Hello,

got the splat below when running powertop on plain v3.10-rc1
(i.e. without my previously mentioned revert patch or any other extra
patches).  Config attached.



[   45.376480] ------------[ cut here ]------------
[   45.378453] WARNING: at kernel/rcutree.c:502 rcu_eqs_exit_common.isra.48+0x3d/0x125()
[   45.380423] Modules linked in: msr cpufreq_stats xt_multiport iptable_filter ip_tables rfcomm bnep xt_hl binfmt_misc ip6table_filter ip6_tables x_tables nfsd nfs_acl nfs lockd fscache sunrpc 8021q garp stp llc tun loop fuse cdc_mbim cdc_ncm cdc_wdm usbnet mii snd_hda_codec_conexant arc4 iwldvm iTCO_wdt mac80211 iTCO_vendor_support snd_hda_intel snd_hda_codec snd_hwdep snd_pcm_oss snd_mixer_oss snd_pcm snd_page_alloc thinkpad_acpi nvram snd_seq_midi snd_seq_midi_event snd_rawmidi uvcvideo coretemp videobuf2_vmalloc snd_seq videobuf2_memops videobuf2_core kvm_intel i915 videodev iwlwifi i2c_algo_bit drm_kms_helper kvm snd_seq_device evdev psmouse snd_timer serio_raw cfg80211 lpc_ich btusb drm mfd_core i2c_i801 bluetooth i2c_core snd wmi soundcore battery rfkill ac acpi_cpufreq mperf video processor button ext4 crc16 jbd2 mbcache nbd sg sr_mod sd_mod crc_t10dif cdrom ahci libahci microcode libata scsi_mod thermal thermal_sys ehci_pci uhci_hcd ehci_hcd usbcore e1000e ptp pps_core usb_common
[   45.380462] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 3.10.0-rc1 #86
[   45.380462] Hardware name: LENOVO 2776LEG/2776LEG, BIOS 6EET55WW (3.15 ) 12/19/2011
[   45.380462]  ffffffff8157d888 ffffffff81801e28 ffffffff8137e4e3 ffffffff81801e68
[   45.380462]  ffffffff8103094f ffffffff81801e68 0000000000000000 ffff88023afcd9b0
[   45.380462]  0000000000000000 0140000000000000 ffff88023bee7780 ffffffff81801e78
[   45.380462] Call Trace:
[   45.380462]  [<ffffffff8137e4e3>] dump_stack+0x19/0x1b
[   45.380462]  [<ffffffff8103094f>] warn_slowpath_common+0x62/0x7b
[   45.380462]  [<ffffffff8103097d>] warn_slowpath_null+0x15/0x17
[   45.380462]  [<ffffffff810a9006>] rcu_eqs_exit_common.isra.48+0x3d/0x125
[   45.380462]  [<ffffffff81079b49>] ? trace_hardirqs_off_caller+0x37/0xa6
[   45.380462]  [<ffffffff810a9692>] rcu_idle_exit+0x85/0xa8
[   45.380462]  [<ffffffff8107076e>] trace_cpu_idle_rcuidle+0xae/0xff
[   45.380462]  [<ffffffff810708ab>] cpu_startup_entry+0x6c/0x115
[   45.380462]  [<ffffffff813689e5>] rest_init+0x149/0x150
[   45.380462]  [<ffffffff8136889c>] ? csum_partial_copy_generic+0x16c/0x16c
[   45.380462]  [<ffffffff81a82d34>] start_kernel+0x3f0/0x3fd
[   45.380462]  [<ffffffff81a8274c>] ? repair_env_string+0x5a/0x5a
[   45.380462]  [<ffffffff81a82481>] x86_64_start_reservations+0x2a/0x2c
[   45.380462]  [<ffffffff81a82550>] x86_64_start_kernel+0xcd/0xd1
[   45.380462] ---[ end trace 99f147d3a7347ae6 ]---
[   45.380462] 
[   45.380462] ===============================
[   45.380462] [ INFO: suspicious RCU usage. ]
[   45.380462] 3.10.0-rc1 #86 Tainted: G        W   
[   45.380462] -------------------------------
[   45.380462] include/trace/events/power.h:35 suspicious rcu_dereference_check() usage!
