ffffffff810b904b>] try_to_del_timer_sync+0x1b/0x60
[   20.359026]  [<ffffffff810b90d3>] del_timer_sync+0x43/0x50
[   20.359026]  [<ffffffff818b35e6>] schedule_timeout+0x116/0x230
[   20.359026]  [<ffffffff810b8dd0>] ? detach_if_pending+0xf0/0xf0
[   20.359026]  [<ffffffff810ac000>] ? sched_torture_read_unlock+0x30/0x30
[   20.359026]  [<ffffffff818b3759>] schedule_timeout_uninterruptible+0x19/0x20
[   20.359026]  [<ffffffff810ac087>] rcu_torture_fakewriter+0x87/0x160
[   20.359026]  [<ffffffff810732f6>] kthread+0xd6/0xf0
[   20.359026]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[   20.359026]  [<ffffffff818b499f>] ret_from_fork+0x3f/0x70
[   20.359026]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[   20.359026] Code: c2 89 d0 66 31 c0 39 c7 74 e7 4d 85 c0 c6 03 01 74 30 41 c7 40 08 01 00 00 00 e9 4e ff ff ff 83 fa 01 75 07 e9 4b ff ff ff f3 90 <8b> 03 84 c0 75 f8 b8 01 00 00 00 66 89 03 5b 41 5c 41 5d 5d c3 
[   20.359026] NMI backtrace for cpu 4
[   20.359026] CPU: 4 PID: 787 Comm: rcu_torture_rea Tainted: G      D         4.5.0-rc1+ #14
[   20.359026] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.1-20160216_104851-anatol 04/01/2014
[   20.359026] task: ffff88007c5fb200 ti: ffff88007c518000 task.ti: ffff88007c518000
[   20.359026] RIP: 0010:[<ffffffff818af940>]  [<ffffffff818af940>] _cond_resched+0x0/0x20
[   20.359026] RSP: 0018:ffff88007c51bdf0  EFLAGS: 00000202
[   20.359026] RAX: 0000000000000001 RBX: ffffffff81c9f0eb RCX: 0000000000000001
[   20.359026] RDX: 0000000080000000 RSI: ffffffff81d29759 RDI: ffffffff81c9f0eb
[   20.359026] RBP: ffff88007c51be00 R08: ffff88007c518000 R09: ffff88007fa8cc00
[   20.359026] R10: ffff88007c51be30 R11: 0000000000000002 R12: 0000000000000000
[   20.359026] R13: 00000005e6fa4d80 R14: 0000000000000072 R15: ffffffff820d6e80
[   20.359026] FS:  0000000000000000(0000) GS:ffff88007fa80000(0000) knlGS:0000000000000000
[   20.359026] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[   20.359026] CR2: 0000560af8460720 CR3: 0000000001e0f000 CR4: 00000000000006e0
[   20.359026] Stack:
[   20.359026]  ffffffff81126479 0000000000000000 ffff88007c51bea8 ffffffff810ad3ce
[   20.359026]  0000000000000000 0000000081a0a240 3d1b1282eec7091b 0000000000001c8e
[   20.359026]  dead000000000200 0000000000000000 00000000fffbcf27 ffffffff810ad590
[   20.359026] Call Trace:
[   20.359026]  [<ffffffff81126479>] ? stutter_wait+0x49/0xc0
[   20.359026]  [<ffffffff810ad3ce>] rcu_torture_reader+0x11e/0x2e0
[   20.359026]  [<ffffffff810ad590>] ? rcu_torture_reader+0x2e0/0x2e0
[   20.359026]  [<ffffffff810ad2b0>] ? rcutorture_trace_dump.part.7+0x20/0x20
[   20.359026]  [<ffffffff810732f6>] kthread+0xd6/0xf0
[   20.359026]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[   20.359026]  [<ffffffff818b499f>] ret_from_fork+0x3f/0x70
[   20.359026]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[   20.359026] Code: 75 7e a9 ff ff ff 7f 74 01 c3 9c 58 f6 c4 02 74 f8 55 48 89 e5 e8 a1 ff ff ff 5d c3 0f 1f 44 00 00 66 2e 0f 1f 84 00 00 00 00 00 <65> 8b 15 49 b4 75 7e 85 d2 74 03 31 c0 c3 55 48 89 e5 e8 79 ff 
[   20.359026] NMI backtrace for cpu 6
[   20.359026] CPU: 6 PID: 775 Comm: rcu_torture_fak Tainted: G      D         4.5.0-rc1+ #14
[   20.359026] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.1-20160216_104851-anatol 04/01/2014
[   20.359026] task: ffff88007c641900 ti: ffff88007c610000 task.ti: ffff88007c610000
[   20.359026] RIP: 0010:[<ffffffff81092050>]  [<ffffffff81092050>] queued_spin_lock_slowpath+0x110/0x1a0
[   20.359026] RSP: 0018:ffff88007c613cf0  EFLAGS: 00000046
[   20.359026] RAX: 0000000000000000 RBX: ffff88007fa2cc00 RCX: ffff88007fad5e80
[   20.359026] RDX: ffff88007fa35e80 RSI: ffffffff81ca0d44 RDI: 00000000001c0000
[   20.359026] RBP: ffff88007c613d08 R08: 0000000000000000 R09: 00000000000005e5
[   20.359026] R10: ffff88007c613f58 R11: 00000000000005e5 R12: 0000000000000000
[   20.359026] R13: ffff88007fad5e80 R14: 0000000057288000 R15: ffff88007c613da0
[   20.359026] FS:  0000000000000000(0000) GS:ffff88007fac0000(0000) knlGS:0000000000000000
[   20.359026] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[   20.359026] CR2: 0000560af8460720 CR3: 0000000001e0f000 CR4: 00000000000006e0
[   20.359026] Stack:
[   20.359026]  ffff88007fa2cc00 0000000057288000 0000000000000001 ffff88007c613d38
[   20.359026]  ffffffff81093185 0000000000000286 ffff88007fa2cc00 ffff88007fa2cc00
[   20.359026]  000000000000cc00 ffff88007c613d58 ffffffff818b401f 0000000000000001
[   20.359026] Call Trace:
[   20.359026]  [<ffffffff81093185>] do_raw_spin_lock+0x145/0x150
[   20.359026]  [<ffffffff818b401f>] _raw_spin_lock_irqsave+0x1f/0x30
[   20.359026]  [<ffffffff810b8faf>] lock_timer_base.isra.23+0x4f/0x70
[   20.359026]  [<ffffffff810b904b>] try_to_del_timer_sync+0x1b/0x60
[   20.359026]  [<ffffffff810b90d3>] del_timer_sync+0x43/0x50
[   20.359026]  [<ffffffff818b35e6>] schedule_timeout+0x116/0x230
[   20.359026]  [<ffffffff810b8dd0>] ? detach_if_pending+0xf0/0xf0
[   20.359026]  [<ffffffff810ac000>] ? sched_torture_read_unlock+0x30/0x30
[   20.359026]  [<ffffffff818b3759>] schedule_timeout_uninterruptible+0x19/0x20
[   20.359026]  [<ffffffff810ac087>] rcu_torture_fakewriter+0x87/0x160
[   20.359026]  [<ffffffff810732f6>] kthread+0xd6/0xf0
