Re: [ANNOUNCE] v4.11.12-rt9

[Mike Galbraith <efault@gmx.de>]

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On Sat, 2017-08-05 at 08:13 +0200, Mike Galbraith wrote:
> On Fri, 2017-08-04 at 19:38 +0200, Sebastian Andrzej Siewior wrote:
> > Dear RT folks!
> > 
> > I'm pleased to announce the v4.11.12-rt9 patch set. 
> > 
> > Changes since v4.11.12-rt8:
> > 
> >   - CPU hotplug could be rock solid now. Yes. The rewrite of the hotplug
> >     related parts for RT including rwlock's implementation over the last
> >     few weeks looks good. 'good' means that Steven's CPU-hotplug test script
> >     run a x86 box with two nodes without hanging for over a week.
> 
> Woohoo!

Box put a small dent in enthusiasm.  After a bit of hotplug flogging,
box blew up on shutdown.  x3550 M3 has a serial port, and reproduced.

[  624.216065] list_del corruption. prev->next should be ffff88015cb31278, but was ffff88017f0945a0
[  624.216077] ------------[ cut here ]------------
[  624.216079] kernel BUG at lib/list_debug.c:53!
[  624.216080] invalid opcode: 0000 [#1] PREEMPT SMP
[  624.216085] Dumping ftrace buffer:
[  624.216090]    (ftrace buffer empty)
[  624.216091] Modules linked in: ebtable_filter(E) ebtables(E) ip6table_filter(E) ip6_tables(E) iptable_filter(E) ip_tables(E) x_tables(E) af_packet(E) br_netfilter(E) bridge(E) stp(E) llc(E) iscsi_ibft(E) iscsi_boot_sysfs(E) intel_powerclamp(E) coretemp(E) kvm_intel(E) nls_iso8859_1(E) nls_cp437(E) kvm(E) vfat(E) fat(E) ipmi_ssif(E) irqbypass(E) cdc_ether(E) crct10dif_pclmul(E) usbnet(E) crc32_pclmul(E) mii(E) crc32c_intel(E) ghash_clmulni_intel(E) ipmi_si(E) pcbc(E) ipmi_devintf(E) iTCO_wdt(E) iTCO_vendor_support(E) aesni_intel(E) ipmi_msghandler(E) bnx2(E) aes_x86_64(E) i7core_edac(E) i5500_temp(E) crypto_simd(E) ioatdma(E) lpc_ich(E) glue_helper(E) edac_core(E) dca(E) mfd_core(E) shpchp(E) cryptd(E) button(E) acpi_cpufreq(E) i2c_i801(E) pcspkr(E) nfsd(E) auth_rpcgss(E) nfs_acl(E) lockd(E) grace(E)
[  624.216131]  sunrpc(E) ext4(E) crc16(E) jbd2(E) mbcache(E) sd_mod(E) ehci_pci(E) uhci_hcd(E) i2c_algo_bit(E) ata_generic(E) drm_kms_helper(E) syscopyarea(E) sysfillrect(E) sysimgblt(E) ehci_hcd(E) fb_sys_fops(E) ata_piix(E) ttm(E) ahci(E) libahci(E) drm(E) megaraid_sas(E) libata(E) usbcore(E) sg(E) dm_multipath(E) dm_mod(E) scsi_dh_rdac(E) scsi_dh_emc(E) scsi_dh_alua(E) scsi_mod(E) efivarfs(E) autofs4(E)
[  624.216155] CPU: 0 PID: 2584 Comm: ntpd Tainted: G        W   E   4.11.12-rt9-virgin #1
[  624.216156] Hardware name: IBM System x3550 M3 -[7944K3G]-/69Y5698     , BIOS -[D6E150AUS-1.10]- 12/15/2010
[  624.216158] task: ffff880143fc6000 task.stack: ffffc90003b18000
[  624.216164] RIP: 0010:__list_del_entry_valid+0x7b/0x90
[  624.216165] RSP: 0018:ffffc90003b1be18 EFLAGS: 00010096
[  624.216167] RAX: 0000000000000054 RBX: ffff88015cb31240 RCX: 0000000000000000
[  624.216168] RDX: ffff880143fc6000 RSI: 0000000000000000 RDI: ffffffff810f552b
[  624.216169] RBP: ffffc90003b1be18 R08: 0000000000000001 R09: 0000000000000000
[  624.216170] R10: 000000000000201f R11: 0000000000000000 R12: ffff88017f094580
[  624.216172] R13: ffff88017f094440 R14: ffff88017f094440 R15: ffff88015cb31278
[  624.216173] FS:  00007f63dcde4700(0000) GS:ffff88017f000000(0000) knlGS:0000000000000000
[  624.216175] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  624.216176] CR2: 00007f63dbd11080 CR3: 000000016510c000 CR4: 00000000000006f0
[  624.216178] Call Trace:
[  624.216184]  __remove_hrtimer+0xac/0xd0
[  624.216188]  hrtimer_try_to_cancel+0xd2/0x220
[  624.216191]  hrtimer_cancel+0x1f/0x30
[  624.216195]  do_exit+0x742/0xd60
[  624.216200]  ? entry_SYSCALL_64_fastpath+0x5/0xc2
[  624.216205]  ? trace_hardirqs_on_caller+0xf9/0x1c0
[  624.216208]  do_group_exit+0x4c/0xc0
[  624.216211]  SyS_exit_group+0x14/0x20
[  624.216214]  entry_SYSCALL_64_fastpath+0x1f/0xc2
[  624.216216] RIP: 0033:0x7f63dbfd04a9
[  624.216217] RSP: 002b:00007ffdb1e96568 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
[  624.216219] RAX: ffffffffffffffda RBX: 00007f63dcde6000 RCX: 00007f63dbfd04a9
[  624.216220] RDX: 0000000000000000 RSI: 00007f63dc2b4303 RDI: 0000000000000000
[  624.216221] RBP: 00007ffdb1e96560 R08: 000000000000003c R09: 00000000000000e7
[  624.216223] R10: ffffffffffffff90 R11: 0000000000000246 R12: 00007f63dbd10b70
[  624.216224] R13: 00007ffdb1e964d0 R14: 00007ffdb1e964e8 R15: 0000000000000000
[  624.216230] Code: e8 82 45 dd ff 0f 0b 48 89 fe 31 c0 48 c7 c7 28 05 a5 81 e8 6f 45 dd ff 0f 0b 48 89 fe 31 c0 48 c7 c7 e8 04 a5 81 e8 5c 45 dd ff <0f> 0b 48 89 fe 31 c0 48 c7 c7 b0 04 a5 81 e8 49 45 dd ff 0f 0b 
[  624.216266] RIP: __list_del_entry_valid+0x7b/0x90 RSP: ffffc90003b1be18

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