[   45.380462] 
[   45.380462] other info that might help us debug this:
[   45.380462] 
[   45.380462] 
[   45.380462] RCU used illegally from idle CPU!
[   45.380462] rcu_scheduler_active = 1, debug_locks = 1
[   45.380462] RCU used illegally from extended quiescent state!
[   45.380462] no locks held by swapper/0/0.
[   45.380462] 
[   45.380462] stack backtrace:
[   45.380462] CPU: 0 PID: 0 Comm: swapper/0 Tainted: G        W    3.10.0-rc1 #86
[   45.380462] Hardware name: LENOVO 2776LEG/2776LEG, BIOS 6EET55WW (3.15 ) 12/19/2011
[   45.380462]  0000000000000001 ffffffff81801eb8 ffffffff8137e4e3 ffffffff81801ee8
[   45.380462]  ffffffff8107b216 ffff880227b386d0 0000000000000000 0000000000000000
[   45.380462]  ffff88023bee7780 ffffffff81801f18 ffffffff810707b2 ffffffff81801fd8
[   45.380462] Call Trace:
[   45.380462]  [<ffffffff8137e4e3>] dump_stack+0x19/0x1b
[   45.380462]  [<ffffffff8107b216>] lockdep_rcu_suspicious+0xfc/0x105
[   45.380462]  [<ffffffff810707b2>] trace_cpu_idle_rcuidle+0xf2/0xff
[   45.380462]  [<ffffffff810708ab>] cpu_startup_entry+0x6c/0x115
[   45.380462]  [<ffffffff813689e5>] rest_init+0x149/0x150
[   45.380462]  [<ffffffff8136889c>] ? csum_partial_copy_generic+0x16c/0x16c
[   45.380462]  [<ffffffff81a82d34>] start_kernel+0x3f0/0x3fd
[   45.380462]  [<ffffffff81a8274c>] ? repair_env_string+0x5a/0x5a
[   45.380462]  [<ffffffff81a82481>] x86_64_start_reservations+0x2a/0x2c
[   45.380462]  [<ffffffff81a82550>] x86_64_start_kernel+0xcd/0xd1
[   45.380462] 
[   45.380462] ===============================
[   45.380462] [ INFO: suspicious RCU usage. ]
[   45.380462] 3.10.0-rc1 #86 Tainted: G        W   
[   45.380462] -------------------------------
[   45.380462] include/linux/rcupdate.h:771 rcu_read_lock() used illegally while idle!
[   45.380462] 
[   45.380462] other info that might help us debug this:
[   45.380462] 
[   45.380462] 
[   45.380462] RCU used illegally from idle CPU!
[   45.380462] rcu_scheduler_active = 1, debug_locks = 1
[   45.380462] RCU used illegally from extended quiescent state!
[   45.380462] 1 lock held by swapper/0/0:
[   45.380462]  #0:  (rcu_read_lock){.+.+..}, at: [<ffffffff810c242b>] rcu_lock_acquire+0x0/0x29
[   45.557431] 
[   45.557432] ===============================
[   45.557433] [ INFO: suspicious RCU usage. ]
[   45.557435] 3.10.0-rc1 #86 Tainted: G        W   
[   45.557436] -------------------------------
[   45.557438] include/linux/rcupdate.h:771 rcu_read_lock() used illegally while idle!
[   45.557439] 
[   45.557439] other info that might help us debug this:
[   45.557439] 
[   45.557441] 
[   45.557441] RCU used illegally from idle CPU!
[   45.557441] rcu_scheduler_active = 1, debug_locks = 1
[   45.557443] RCU used illegally from extended quiescent state!