[   20.359026]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[   20.359026]  [<ffffffff818b499f>] ret_from_fork+0x3f/0x70
[   20.359026]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[   20.359026] Code: c2 c1 e8 12 48 c1 ea 0c 83 e8 01 83 e2 30 48 98 48 81 c2 80 5e 01 00 48 03 14 c5 20 f5 f2 81 48 89 0a 8b 41 08 85 c0 75 09 f3 90 <8b> 41 08 85 c0 74 f7 4c 8b 01 4d 85 c0 74 08 41 0f 18 08 eb 02 
[   20.359026] NMI backtrace for cpu 7
[   20.359026] CPU: 7 PID: 791 Comm: rcu_torture_rea Tainted: G      D         4.5.0-rc1+ #14
[   20.359026] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.1-20160216_104851-anatol 04/01/2014
[   20.359026] task: ffff88007c5fe400 ti: ffff88007c608000 task.ti: ffff88007c608000
[   20.359026] RIP: 0010:[<ffffffff810920af>]  [<ffffffff810920af>] queued_spin_lock_slowpath+0x16f/0x1a0
[   20.359026] RSP: 0018:ffff88007c60bd18  EFLAGS: 00000002
[   20.359026] RAX: 0000000000000101 RBX: ffff88007fbacc00 RCX: 0000000000000001
[   20.359026] RDX: 0000000000000101 RSI: 0000000000000001 RDI: 0000000000000101
[   20.359026] RBP: ffff88007c60bd30 R08: 0000000000000000 R09: 0000000000000035
[   20.359026] R10: ffff88007c60bf58 R11: 0000000000036a30 R12: 0000000057288000
[   20.359026] R13: 0000000000000001 R14: 0000000057288000 R15: ffff88007c60bdd0
[   20.359026] FS:  0000000000000000(0000) GS:ffff88007fae0000(0000) knlGS:0000000000000000
[   20.359026] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[   20.359026] CR2: 0000560af8460720 CR3: 0000000001e0f000 CR4: 00000000000006e0
[   20.359026] Stack:
[   20.359026]  ffff88007fbacc00 0000000057288000 0000000000000001 ffff88007c60bd60
[   20.359026]  ffffffff81093185 0000000000000286 ffff88007fbacc00 ffff88007fbacc00
[   20.359026]  000000000000cc00 ffff88007c60bd80 ffffffff818b401f 000000000000000d
[   20.359026] Call Trace:
[   20.359026]  [<ffffffff81093185>] do_raw_spin_lock+0x145/0x150
[   20.359026]  [<ffffffff818b401f>] _raw_spin_lock_irqsave+0x1f/0x30
[   20.359026]  [<ffffffff810b8faf>] lock_timer_base.isra.23+0x4f/0x70
[   20.359026]  [<ffffffff810ba6fa>] mod_timer+0x6a/0x200
[   20.359026]  [<ffffffff810ad557>] rcu_torture_reader+0x2a7/0x2e0
[   20.359026]  [<ffffffff810ad590>] ? rcu_torture_reader+0x2e0/0x2e0
[   20.359026]  [<ffffffff810ad2b0>] ? rcutorture_trace_dump.part.7+0x20/0x20
[   20.359026]  [<ffffffff810732f6>] kthread+0xd6/0xf0
[   20.359026]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[   20.359026]  [<ffffffff818b499f>] ret_from_fork+0x3f/0x70
[   20.359026]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[   20.359026] Code: c2 89 d0 66 31 c0 39 c7 74 e7 4d 85 c0 c6 03 01 74 30 41 c7 40 08 01 00 00 00 e9 4e ff ff ff 83 fa 01 75 07 e9 4b ff ff ff f3 90 <8b> 03 84 c0 75 f8 b8 01 00 00 00 66 89 03 5b 41 5c 41 5d 5d c3 
[   20.359026] NMI backtrace for cpu 10
[   20.359026] CPU: 10 PID: 0 Comm: swapper/10 Tainted: G      D         4.5.0-rc1+ #14
[   20.359026] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.1-20160216_104851-anatol 04/01/2014
[   20.359026] task: ffff88007cc98c80 ti: ffff88007cca4000 task.ti: ffff88007cca4000
[   20.359026] RIP: 0010:[<ffffffff8100f303>]  [<ffffffff8100f303>] default_idle+0x13/0xd0
[   20.359026] RSP: 0018:ffff88007cca7ec0  EFLAGS: 00000202
[   20.359026] RAX: 000000000000000a RBX: ffff88007cca8000 RCX: 0000000000000000
[   20.359026] RDX: 0000000000000000 RSI: ffffffff81ca0d44 RDI: ffffffff81cbdfe7
[   20.359026] RBP: ffff88007cca7ed0 R08: 0000000000000000 R09: 0000000000000000
[   20.359026] R10: 0000000000000400 R11: 0000000000000002 R12: 0000000000000000
[   20.359026] R13: 0000000000000000 R14: ffff88007cca4000 R15: ffff88007cca4000
[   20.359026] FS:  0000000000000000(0000) GS:ffff88007fb40000(0000) knlGS:0000000000000000
[   20.359026] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[   20.359026] CR2: 0000560af8460720 CR3: 0000000001e0f000 CR4: 00000000000006e0
[   20.359026] Stack:
[   20.359026]  ffff88007cca8000 0000000000000000 ffff88007cca7ee0 ffffffff8100fafa
[   20.359026]  ffff88007cca7ef0 ffffffff8108fd65 ffff88007cca7f30 ffffffff8108fff7
[   20.359026]  ffff88007cca8000 000000000000000a 0000000000000000 0000000000000000
[   20.359026] Call Trace:
[   20.359026]  [<ffffffff8100fafa>] arch_cpu_idle+0xa/0x10
[   20.359026]  [<ffffffff8108fd65>] default_idle_call+0x25/0x30
[   20.359026]  [<ffffffff8108fff7>] cpu_startup_entry+0x287/0x2e0
[   20.359026]  [<ffffffff8103bf29>] start_secondary+0xf9/0x100
[   20.359026] Code: 0f 1f 84 00 00 00 00 00 55 89 ff 48 89 e5 f0 48 0f ab 3e 5d c3 0f 1f 00 55 48 89 e5 41 54 53 e8 c4 8d 33 00 66 66 66 66 90 fb f4 <e8> b8 8d 33 00 41 89 c4 66 66 66 66 90 5b 41 5c 5d c3 41 89 c4 
[   20.359026] NMI backtrace for cpu 12
[   20.359026] CPU: 12 PID: 782 Comm: rcu_torture_rea Tainted: G      D         4.5.0-rc1+ #14
[   20.359026] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.1-20160216_104851-anatol 04/01/2014
[   20.359026] task: ffff88007c647080 ti: ffff88007caac000 task.ti: ffff88007caac000
[   20.359026] RIP: 0010:[<ffffffff8103ef7d>]  [<ffffffff8103ef7d>] default_send_IPI_mask_sequence_phys+0x9d/0xd0
[   20.359026] RSP: 0018:ffff88007caafc90  EFLAGS: 00000046
[   20.359026] RAX: 0000000000000400 RBX: 000000000000a130 RCX: 000000000000000c
