Bug 744839

Summary:	possible circular locking dependency detected
Product:	[Fedora] Fedora	Reporter:	kevin martin <ktmdms>
Component:	kernel	Assignee:	Kernel Maintainer List <kernel-maint>
Status:	CLOSED DUPLICATE	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	rawhide	CC:	gansalmon, itamar, jonathan, kernel-maint, madhu.chinakonda
Target Milestone:	---
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2011-11-07 23:18:47 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:

Description kevin martin 2011-10-10 15:53:55 UTC

Description of problem:
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802515] 
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802518] =======================================================
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802523] [ INFO: possible circular locking dependency detected ]
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802526] 3.1.0-0.rc9.git0.1.fc17.x86_64 #1
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802528] -------------------------------------------------------
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802531] chrome/1830 is trying to acquire lock:
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802534]  (&(&sig->cputimer.lock)->rlock){......}, at: [<ffffffff81047ff5>] account_group_exec_runtime+0x31/0x48
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802548] 
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802549] but task is already holding lock:
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802551]  (&rq->lock){-.-.-.}, at: [<ffffffff81502176>] __schedule+0xee/0x761
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802560] 
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802561] which lock already depends on the new lock.
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802562] 
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802564] 
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802564] the existing dependency chain (in reverse order) is:
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802566] 
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802567] -> #2 (&rq->lock){-.-.-.}:
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802572]        [<ffffffff8108f037>] lock_acquire+0xf3/0x13e
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802579]        [<ffffffff81504555>] _raw_spin_lock+0x45/0x79
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802585]        [<ffffffff810481f7>] __task_rq_lock+0x5e/0x8b
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802590]        [<ffffffff81054046>] wake_up_new_task+0x46/0x10d
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802597]        [<ffffffff8105b8d4>] do_fork+0x22a/0x30e
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802603]        [<ffffffff81015dc4>] kernel_thread+0x75/0x77
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802610]        [<ffffffff814e00ad>] rest_init+0x31/0xde
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802617]        [<ffffffff81d53bb0>] start_kernel+0x3dd/0x3ea
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802625]        [<ffffffff81d532c4>] x86_64_start_reservations+0xaf/0xb3
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802630]        [<ffffffff81d533ca>] x86_64_start_kernel+0x102/0x111
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802634] 
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802635] -> #1 (&p->pi_lock){-.-.-.}:
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802640]        [<ffffffff8108f037>] lock_acquire+0xf3/0x13e
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802645]        [<ffffffff815046f1>] _raw_spin_lock_irqsave+0x54/0x8e
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802650]        [<ffffffff8107c24c>] thread_group_cputimer+0x32/0xbd
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802655]        [<ffffffff8107c302>] cpu_timer_sample_group+0x2b/0x75
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802659]        [<ffffffff8107d2c4>] set_process_cpu_timer+0x36/0xe0
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802664]        [<ffffffff81060d45>] set_cpu_itimer+0x122/0x194
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802669]        [<ffffffff810611bc>] do_setitimer+0x1f7/0x208
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802673]        [<ffffffff8106129b>] sys_setitimer+0x6e/0xaf
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802678]        [<ffffffff8150bcc2>] system_call_fastpath+0x16/0x1b
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802685] 
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802685] -> #0 (&(&sig->cputimer.lock)->rlock){......}:
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802691]        [<ffffffff8108e857>] __lock_acquire+0xa2f/0xd0c
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802696]        [<ffffffff8108f037>] lock_acquire+0xf3/0x13e
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802699]        [<ffffffff81504555>] _raw_spin_lock+0x45/0x79
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802704]        [<ffffffff81047ff5>] account_group_exec_runtime+0x31/0x48
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802709]        [<ffffffff8104cfa8>] update_curr+0x112/0x134
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802714]        [<ffffffff8104d510>] put_prev_task_fair+0x27/0x84
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802719]        [<ffffffff81502478>] __schedule+0x3f0/0x761
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802723]        [<ffffffff81056b86>] __cond_resched+0x28/0x34
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802728]        [<ffffffff81502845>] _cond_resched+0x19/0x22
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802733]        [<ffffffff8112f019>] slab_pre_alloc_hook+0x3b/0x54
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802739]        [<ffffffff81131858>] kmem_cache_alloc_trace+0x29/0xca
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802744]        [<ffffffff811a064b>] sysfs_open_file+0xe8/0x222
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802751]        [<ffffffff8114086b>] __dentry_open+0x277/0x431
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802756]        [<ffffffff81141a59>] nameidata_to_filp+0x68/0x6f