[   45.557444] 2 locks held by swapper/1/0:
[   45.557453]  #0:  (rcu_read_lock){.+.+..}, at: [<ffffffff810c242b>] rcu_lock_acquire+0x0/0x29
[   45.557461]  #1:  (rcu_read_lock){.+.+..}, at: [<ffffffff810cabac>] perf_output_begin+0x0/0x2be
[   45.557462] 
[   45.557462] stack backtrace:
[   45.557465] CPU: 1 PID: 0 Comm: swapper/1 Tainted: G        W    3.10.0-rc1 #86
[   45.557467] Hardware name: LENOVO 2776LEG/2776LEG, BIOS 6EET55WW (3.15 ) 12/19/2011
[   45.557472]  0000000000000001 ffff88023251db28 ffffffff8137e4e3 ffff88023251db58
[   45.557476]  ffffffff8107b216 ffff880216171800 ffff88023251dc68 ffff88023251dd30
[   45.557480]  0000000000000030 ffff88023251dc48 ffffffff810cac38 ffffffff810cabac
[   45.557481] Call Trace:
[   45.557485]  [<ffffffff8137e4e3>] dump_stack+0x19/0x1b
[   45.557489]  [<ffffffff8107b216>] lockdep_rcu_suspicious+0xfc/0x105
[   45.557493]  [<ffffffff810cac38>] perf_output_begin+0x8c/0x2be
[   45.557496]  [<ffffffff810cabac>] ? perf_output_copy+0x74/0x74
[   45.557500]  [<ffffffff81079b49>] ? trace_hardirqs_off_caller+0x37/0xa6
[   45.557504]  [<ffffffff81079bc5>] ? trace_hardirqs_off+0xd/0xf
[   45.557510]  [<ffffffff810603b8>] ? local_clock+0x2b/0x3c
[   45.557515]  [<ffffffff810c273a>] ? __perf_event_header__init_id+0x5c/0xbc
[   45.557518]  [<ffffffff810c7ecc>] ? perf_prepare_sample+0x57/0x283
[   45.557522]  [<ffffffff810c8255>] __perf_event_overflow+0x15d/0x1c2
[   45.557526]  [<ffffffff810c841d>] perf_swevent_overflow+0x41/0x5b
[   45.557530]  [<ffffffff810c84a8>] perf_swevent_event+0x71/0x73
[   45.557533]  [<ffffffff810c8c28>] perf_tp_event+0xd7/0x24c
[   45.557537]  [<ffffffff810603b8>] ? local_clock+0x2b/0x3c
[   45.557542]  [<ffffffff810c0f25>] perf_trace_cpu+0x8b/0x99
[   45.557546]  [<ffffffff810c0ebf>] ? perf_trace_cpu+0x25/0x99
[   45.557550]  [<ffffffff8107074f>] trace_cpu_idle_rcuidle+0x8f/0xff
[   45.557553]  [<ffffffff810708ab>] cpu_startup_entry+0x6c/0x115
[   45.557557]  [<ffffffff8137224e>] start_secondary+0x261/0x263
[   45.557559] 
[   45.557560] ===============================
[   45.557561] [ INFO: suspicious RCU usage. ]
[   45.557562] 3.10.0-rc1 #86 Tainted: G        W   
[   45.557563] -------------------------------
[   45.557565] kernel/events/ring_buffer.c:132 suspicious rcu_dereference_check() usage!
[   45.557566] 
[   45.557566] other info that might help us debug this:
[   45.557566] 
[   45.557568] 
[   45.557568] RCU used illegally from idle CPU!
[   45.557568] rcu_scheduler_active = 1, debug_locks = 1
[   45.557569] RCU used illegally from extended quiescent state!