[   20.359026] RDX: 000000000000000c RSI: 0000000000000010 RDI: 0000000000000300
[   20.359026] RBP: ffff88007caafcc8 R08: 0000000000000000 R09: 00000000000094db
[   20.359026] R10: ffff88007caaff58 R11: 00000000000005fb R12: ffffffff81f31740
[   20.359026] R13: 0000000000000400 R14: 0000000000000002 R15: 000000000000000c
[   20.359026] FS:  0000000000000000(0000) GS:ffff88007fb80000(0000) knlGS:0000000000000000
[   20.359026] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[   20.359026] CR2: 0000000000000000 CR3: 0000000001e0f000 CR4: 00000000000006e0
[   20.359026] Stack:
[   20.359026]  0000000000000086 0000000c7caafca0 000000000000ff40 0000000000000001
[   20.359026]  ffffffff8103fd20 0000000057288000 ffff88007caafdd0 ffff88007caafcd8
[   20.359026]  ffffffff8103fd36 ffff88007caafd20 ffffffff81331299 ffffffff81008b50
[   20.359026] Call Trace:
[   20.359026]  [<ffffffff8103fd20>] ? irq_force_complete_move+0x20/0x20
[   20.359026]  [<ffffffff8103fd36>] nmi_raise_cpu_backtrace+0x16/0x20
[   20.359026]  [<ffffffff81331299>] nmi_trigger_all_cpu_backtrace+0x259/0x270
[   20.359026]  [<ffffffff81008b50>] ? show_stack+0x20/0x50
[   20.359026]  [<ffffffff8103fd74>] arch_trigger_all_cpu_backtrace+0x14/0x20
[   20.359026]  [<ffffffff810930e5>] do_raw_spin_lock+0xa5/0x150
[   20.359026]  [<ffffffff818b401f>] _raw_spin_lock_irqsave+0x1f/0x30
[   20.359026]  [<ffffffff810b8faf>] lock_timer_base.isra.23+0x4f/0x70
[   20.359026]  [<ffffffff810ba6fa>] mod_timer+0x6a/0x200
[   20.359026]  [<ffffffff810ad557>] rcu_torture_reader+0x2a7/0x2e0
[   20.359026]  [<ffffffff810ad590>] ? rcu_torture_reader+0x2e0/0x2e0
[   20.359026]  [<ffffffff810ad2b0>] ? rcutorture_trace_dump.part.7+0x20/0x20
[   20.359026]  [<ffffffff810732f6>] kthread+0xd6/0xf0
[   20.359026]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[   20.359026]  [<ffffffff818b499f>] ret_from_fork+0x3f/0x70
[   20.359026]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[   20.359026] Code: 90 8b 0c 25 00 c3 5f ff 80 e5 10 75 f2 89 d0 c1 e0 18 89 04 25 10 c3 5f ff 41 83 fe 02 44 89 e8 41 0f 45 c6 89 04 25 00 c3 5f ff <eb> 91 48 8b 05 32 09 ef 00 89 55 d4 ff 90 18 01 00 00 8b 55 d4 
[   20.359026] NMI backtrace for cpu 15
[   20.359026] CPU: 15 PID: 788 Comm: rcu_torture_rea Tainted: G      D         4.5.0-rc1+ #14
[   20.359026] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.1-20160216_104851-anatol 04/01/2014
[   20.359026] task: ffff88007c5fbe80 ti: ffff88007c51c000 task.ti: ffff88007c51c000
[   20.359026] RIP: 0010:[<ffffffff81126479>]  [<ffffffff81126479>] stutter_wait+0x49/0xc0
[   20.359026] RSP: 0018:ffff88007c51fdf8  EFLAGS: 00000246
[   20.359026] RAX: 0000000000000000 RBX: ffffffff81c9f0eb RCX: 0000000000000001
[   20.359026] RDX: 0000000080000000 RSI: ffffffff81d29759 RDI: ffffffff81c9f0eb
[   20.359026] RBP: ffff88007c51fe00 R08: ffff88007c51c000 R09: ffff88007fbecc00
[   20.359026] R10: ffff88007c51fe30 R11: 0000000000000001 R12: 0000000000000000
[   20.359026] R13: 00000005e6fa4d80 R14: 0000000000000072 R15: ffffffff820d6e80
[   20.359026] FS:  0000000000000000(0000) GS:ffff88007fbe0000(0000) knlGS:0000000000000000
[   20.359026] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[   20.359026] CR2: 00007fa3445ac000 CR3: 000000007b2ba000 CR4: 00000000000006e0
[   20.359026] Stack:
[   20.359026]  0000000000000000 ffff88007c51fea8 ffffffff810ad3ce 0000000000000000
[   20.359026]  0000000081a0a240 2474d2f222e8f670 0000000000000b8f dead000000000200
[   20.359026]  0000000000000000 00000000fffbcf27 ffffffff810ad590 0000000000000000
[   20.359026] Call Trace:
[   20.359026]  [<ffffffff810ad3ce>] rcu_torture_reader+0x11e/0x2e0
[   20.359026]  [<ffffffff810ad590>] ? rcu_torture_reader+0x2e0/0x2e0
[   20.359026]  [<ffffffff810ad2b0>] ? rcutorture_trace_dump.part.7+0x20/0x20
[   20.359026]  [<ffffffff810732f6>] kthread+0xd6/0xf0
[   20.359026]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[   20.359026]  [<ffffffff818b499f>] ret_from_fork+0x3f/0x70
[   20.359026]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[   20.359026] Code: 0e af fd 00 48 85 c0 74 66 8b 00 85 c0 75 60 8b 05 61 ae fd 00 85 c0 74 26 8b 05 57 ae fd 00 83 f8 01 75 07 eb 35 e8 c7 94 78 00 <8b> 05 45 ae fd 00 85 c0 75 f1 48 89 df e8 65 ff ff ff eb b4 bf 
[   33.172025] INFO: rcu_preempt detected stalls on CPUs/tasks:
[   33.172025] 	13-O.N: (0 ticks this GP) idle=40f/140000000000000/0 softirq=258/258 fqs=1 
[   33.172025] 	(detected by 0, t=21002 jiffies, g=114, c=113, q=8)
[   33.172025] Task dump for CPU 13:
[   33.172025] swapper/13      R  running task    15600     0      1 0x00200000
[   33.172025]  ffff88007ccb4000 0000000000000000 0000000000000000 ffff88007ccb4000
[   33.172025]  0000000000000000 0000000000000000 ffff88007ccb0000 ffff88007ccb3eb8
[   33.172025]  ffffffff813480f3 ffff88007ccb3ee0 ffffffff8103cd18 ffff88007ccb4000
[   33.172025] Call Trace:
[   33.172025]  [<ffffffff813480f3>] ? __this_cpu_preempt_check+0x13/0x20
[   33.172025]  [<ffffffff8103cd18>] ? native_play_dead+0xf8/0x130
[   33.172025]  [<ffffffff8100faea>] ? arch_cpu_idle_dead+0xa/0x10
[   33.172025]  [<ffffffff8108ffed>] ? cpu_startup_entry+0x27d/0x2e0
[   33.172025]  [<ffffffff8103bf29>] ? start_secondary+0xf9/0x100