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802761]        [<ffffffff8114f02b>] do_last+0x442/0x592
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802768]        [<ffffffff8114f280>] path_openat+0xd2/0x326
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802772]        [<ffffffff8114f52c>] do_filp_open+0x38/0x86
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802776]        [<ffffffff81141ace>] do_sys_open+0x6e/0x100
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802779]        [<ffffffff81141b80>] sys_open+0x20/0x22
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802783]        [<ffffffff8150bcc2>] system_call_fastpath+0x16/0x1b
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802788] 
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802788] other info that might help us debug this:
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802789] 
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802791] Chain exists of:
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802792]   &(&sig->cputimer.lock)->rlock --> &p->pi_lock --> &rq->lock
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802800] 
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802802]  Possible unsafe locking scenario:
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802803] 
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802805]        CPU0                    CPU1
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802807]        ----                    ----
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802809]   lock(&rq->lock);
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802813]                                lock(&p->pi_lock);
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802817]                                lock(&rq->lock);
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802821]   lock(&(&sig->cputimer.lock)->rlock);
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802825] 
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802826]  *** DEADLOCK ***
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802826] 
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802829] 2 locks held by chrome/1830:
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802831]  #0:  (s_active#131){.+.+.+}, at: [<ffffffff811a059a>] sysfs_open_file+0x37/0x222
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802841]  #1:  (&rq->lock){-.-.-.}, at: [<ffffffff81502176>] __schedule+0xee/0x761
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802848] 
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802849] stack backtrace:
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802853] Pid: 1830, comm: chrome Not tainted 3.1.0-0.rc9.git0.1.fc17.x86_64 #1
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802856] Call Trace:
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802863]  [<ffffffff814fa7cb>] print_circular_bug+0x1f8/0x209
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802868]  [<ffffffff8108e857>] __lock_acquire+0xa2f/0xd0c
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802872]  [<ffffffff8108ea85>] ? __lock_acquire+0xc5d/0xd0c
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802877]  [<ffffffff81047ff5>] ? account_group_exec_runtime+0x31/0x48
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802881]  [<ffffffff8108f037>] lock_acquire+0xf3/0x13e
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802886]  [<ffffffff81047ff5>] ? account_group_exec_runtime+0x31/0x48
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802891]  [<ffffffff81504555>] _raw_spin_lock+0x45/0x79
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802896]  [<ffffffff81047ff5>] ? account_group_exec_runtime+0x31/0x48
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802901]  [<ffffffff81047ff5>] account_group_exec_runtime+0x31/0x48
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802906]  [<ffffffff8104cfa8>] update_curr+0x112/0x134
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802910]  [<ffffffff8104d510>] put_prev_task_fair+0x27/0x84
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802914]  [<ffffffff81502478>] __schedule+0x3f0/0x761
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802922]  [<ffffffff8108ad53>] ? arch_local_irq_restore+0x6/0xd
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802926]  [<ffffffff811a064b>] ? sysfs_open_file+0xe8/0x222
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802931]  [<ffffffff81056b86>] __cond_resched+0x28/0x34
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802936]  [<ffffffff81502845>] _cond_resched+0x19/0x22
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802940]  [<ffffffff8112f019>] slab_pre_alloc_hook+0x3b/0x54
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802944]  [<ffffffff81131858>] kmem_cache_alloc_trace+0x29/0xca
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802949]  [<ffffffff811a064b>] sysfs_open_file+0xe8/0x222
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802953]  [<ffffffff811a0563>] ? sysfs_poll+0x8a/0x8a
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802957]  [<ffffffff8114086b>] __dentry_open+0x277/0x431
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802962]  [<ffffffff81141a59>] nameidata_to_filp+0x68/0x6f
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802967]  [<ffffffff8114f02b>] do_last+0x442/0x592
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802971]  [<ffffffff8114f280>] path_openat+0xd2/0x326
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802975]  [<ffffffff810152b7>] ? native_sched_clock+0x34/0x36
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802979]  [<ffffffff8114f52c>] do_filp_open+0x38/0x86
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802984]  [<ffffffff81504f23>] ? _raw_spin_unlock+0x28/0x3b
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802990]  [<ffffffff81159c7d>] ? alloc_fd+0x176/0x188
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802995]  [<ffffffff81141ace>] do_sys_open+0x6e/0x100
Oct 10 09:57:10 ktmtoshiba kernel: [  104.802999]  [<ffffffff81141b80>] sys_open+0x20/0x22
Oct 10 09:57:10 ktmtoshiba kernel: [  104.803004]  [<ffffffff8150bcc2>] system_call_fastpath+0x16/0x1b