[   45.557570] 2 locks held by swapper/1/0:
[   45.557578]  #0:  (rcu_read_lock){.+.+..}, at: [<ffffffff810c242b>] rcu_lock_acquire+0x0/0x29
[   45.557584]  #1:  (rcu_read_lock){.+.+..}, at: [<ffffffff810cabac>] perf_output_begin+0x0/0x2be
[   45.557585] 
[   45.557585] stack backtrace:
[   45.557588] CPU: 1 PID: 0 Comm: swapper/1 Tainted: G        W    3.10.0-rc1 #86
[   45.557589] Hardware name: LENOVO 2776LEG/2776LEG, BIOS 6EET55WW (3.15 ) 12/19/2011
[   45.557594]  0000000000000001 ffff88023251db28 ffffffff8137e4e3 ffff88023251db58
[   45.557598]  ffffffff8107b216 ffff880216171000 ffff88023251dc68 ffff880216171800
[   45.557602]  0000000000000030 ffff88023251dc48 ffffffff810caca9 ffffffff810cabac
[   45.557603] Call Trace:
[   45.557606]  [<ffffffff8137e4e3>] dump_stack+0x19/0x1b
[   45.557610]  [<ffffffff8107b216>] lockdep_rcu_suspicious+0xfc/0x105
[   45.557614]  [<ffffffff810caca9>] perf_output_begin+0xfd/0x2be
[   45.557617]  [<ffffffff810cabac>] ? perf_output_copy+0x74/0x74
[   45.557621]  [<ffffffff81079b49>] ? trace_hardirqs_off_caller+0x37/0xa6
[   45.557624]  [<ffffffff81079bc5>] ? trace_hardirqs_off+0xd/0xf
[   45.557628]  [<ffffffff810603b8>] ? local_clock+0x2b/0x3c
[   45.557632]  [<ffffffff810c273a>] ? __perf_event_header__init_id+0x5c/0xbc
[   45.557636]  [<ffffffff810c7ecc>] ? perf_prepare_sample+0x57/0x283
[   45.557640]  [<ffffffff810c8255>] __perf_event_overflow+0x15d/0x1c2
[   45.557644]  [<ffffffff810c841d>] perf_swevent_overflow+0x41/0x5b
[   45.557647]  [<ffffffff810c84a8>] perf_swevent_event+0x71/0x73
[   45.557651]  [<ffffffff810c8c28>] perf_tp_event+0xd7/0x24c
[   45.557655]  [<ffffffff810603b8>] ? local_clock+0x2b/0x3c
[   45.557659]  [<ffffffff810c0f25>] perf_trace_cpu+0x8b/0x99
[   45.557663]  [<ffffffff810c0ebf>] ? perf_trace_cpu+0x25/0x99
[   45.557666]  [<ffffffff8107074f>] trace_cpu_idle_rcuidle+0x8f/0xff
[   45.557670]  [<ffffffff810708ab>] cpu_startup_entry+0x6c/0x115
[   45.557673]  [<ffffffff8137224e>] start_secondary+0x261/0x263
[   45.557676] 
[   45.557677] ===============================
[   45.557677] [ INFO: suspicious RCU usage. ]
[   45.557679] 3.10.0-rc1 #86 Tainted: G        W   
[   45.557680] -------------------------------
[   45.557682] include/linux/rcupdate.h:792 rcu_read_unlock() used illegally while idle!
[   45.557683] 
[   45.557683] other info that might help us debug this:
[   45.557683] 
[   45.557684] 
[   45.557684] RCU used illegally from idle CPU!
[   45.557684] rcu_scheduler_active = 1, debug_locks = 1
[   45.557685] RCU used illegally from extended quiescent state!
[   45.557687] 2 locks held by swapper/1/0:
[   45.557694]  #0:  (rcu_read_lock){.+.+..}, at: [<ffffffff810c242b>] rcu_lock_acquire+0x0/0x29
[   45.557700]  #1:  (rcu_read_lock){.+.+..}, at: [<ffffffff810cabac>] perf_output_begin+0x0/0x2be
[   45.557701] 
[   45.557701] stack backtrace:
[   45.557704] CPU: 1 PID: 0 Comm: swapper/1 Tainted: G        W    3.10.0-rc1 #86
[   45.557705] Hardware name: LENOVO 2776LEG/2776LEG, BIOS 6EET55WW (3.15 ) 12/19/2011
[   45.557710]  0000000000000001 ffff88023251dbf8 ffffffff8137e4e3 ffff88023251dc28
[   45.557714]  ffffffff8107b216 ffff880216171800 0000000000000000 ffff88023251dd30