[   33.172025] rcu_preempt kthread starved for 20999 jiffies! g114 c113 f0x0 RCU_GP_WAIT_FQS(3) ->state=0x1
[   33.172025] rcu_preempt     S ffff88007cc53d08 14696     7      2 0x00000000
[   33.172025]  ffff88007cc53d08 ffff88007fa2cc00 ffff88007c651900 ffff88007cc0cb00
[   33.172025]  ffffffff818b401f 0000000000000001 ffff88007cc54000 ffff88007fa2cc00
[   33.172025]  ffff88007cc53d40 ffff88007fa2cc00 0000000000000003 ffff88007cc53d20
[   33.172025] Call Trace:
[   33.172025]  [<ffffffff818b401f>] ? _raw_spin_lock_irqsave+0x1f/0x30
[   33.172025]  [<ffffffff818afa3a>] schedule+0x3a/0x90
[   33.172025]  [<ffffffff818b35de>] schedule_timeout+0x10e/0x230
[   33.172025]  [<ffffffff818b4189>] ? _raw_spin_unlock_irqrestore+0x19/0x30
[   33.172025]  [<ffffffff810b8dd0>] ? detach_if_pending+0xf0/0xf0
[   33.172025]  [<ffffffff810b3d27>] rcu_gp_kthread+0x957/0x1080
[   33.172025]  [<ffffffff8108c28a>] ? put_prev_task_rt+0x8a/0xb0
[   33.172025]  [<ffffffff818af400>] ? __schedule+0x630/0xb00
[   33.172025]  [<ffffffff8108fa70>] ? wake_atomic_t_function+0x60/0x60
[   33.172025]  [<ffffffff810b33d0>] ? call_rcu_sched+0x20/0x20
[   33.172025]  [<ffffffff810732f6>] kthread+0xd6/0xf0
[   33.172025]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[   33.172025]  [<ffffffff818b499f>] ret_from_fork+0x3f/0x70
[   33.172025]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[   60.351026] rcu-torture: rtc: ffffffff820d6e80 ver: 181 tfle: 0 rta: 182 rtaf: 0 rtf: 167 rtmbe: 0 rtbke: 0 rtbre: 0 rtbf: 0 rtb: 0 nt: 109826 onoff: 2/2:8/9 92,98:40,408 190:1424 (HZ=1000) barrier: 0/0:0 cbflood: 20
[   60.353026] rcu-torture: Reader Pipe:  793985317 340 0 0 0 0 0 0 0 0 0
[   60.353026] rcu-torture: Reader Batch:  791224797 2760860 0 0 0 0 0 0 0 0 0
[   60.354285] rcu-torture: Free-Block Circulation:  181 180 179 176 173 171 170 169 168 167 0
[   96.177032] INFO: rcu_preempt detected stalls on CPUs/tasks:
[   96.177032] 	13-O.N: (0 ticks this GP) idle=40f/140000000000000/0 softirq=258/258 fqs=1 
[   96.177032] 	(detected by 10, t=84008 jiffies, g=114, c=113, q=8)
[   96.177032] Task dump for CPU 13:
[   96.177032] swapper/13      R  running task    15600     0      1 0x00200000
[   96.177032]  ffff88007ccb4000 0000000000000000 0000000000000000 ffff88007ccb4000
[   96.177032]  0000000000000000 0000000000000000 ffff88007ccb0000 ffff88007ccb3eb8
[   96.177032]  ffffffff813480f3 ffff88007ccb3ee0 ffffffff8103cd18 ffff88007ccb4000
[   96.177032] Call Trace:
[   96.177032]  [<ffffffff813480f3>] ? __this_cpu_preempt_check+0x13/0x20
[   96.177032]  [<ffffffff8103cd18>] ? native_play_dead+0xf8/0x130
[   96.177032]  [<ffffffff8100faea>] ? arch_cpu_idle_dead+0xa/0x10
[   96.177032]  [<ffffffff8108ffed>] ? cpu_startup_entry+0x27d/0x2e0
[   96.177032]  [<ffffffff8103bf29>] ? start_secondary+0xf9/0x100
[   96.177032] rcu_preempt kthread starved for 84013 jiffies! g114 c113 f0x2 RCU_GP_WAIT_FQS(3) ->state=0x100
[   96.177032] rcu_preempt     W ffff88007cc53d08 14696     7      2 0x00000000
[   96.177032]  ffff88007cc53d08 ffff88007fa2cc00 ffff88007c651900 ffff88007cc0cb00
[   96.177032]  ffffffff818b401f 0000000000000001 ffff88007cc54000 ffff88007fa2cc00
[   96.177032]  ffff88007cc53d40 ffff88007fa2cc00 0000000000000003 ffff88007cc53d20
[   96.177032] Call Trace:
[   96.177032]  [<ffffffff818b401f>] ? _raw_spin_lock_irqsave+0x1f/0x30
[   96.177032]  [<ffffffff818afa3a>] schedule+0x3a/0x90
[   96.177032]  [<ffffffff818b35de>] schedule_timeout+0x10e/0x230
[   96.177032]  [<ffffffff818b4189>] ? _raw_spin_unlock_irqrestore+0x19/0x30
[   96.177032]  [<ffffffff810b8dd0>] ? detach_if_pending+0xf0/0xf0
[   96.177032]  [<ffffffff810b3d27>] rcu_gp_kthread+0x957/0x1080
[   96.177032]  [<ffffffff8108c28a>] ? put_prev_task_rt+0x8a/0xb0
[   96.177032]  [<ffffffff818af400>] ? __schedule+0x630/0xb00
[   96.177032]  [<ffffffff8108fa70>] ? wake_atomic_t_function+0x60/0x60
[   96.177032]  [<ffffffff810b33d0>] ? call_rcu_sched+0x20/0x20
[   96.177032]  [<ffffffff810732f6>] kthread+0xd6/0xf0
[   96.177032]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[   96.177032]  [<ffffffff818b499f>] ret_from_fork+0x3f/0x70
[   96.177032]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[  120.355040] rcu-torture: rtc: ffffffff820d6e80 ver: 181 tfle: 0 rta: 182 rtaf: 0 rtf: 167 rtmbe: 0 rtbke: 0 rtbre: 0 rtbf: 0 rtb: 0 nt: 195310 onoff: 2/2:8/9 92,98:40,408 190:1424 (HZ=1000) barrier: 0/0:0 cbflood: 20
[  120.357115] rcu-torture: Reader Pipe:  1420919931 340 0 0 0 0 0 0 0 0 0
[  120.358056] rcu-torture: Reader Batch:  1418159411 2760860 0 0 0 0 0 0 0 0 0
[  120.359077] rcu-torture: Free-Block Circulation:  181 180 179 176 173 171 170 169 168 167 0
[  120.360048] ??? Writer stall state RTWS_SYNC(7) g114 c113 f0x2
[  120.361292] rcu_preempt: wait state: 3 ->state: 0x100
[  120.361292] rcu_sched: wait state: 1 ->state: 0x1
[  120.362453] rcu_bh: wait state: 1 ->state: 0x1
[  120.362453] Dumping ftrace buffer:
[  120.362453]    (ftrace buffer empty)
[  159.182078] INFO: rcu_preempt detected stalls on CPUs/tasks:
[  159.182078] 	13-O.N: (0 ticks this GP) idle=40f/140000000000000/0 softirq=258/258 fqs=1 
[  159.182078] 	(detected by 15, t=147013 jiffies, g=114, c=113, q=8)
[  159.182078] Task dump for CPU 13:
[  159.182078] swapper/13      R  running task    15600     0      1 0x00200000
[  159.182078]  ffff88007ccb4000 0000000000000000 0000000000000000 ffff88007ccb4000
[  159.182078]  0000000000000000 0000000000000000 ffff88007ccb0000 ffff88007ccb3eb8
[  159.182078]  ffffffff813480f3 ffff88007ccb3ee0 ffffffff8103cd18 ffff88007ccb4000
[  159.182078] Call Trace:
[  159.182078]  [<ffffffff813480f3>] ? __this_cpu_preempt_check+0x13/0x20
[  159.182078]  [<ffffffff8103cd18>] ? native_play_dead+0xf8/0x130
[  159.182078]  [<ffffffff8100faea>] ? arch_cpu_idle_dead+0xa/0x10
[  159.182078]  [<ffffffff8108ffed>] ? cpu_startup_entry+0x27d/0x2e0
[  159.182078]  [<ffffffff8103bf29>] ? start_secondary+0xf9/0x100
[  159.182078] rcu_preempt kthread starved for 147016 jiffies! g114 c113 f0x2 RCU_GP_WAIT_FQS(3) ->state=0x100
[  159.182078] rcu_preempt     W ffff88007cc53d08 14696     7      2 0x00000000
[  159.182078]  ffff88007cc53d08 ffff88007fa2cc00 ffff88007c651900 ffff88007cc0cb00
[  159.182078]  ffffffff818b401f 0000000000000001 ffff88007cc54000 ffff88007fa2cc00
[  159.182078]  ffff88007cc53d40 ffff88007fa2cc00 0000000000000003 ffff88007cc53d20
[  159.182078] Call Trace:
[  159.182078]  [<ffffffff818b401f>] ? _raw_spin_lock_irqsave+0x1f/0x30
[  159.182078]  [<ffffffff818afa3a>] schedule+0x3a/0x90
[  159.182078]  [<ffffffff818b35de>] schedule_timeout+0x10e/0x230
[  159.182078]  [<ffffffff818b4189>] ? _raw_spin_unlock_irqrestore+0x19/0x30
[  159.182078]  [<ffffffff810b8dd0>] ? detach_if_pending+0xf0/0xf0
[  159.182078]  [<ffffffff810b3d27>] rcu_gp_kthread+0x957/0x1080
[  159.182078]  [<ffffffff8108c28a>] ? put_prev_task_rt+0x8a/0xb0
[  159.182078]  [<ffffffff818af400>] ? __schedule+0x630/0xb00
[  159.182078]  [<ffffffff8108fa70>] ? wake_atomic_t_function+0x60/0x60
[  159.182078]  [<ffffffff810b33d0>] ? call_rcu_sched+0x20/0x20
[  159.182078]  [<ffffffff810732f6>] kthread+0xd6/0xf0
[  159.182078]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[  159.182078]  [<ffffffff818b499f>] ret_from_fork+0x3f/0x70
[  159.182078]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[  180.363033] rcu-torture: rtc: ffffffff820d6e80 ver: 181 tfle: 0 rta: 182 rtaf: 0 rtf: 167 rtmbe: 0 rtbke: 0 rtbre: 0 rtbf: 0 rtb: 0 nt: 280738 onoff: 2/2:8/9 92,98:40,408 190:1424 (HZ=1000) barrier: 0/0:0 cbflood: 20
[  180.365172] rcu-torture: Reader Pipe:  2036955953 340 0 0 0 0 0 0 0 0 0
[  180.366053] rcu-torture: Reader Batch:  2034195433 2760860 0 0 0 0 0 0 0 0 0
[  180.367033] rcu-torture: Free-Block Circulation:  181 180 179 176 173 171 170 169 168 167 0
[  180.368093] ??? Writer stall state RTWS_SYNC(7) g114 c113 f0x2
[  180.369269] rcu_preempt: wait state: 3 ->state: 0x100
[  180.369269] rcu_sched: wait state: 1 ->state: 0x1
[  180.370393] rcu_bh: wait state: 1 ->state: 0x1
[  222.187034] INFO: rcu_preempt detected stalls on CPUs/tasks:
[  222.187034] 	13-O.N: (0 ticks this GP) idle=40f/140000000000000/0 softirq=258/258 fqs=1 
[  222.187034] 	(detected by 0, t=210017 jiffies, g=114, c=113, q=8)
[  222.187034] Task dump for CPU 13:
[  222.187034] swapper/13      R  running task    15600     0      1 0x00200000
[  222.187034]  ffff88007ccb4000 0000000000000000 0000000000000000 ffff88007ccb4000
[  222.187034]  0000000000000000 0000000000000000 ffff88007ccb0000 ffff88007ccb3eb8
[  222.187034]  ffffffff813480f3 ffff88007ccb3ee0 ffffffff8103cd18 ffff88007ccb4000
[  222.187034] Call Trace:
[  222.187034]  [<ffffffff813480f3>] ? __this_cpu_preempt_check+0x13/0x20
[  222.187034]  [<ffffffff8103cd18>] ? native_play_dead+0xf8/0x130
[  222.187034]  [<ffffffff8100faea>] ? arch_cpu_idle_dead+0xa/0x10
[  222.187034]  [<ffffffff8108ffed>] ? cpu_startup_entry+0x27d/0x2e0
[  222.187034]  [<ffffffff8103bf29>] ? start_secondary+0xf9/0x100
[  222.187034] rcu_preempt kthread starved for 210014 jiffies! g114 c113 f0x2 RCU_GP_WAIT_FQS(3) ->state=0x100
[  222.187034] rcu_preempt     W ffff88007cc53d08 14696     7      2 0x00000000
[  222.187034]  ffff88007cc53d08 ffff88007fa2cc00 ffff88007c651900 ffff88007cc0cb00
[  222.187034]  ffffffff818b401f 0000000000000001 ffff88007cc54000 ffff88007fa2cc00
[  222.187034]  ffff88007cc53d40 ffff88007fa2cc00 0000000000000003 ffff88007cc53d20
[  222.187034] Call Trace:
[  222.187034]  [<ffffffff818b401f>] ? _raw_spin_lock_irqsave+0x1f/0x30
[  222.187034]  [<ffffffff818afa3a>] schedule+0x3a/0x90
[  222.187034]  [<ffffffff818b35de>] schedule_timeout+0x10e/0x230
[  222.187034]  [<ffffffff818b4189>] ? _raw_spin_unlock_irqrestore+0x19/0x30
[  222.187034]  [<ffffffff810b8dd0>] ? detach_if_pending+0xf0/0xf0
[  222.187034]  [<ffffffff810b3d27>] rcu_gp_kthread+0x957/0x1080
[  222.187034]  [<ffffffff8108c28a>] ? put_prev_task_rt+0x8a/0xb0
[  222.187034]  [<ffffffff818af400>] ? __schedule+0x630/0xb00
[  222.187034]  [<ffffffff8108fa70>] ? wake_atomic_t_function+0x60/0x60
[  222.187034]  [<ffffffff810b33d0>] ? call_rcu_sched+0x20/0x20
[  222.187034]  [<ffffffff810732f6>] kthread+0xd6/0xf0
[  222.187034]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[  222.187034]  [<ffffffff818b499f>] ret_from_fork+0x3f/0x70
[  222.187034]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[  240.370025] rcu-torture: rtc: ffffffff820d6e80 ver: 181 tfle: 0 rta: 182 rtaf: 0 rtf: 167 rtmbe: 0 rtbke: 0 rtbre: 0 rtbf: 0 rtb: 0 nt: 367421 onoff: 2/2:8/9 92,98:40,408 190:1424 (HZ=1000) barrier: 0/0:0 cbflood: 20