[   45.557718]  ffff88023251de10 ffff88023251dc38 ffffffff810caac8 ffff88023251dc48
[   45.557719] Call Trace:
[   45.557722]  [<ffffffff8137e4e3>] dump_stack+0x19/0x1b
[   45.557726]  [<ffffffff8107b216>] lockdep_rcu_suspicious+0xfc/0x105
[   45.557730]  [<ffffffff810caac8>] rcu_read_unlock+0x3e/0x67
[   45.557733]  [<ffffffff810caecf>] perf_output_end+0xe/0x10
[   45.557737]  [<ffffffff810c8275>] __perf_event_overflow+0x17d/0x1c2
[   45.557741]  [<ffffffff810c841d>] perf_swevent_overflow+0x41/0x5b
[   45.557744]  [<ffffffff810c84a8>] perf_swevent_event+0x71/0x73
[   45.557748]  [<ffffffff810c8c28>] perf_tp_event+0xd7/0x24c
[   45.557752]  [<ffffffff810603b8>] ? local_clock+0x2b/0x3c
[   45.557756]  [<ffffffff810c0f25>] perf_trace_cpu+0x8b/0x99
[   45.557760]  [<ffffffff810c0ebf>] ? perf_trace_cpu+0x25/0x99
[   45.557764]  [<ffffffff8107074f>] trace_cpu_idle_rcuidle+0x8f/0xff
[   45.557768]  [<ffffffff810708ab>] cpu_startup_entry+0x6c/0x115
[   45.557771]  [<ffffffff8137224e>] start_secondary+0x261/0x263
[   45.557773] 
[   45.557774] ===============================
[   45.557775] [ INFO: suspicious RCU usage. ]
[   45.557777] 3.10.0-rc1 #86 Tainted: G        W   
[   45.557778] -------------------------------
[   45.557779] include/linux/rcupdate.h:792 rcu_read_unlock() used illegally while idle!
[   45.557780] 
[   45.557780] other info that might help us debug this:
[   45.557780] 
[   45.557782] 
[   45.557782] RCU used illegally from idle CPU!
[   45.557782] rcu_scheduler_active = 1, debug_locks = 1
[   45.557783] RCU used illegally from extended quiescent state!
[   45.557785] 1 lock held by swapper/1/0:
[   45.557791]  #0:  (rcu_read_lock){.+.+..}, at: [<ffffffff810c242b>] rcu_lock_acquire+0x0/0x29
[   45.557792] 
[   45.557792] stack backtrace:
[   45.557795] CPU: 1 PID: 0 Comm: swapper/1 Tainted: G        W    3.10.0-rc1 #86
[   45.557796] Hardware name: LENOVO 2776LEG/2776LEG, BIOS 6EET55WW (3.15 ) 12/19/2011
[   45.557801]  0000000000000001 ffff88023251dc08 ffffffff8137e4e3 ffff88023251dc38
[   45.557804]  ffffffff8107b216 ffff880216171800 0000000000000000 ffff88023251dd30
[   45.557808]  ffff88023251de10 ffff88023251dc48 ffffffff810c4ad0 ffff88023251dcc8
[   45.557809] Call Trace:
[   45.557813]  [<ffffffff8137e4e3>] dump_stack+0x19/0x1b
[   45.557817]  [<ffffffff8107b216>] lockdep_rcu_suspicious+0xfc/0x105
[   45.557821]  [<ffffffff810c4ad0>] rcu_read_unlock+0x3e/0x67
[   45.557824]  [<ffffffff810c827a>] __perf_event_overflow+0x182/0x1c2
[   45.557829]  [<ffffffff810c841d>] perf_swevent_overflow+0x41/0x5b
[   45.557832]  [<ffffffff810c84a8>] perf_swevent_event+0x71/0x73
[   45.557836]  [<ffffffff810c8c28>] perf_tp_event+0xd7/0x24c
[   45.557840]  [<ffffffff810603b8>] ? local_clock+0x2b/0x3c
[   45.557844]  [<ffffffff810c0f25>] perf_trace_cpu+0x8b/0x99
[   45.557848]  [<ffffffff810c0ebf>] ? perf_trace_cpu+0x25/0x99
[   45.557852]  [<ffffffff8107074f>] trace_cpu_idle_rcuidle+0x8f/0xff
[   45.557856]  [<ffffffff810708ab>] cpu_startup_entry+0x6c/0x115
[   45.557859]  [<ffffffff8137224e>] start_secondary+0x261/0x263
[   45.557864] ------------[ cut here ]------------



Bjørn