[  240.372086] rcu-torture: Reader Pipe:  2665088804 340 0 0 0 0 0 0 0 0 0
[  240.372086] rcu-torture: Reader Batch:  2662328284 2760860 0 0 0 0 0 0 0 0 0
[  240.373235] rcu-torture: Free-Block Circulation:  181 180 179 176 173 171 170 169 168 167 0
[  240.374150] ??? Writer stall state RTWS_SYNC(7) g114 c113 f0x2
[  240.375523] rcu_preempt: wait state: 3 ->state: 0x100
[  240.376079] rcu_sched: wait state: 1 ->state: 0x1
[  240.376079] rcu_bh: wait state: 1 ->state: 0x1
[  285.192016] INFO: rcu_preempt detected stalls on CPUs/tasks:
[  285.192016] 	13-O.N: (0 ticks this GP) idle=40f/140000000000000/0 softirq=258/258 fqs=1 
[  285.192016] 	(detected by 4, t=273023 jiffies, g=114, c=113, q=8)
[  285.192016] Task dump for CPU 13:
[  285.192016] swapper/13      R  running task    15600     0      1 0x00200000
[  285.192016]  ffff88007ccb4000 0000000000000000 0000000000000000 ffff88007ccb4000
[  285.192016]  0000000000000000 0000000000000000 ffff88007ccb0000 ffff88007ccb3eb8
[  285.192016]  ffffffff813480f3 ffff88007ccb3ee0 ffffffff8103cd18 ffff88007ccb4000
[  285.192016] Call Trace:
[  285.192016]  [<ffffffff813480f3>] ? __this_cpu_preempt_check+0x13/0x20
[  285.192016]  [<ffffffff8103cd18>] ? native_play_dead+0xf8/0x130
[  285.192016]  [<ffffffff8100faea>] ? arch_cpu_idle_dead+0xa/0x10
[  285.192016]  [<ffffffff8108ffed>] ? cpu_startup_entry+0x27d/0x2e0
[  285.192016]  [<ffffffff8103bf29>] ? start_secondary+0xf9/0x100
[  285.192016] rcu_preempt kthread starved for 273027 jiffies! g114 c113 f0x2 RCU_GP_WAIT_FQS(3) ->state=0x100
[  285.192016] rcu_preempt     W ffff88007cc53d08 14696     7      2 0x00000000
[  285.192016]  ffff88007cc53d08 ffff88007fa2cc00 ffff88007c651900 ffff88007cc0cb00
[  285.192016]  ffffffff818b401f 0000000000000001 ffff88007cc54000 ffff88007fa2cc00
[  285.192016]  ffff88007cc53d40 ffff88007fa2cc00 0000000000000003 ffff88007cc53d20
[  285.192016] Call Trace:
[  285.192016]  [<ffffffff818b401f>] ? _raw_spin_lock_irqsave+0x1f/0x30
[  285.192016]  [<ffffffff818afa3a>] schedule+0x3a/0x90
[  285.192016]  [<ffffffff818b35de>] schedule_timeout+0x10e/0x230
[  285.192016]  [<ffffffff818b4189>] ? _raw_spin_unlock_irqrestore+0x19/0x30
[  285.192016]  [<ffffffff810b8dd0>] ? detach_if_pending+0xf0/0xf0
[  285.192016]  [<ffffffff810b3d27>] rcu_gp_kthread+0x957/0x1080
[  285.192016]  [<ffffffff8108c28a>] ? put_prev_task_rt+0x8a/0xb0
[  285.192016]  [<ffffffff818af400>] ? __schedule+0x630/0xb00
[  285.192016]  [<ffffffff8108fa70>] ? wake_atomic_t_function+0x60/0x60
[  285.192016]  [<ffffffff810b33d0>] ? call_rcu_sched+0x20/0x20
[  285.192016]  [<ffffffff810732f6>] kthread+0xd6/0xf0
[  285.192016]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[  285.192016]  [<ffffffff818b499f>] ret_from_fork+0x3f/0x70
[  285.192016]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[  300.376028] rcu-torture: rtc: ffffffff820d6e80 ver: 181 tfle: 0 rta: 182 rtaf: 0 rtf: 167 rtmbe: 0 rtbke: 0 rtbre: 0 rtbf: 0 rtb: 0 nt: 453846 onoff: 2/2:8/9 92,98:40,408 190:1424 (HZ=1000) barrier: 0/0:0 cbflood: 20
[  300.378188] rcu-torture: Reader Pipe:  3305911667 340 0 0 0 0 0 0 0 0 0
[  300.379057] rcu-torture: Reader Batch:  3303151147 2760860 0 0 0 0 0 0 0 0 0
[  300.380041] rcu-torture: Free-Block Circulation:  181 180 179 176 173 171 170 169 168 167 0
[  300.381069] ??? Writer stall state RTWS_SYNC(7) g114 c113 f0x2
[  300.382167] rcu_preempt: wait state: 3 ->state: 0x100
[  300.382167] rcu_sched: wait state: 1 ->state: 0x1
[  300.383324] rcu_bh: wait state: 1 ->state: 0x1
[  348.197029] INFO: rcu_preempt detected stalls on CPUs/tasks:
[  348.197029] 	13-O.N: (0 ticks this GP) idle=40f/140000000000000/0 softirq=258/258 fqs=1 
[  348.197029] 	(detected by 15, t=336028 jiffies, g=114, c=113, q=10)
[  348.197029] Task dump for CPU 13:
[  348.197029] swapper/13      R  running task    15600     0      1 0x00200000
[  348.197029]  ffff88007ccb4000 0000000000000000 0000000000000000 ffff88007ccb4000
[  348.197029]  0000000000000000 0000000000000000 ffff88007ccb0000 ffff88007ccb3eb8
[  348.197029]  ffffffff813480f3 ffff88007ccb3ee0 ffffffff8103cd18 ffff88007ccb4000
[  348.197029] Call Trace:
[  348.197029]  [<ffffffff813480f3>] ? __this_cpu_preempt_check+0x13/0x20
[  348.197029]  [<ffffffff8103cd18>] ? native_play_dead+0xf8/0x130
[  348.197029]  [<ffffffff8100faea>] ? arch_cpu_idle_dead+0xa/0x10
[  348.197029]  [<ffffffff8108ffed>] ? cpu_startup_entry+0x27d/0x2e0
[  348.197029]  [<ffffffff8103bf29>] ? start_secondary+0xf9/0x100
[  348.197029] rcu_preempt kthread starved for 336033 jiffies! g114 c113 f0x2 RCU_GP_WAIT_FQS(3) ->state=0x100
[  348.197029] rcu_preempt     W ffff88007cc53d08 14696     7      2 0x00000000
[  348.197029]  ffff88007cc53d08 ffff88007fa2cc00 ffff88007c651900 ffff88007cc0cb00
[  348.197029]  ffffffff818b401f 0000000000000001 ffff88007cc54000 ffff88007fa2cc00
[  348.197029]  ffff88007cc53d40 ffff88007fa2cc00 0000000000000003 ffff88007cc53d20
[  348.197029] Call Trace:
[  348.197029]  [<ffffffff818b401f>] ? _raw_spin_lock_irqsave+0x1f/0x30
[  348.197029]  [<ffffffff818afa3a>] schedule+0x3a/0x90
[  348.197029]  [<ffffffff818b35de>] schedule_timeout+0x10e/0x230
[  348.197029]  [<ffffffff818b4189>] ? _raw_spin_unlock_irqrestore+0x19/0x30
[  348.197029]  [<ffffffff810b8dd0>] ? detach_if_pending+0xf0/0xf0
[  348.197029]  [<ffffffff810b3d27>] rcu_gp_kthread+0x957/0x1080
[  348.197029]  [<ffffffff8108c28a>] ? put_prev_task_rt+0x8a/0xb0
[  348.197029]  [<ffffffff818af400>] ? __schedule+0x630/0xb00
[  348.197029]  [<ffffffff8108fa70>] ? wake_atomic_t_function+0x60/0x60
[  348.197029]  [<ffffffff810b33d0>] ? call_rcu_sched+0x20/0x20
[  348.197029]  [<ffffffff810732f6>] kthread+0xd6/0xf0
[  348.197029]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[  348.197029]  [<ffffffff818b499f>] ret_from_fork+0x3f/0x70
[  348.197029]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[  360.384765] rcu-torture: rtc: ffffffff820d6e80 ver: 181 tfle: 0 rta: 182 rtaf: 0 rtf: 167 rtmbe: 0 rtbke: 0 rtbre: 0 rtbf: 0 rtb: 0 nt: 540496 onoff: 2/2:8/9 92,98:40,408 190:1424 (HZ=1000) barrier: 0/0:0 cbflood: 20
[  360.386149] rcu-torture: Reader Pipe:  3950833032 340 0 0 0 0 0 0 0 0 0
[  360.387094] rcu-torture: Reader Batch:  3948072512 2760860 0 0 0 0 0 0 0 0 0
[  360.388102] rcu-torture: Free-Block Circulation:  181 180 179 176 173 171 170 169 168 167 0
[  360.389088] ??? Writer stall state RTWS_SYNC(7) g114 c113 f0x2
[  360.390229] rcu_preempt: wait state: 3 ->state: 0x100
[  360.390229] rcu_sched: wait state: 1 ->state: 0x1
[  360.391236] rcu_bh: wait state: 1 ->state: 0x1
[  411.202025] INFO: rcu_preempt detected stalls on CPUs/tasks:
[  411.202025] 	13-O.N: (0 ticks this GP) idle=40f/140000000000000/0 softirq=258/258 fqs=1 
[  411.202025] 	(detected by 10, t=399033 jiffies, g=114, c=113, q=10)
[  411.202025] Task dump for CPU 13:
[  411.202025] swapper/13      R  running task    15600     0      1 0x00200000
[  411.202025]  ffff88007ccb4000 0000000000000000 0000000000000000 ffff88007ccb4000
[  411.202025]  0000000000000000 0000000000000000 ffff88007ccb0000 ffff88007ccb3eb8
[  411.202025]  ffffffff813480f3 ffff88007ccb3ee0 ffffffff8103cd18 ffff88007ccb4000
[  411.202025] Call Trace:
[  411.202025]  [<ffffffff813480f3>] ? __this_cpu_preempt_check+0x13/0x20
[  411.202025]  [<ffffffff8103cd18>] ? native_play_dead+0xf8/0x130
[  411.202025]  [<ffffffff8100faea>] ? arch_cpu_idle_dead+0xa/0x10
[  411.202025]  [<ffffffff8108ffed>] ? cpu_startup_entry+0x27d/0x2e0
[  411.202025]  [<ffffffff8103bf29>] ? start_secondary+0xf9/0x100
[  411.202025] rcu_preempt kthread starved for 399037 jiffies! g114 c113 f0x2 RCU_GP_WAIT_FQS(3) ->state=0x100
[  411.202025] rcu_preempt     W ffff88007cc53d08 14696     7      2 0x00000000
[  411.202025]  ffff88007cc53d08 ffff88007fa2cc00 ffff88007c651900 ffff88007cc0cb00
[  411.202025]  ffffffff818b401f 0000000000000001 ffff88007cc54000 ffff88007fa2cc00
[  411.202025]  ffff88007cc53d40 ffff88007fa2cc00 0000000000000003 ffff88007cc53d20
[  411.202025] Call Trace:
[  411.202025]  [<ffffffff818b401f>] ? _raw_spin_lock_irqsave+0x1f/0x30
[  411.202025]  [<ffffffff818afa3a>] schedule+0x3a/0x90
[  411.202025]  [<ffffffff818b35de>] schedule_timeout+0x10e/0x230
[  411.202025]  [<ffffffff818b4189>] ? _raw_spin_unlock_irqrestore+0x19/0x30
[  411.202025]  [<ffffffff810b8dd0>] ? detach_if_pending+0xf0/0xf0
[  411.202025]  [<ffffffff810b3d27>] rcu_gp_kthread+0x957/0x1080
[  411.202025]  [<ffffffff8108c28a>] ? put_prev_task_rt+0x8a/0xb0
[  411.202025]  [<ffffffff818af400>] ? __schedule+0x630/0xb00
[  411.202025]  [<ffffffff8108fa70>] ? wake_atomic_t_function+0x60/0x60
[  411.202025]  [<ffffffff810b33d0>] ? call_rcu_sched+0x20/0x20
[  411.202025]  [<ffffffff810732f6>] kthread+0xd6/0xf0
[  411.202025]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[  411.202025]  [<ffffffff818b499f>] ret_from_fork+0x3f/0x70
[  411.202025]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[  420.391036] rcu-torture: rtc: ffffffff820d6e80 ver: 181 tfle: 0 rta: 182 rtaf: 0 rtf: 167 rtmbe: 0 rtbke: 0 rtbre: 0 rtbf: 0 rtb: 0 nt: 627073 onoff: 2/2:8/9 92,98:40,408 190:1424 (HZ=1000) barrier: 0/0:0 cbflood: 20
[  420.393089] rcu-torture: Reader Pipe:  4571684909 340 0 0 0 0 0 0 0 0 0
[  420.394037] rcu-torture: Reader Batch:  4568924388 2760860 0 0 0 0 0 0 0 0 0
[  420.395057] rcu-torture: Free-Block Circulation:  181 180 179 176 173 171 170 169 168 167 0
[  420.396078] ??? Writer stall state RTWS_SYNC(7) g114 c113 f0x2
[  420.397239] rcu_preempt: wait state: 3 ->state: 0x100
[  420.397239] rcu_sched: wait state: 1 ->state: 0x1
[  420.398375] rcu_bh: wait state: 1 ->state: 0x1
[  474.207031] INFO: rcu_preempt detected stalls on CPUs/tasks:
[  474.207031] 	13-O.N: (0 ticks this GP) idle=40f/140000000000000/0 softirq=258/258 fqs=1 
[  474.207031] 	(detected by 10, t=462038 jiffies, g=114, c=113, q=10)
[  474.207031] Task dump for CPU 13:
[  474.207031] swapper/13      R  running task    15600     0      1 0x00200000
[  474.207031]  ffff88007ccb4000 0000000000000000 0000000000000000 ffff88007ccb4000
[  474.207031]  0000000000000000 0000000000000000 ffff88007ccb0000 ffff88007ccb3eb8
[  474.207031]  ffffffff813480f3 ffff88007ccb3ee0 ffffffff8103cd18 ffff88007ccb4000
[  474.207031] Call Trace:
[  474.207031]  [<ffffffff813480f3>] ? __this_cpu_preempt_check+0x13/0x20
[  474.207031]  [<ffffffff8103cd18>] ? native_play_dead+0xf8/0x130
[  474.207031]  [<ffffffff8100faea>] ? arch_cpu_idle_dead+0xa/0x10
[  474.207031]  [<ffffffff8108ffed>] ? cpu_startup_entry+0x27d/0x2e0
[  474.207031]  [<ffffffff8103bf29>] ? start_secondary+0xf9/0x100
[  474.207031] rcu_preempt kthread starved for 462043 jiffies! g114 c113 f0x2 RCU_GP_WAIT_FQS(3) ->state=0x100
[  474.207031] rcu_preempt     W ffff88007cc53d08 14696     7      2 0x00000000
[  474.207031]  ffff88007cc53d08 ffff88007fa2cc00 ffff88007c651900 ffff88007cc0cb00
[  474.207031]  ffffffff818b401f 0000000000000001 ffff88007cc54000 ffff88007fa2cc00
[  474.207031]  ffff88007cc53d40 ffff88007fa2cc00 0000000000000003 ffff88007cc53d20
[  474.207031] Call Trace:
[  474.207031]  [<ffffffff818b401f>] ? _raw_spin_lock_irqsave+0x1f/0x30
[  474.207031]  [<ffffffff818afa3a>] schedule+0x3a/0x90
[  474.207031]  [<ffffffff818b35de>] schedule_timeout+0x10e/0x230
[  474.207031]  [<ffffffff818b4189>] ? _raw_spin_unlock_irqrestore+0x19/0x30
[  474.207031]  [<ffffffff810b8dd0>] ? detach_if_pending+0xf0/0xf0
[  474.207031]  [<ffffffff810b3d27>] rcu_gp_kthread+0x957/0x1080
[  474.207031]  [<ffffffff8108c28a>] ? put_prev_task_rt+0x8a/0xb0
[  474.207031]  [<ffffffff818af400>] ? __schedule+0x630/0xb00
[  474.207031]  [<ffffffff8108fa70>] ? wake_atomic_t_function+0x60/0x60
[  474.207031]  [<ffffffff810b33d0>] ? call_rcu_sched+0x20/0x20
[  474.207031]  [<ffffffff810732f6>] kthread+0xd6/0xf0
[  474.207031]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[  474.207031]  [<ffffffff818b499f>] ret_from_fork+0x3f/0x70
[  474.207031]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[  480.398033] rcu-torture: rtc: ffffffff820d6e80 ver: 181 tfle: 0 rta: 182 rtaf: 0 rtf: 167 rtmbe: 0 rtbke: 0 rtbre: 0 rtbf: 0 rtb: 0 nt: 711625 onoff: 2/2:8/9 92,98:40,408 190:1424 (HZ=1000) barrier: 0/0:0 cbflood: 20
[  480.400041] rcu-torture: Reader Pipe:  5186807514 340 0 0 0 0 0 0 0 0 0
[  480.401030] rcu-torture: Reader Batch:  5184046994 2760860 0 0 0 0 0 0 0 0 0
[  480.402062] rcu-torture: Free-Block Circulation:  181 180 179 176 173 171 170 169 168 167 0
[  480.403081] ??? Writer stall state RTWS_SYNC(7) g114 c113 f0x2
[  480.404204] rcu_preempt: wait state: 3 ->state: 0x100
[  480.404204] rcu_sched: wait state: 1 ->state: 0x1
[  480.405376] rcu_bh: wait state: 1 ->state: 0x1
[  537.212067] INFO: rcu_preempt detected stalls on CPUs/tasks:
[  537.212067] 	13-O.N: (0 ticks this GP) idle=40f/140000000000000/0 softirq=258/258 fqs=1 
[  537.212067] 	(detected by 0, t=525042 jiffies, g=114, c=113, q=10)
[  537.212067] Task dump for CPU 13:
[  537.212067] swapper/13      R  running task    15600     0      1 0x00200000
[  537.212067]  ffff88007ccb4000 0000000000000000 0000000000000000 ffff88007ccb4000
[  537.212067]  0000000000000000 0000000000000000 ffff88007ccb0000 ffff88007ccb3eb8
[  537.212067]  ffffffff813480f3 ffff88007ccb3ee0 ffffffff8103cd18 ffff88007ccb4000
[  537.212067] Call Trace:
[  537.212067]  [<ffffffff813480f3>] ? __this_cpu_preempt_check+0x13/0x20
[  537.212067]  [<ffffffff8103cd18>] ? native_play_dead+0xf8/0x130
[  537.212067]  [<ffffffff8100faea>] ? arch_cpu_idle_dead+0xa/0x10
[  537.212067]  [<ffffffff8108ffed>] ? cpu_startup_entry+0x27d/0x2e0
[  537.212067]  [<ffffffff8103bf29>] ? start_secondary+0xf9/0x100
[  537.212067] rcu_preempt kthread starved for 525039 jiffies! g114 c113 f0x2 RCU_GP_WAIT_FQS(3) ->state=0x100
[  537.212067] rcu_preempt     W ffff88007cc53d08 14696     7      2 0x00000000
[  537.212067]  ffff88007cc53d08 ffff88007fa2cc00 ffff88007c651900 ffff88007cc0cb00
[  537.212067]  ffffffff818b401f 0000000000000001 ffff88007cc54000 ffff88007fa2cc00
[  537.212067]  ffff88007cc53d40 ffff88007fa2cc00 0000000000000003 ffff88007cc53d20
[  537.212067] Call Trace:
[  537.212067]  [<ffffffff818b401f>] ? _raw_spin_lock_irqsave+0x1f/0x30
[  537.212067]  [<ffffffff818afa3a>] schedule+0x3a/0x90
[  537.212067]  [<ffffffff818b35de>] schedule_timeout+0x10e/0x230
[  537.212067]  [<ffffffff818b4189>] ? _raw_spin_unlock_irqrestore+0x19/0x30
[  537.212067]  [<ffffffff810b8dd0>] ? detach_if_pending+0xf0/0xf0
[  537.212067]  [<ffffffff810b3d27>] rcu_gp_kthread+0x957/0x1080
[  537.212067]  [<ffffffff8108c28a>] ? put_prev_task_rt+0x8a/0xb0
[  537.212067]  [<ffffffff818af400>] ? __schedule+0x630/0xb00
[  537.212067]  [<ffffffff8108fa70>] ? wake_atomic_t_function+0x60/0x60
[  537.212067]  [<ffffffff810b33d0>] ? call_rcu_sched+0x20/0x20
[  537.212067]  [<ffffffff810732f6>] kthread+0xd6/0xf0
[  537.212067]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[  537.212067]  [<ffffffff818b499f>] ret_from_fork+0x3f/0x70
[  537.212067]  [<ffffffff81073220>] ? kthread_worker_fn+0x180/0x180
[  540.405017] rcu-torture: rtc: ffffffff820d6e80 ver: 181 tfle: 0 rta: 182 rtaf: 0 rtf: 167 rtmbe: 0 rtbke: 0 rtbre: 0 rtbf: 0 rtb: 0 nt: 799336 onoff: 2/2:8/9 92,98:40,408 190:1424 (HZ=1000) barrier: 0/0:0 cbflood: 20
[  540.406051] rcu-torture: Reader Pipe:  5823840140 340 0 0 0 0 0 0 0 0 0
[  540.407049] rcu-torture: Reader Batch:  5821079620 2760860 0 0 0 0 0 0 0 0 0
[  540.407049] rcu-torture: Free-Block Circulation:  181 180 179 176 173 171 170 169 168 167 0
[  540.408141] ??? Writer stall state RTWS_SYNC(7) g114 c113 f0x2
[  540.409211] rcu_preempt: wait state: 3 ->state: 0x100
[  540.409211] rcu_sched: wait state: 1 ->state: 0x1
[  540.409211] rcu_bh: wait state: 1 ->state: 0x1

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