Version-Release number of selected component (if applicable):
kernel 3.1.0-0.rc9.git0.1.fc17.x86_64

How reproducible:
unknown how to reproduce

Comment 1 kevin martin 2011-10-11 19:12:17 UTC

Can't reliably reproduce, but it happened again today:


Oct 11 08:51:27 ktmtoshiba kernel: [  547.135140] =======================================================
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135146] [ INFO: possible circular locking dependency detected ]
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135151] 3.1.0-0.rc9.git0.1.fc17.x86_64 #1
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135155] -------------------------------------------------------
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135159] chrome/1841 is trying to acquire lock:
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135163]  (&(&sig->cputimer.lock)->rlock){-.....}, at: [<ffffffff81047ff5>] account_group_exec_runtime+0x31/0x48
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135229] 
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135230] but task is already holding lock:
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135236]  (&rq->lock){-.-.-.}, at: [<ffffffff81056c34>] scheduler_tick+0x3e/0x242
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135253] 
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135255] which lock already depends on the new lock.
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135258] 
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135263] 
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135264] the existing dependency chain (in reverse order) is:
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135275] 
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135276] -> #2 (&rq->lock){-.-.-.}:
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135286]        [<ffffffff8108f037>] lock_acquire+0xf3/0x13e
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135296]        [<ffffffff81504555>] _raw_spin_lock+0x45/0x79
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135309]        [<ffffffff810481f7>] __task_rq_lock+0x5e/0x8b
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135318]        [<ffffffff81054046>] wake_up_new_task+0x46/0x10d
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135327]        [<ffffffff8105b8d4>] do_fork+0x22a/0x30e
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135337]        [<ffffffff81015dc4>] kernel_thread+0x75/0x77
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135348]        [<ffffffff814e00ad>] rest_init+0x31/0xde
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135358]        [<ffffffff81d53bb0>] start_kernel+0x3dd/0x3ea
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135371]        [<ffffffff81d532c4>] x86_64_start_reservations+0xaf/0xb3
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135380]        [<ffffffff81d533ca>] x86_64_start_kernel+0x102/0x111
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135389] 
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135390] -> #1 (&p->pi_lock){-.-.-.}:
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135400]        [<ffffffff8108f037>] lock_acquire+0xf3/0x13e
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135407]        [<ffffffff815046f1>] _raw_spin_lock_irqsave+0x54/0x8e
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135416]        [<ffffffff8107c24c>] thread_group_cputimer+0x32/0xbd
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135425]        [<ffffffff8107c302>] cpu_timer_sample_group+0x2b/0x75
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135433]        [<ffffffff8107d2c4>] set_process_cpu_timer+0x36/0xe0
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135441]        [<ffffffff81060d45>] set_cpu_itimer+0x122/0x194
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135452]        [<ffffffff810611bc>] do_setitimer+0x1f7/0x208
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135460]        [<ffffffff8106129b>] sys_setitimer+0x6e/0xaf
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135468]        [<ffffffff8150bcc2>] system_call_fastpath+0x16/0x1b
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135479] 
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135480] -> #0 (&(&sig->cputimer.lock)->rlock){-.....}:
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135489]        [<ffffffff8108e857>] __lock_acquire+0xa2f/0xd0c
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135497]        [<ffffffff8108f037>] lock_acquire+0xf3/0x13e
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135505]        [<ffffffff81504555>] _raw_spin_lock+0x45/0x79
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135512]        [<ffffffff81047ff5>] account_group_exec_runtime+0x31/0x48
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135522]        [<ffffffff8104cfa8>] update_curr+0x112/0x134
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135530]        [<ffffffff8104d275>] task_tick_fair+0x2f/0x120
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135538]        [<ffffffff81056cbd>] scheduler_tick+0xc7/0x242
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135546]        [<ffffffff8106af44>] update_process_times+0x65/0x75
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135557]        [<ffffffff81089945>] tick_sched_timer+0x75/0x9e
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135568]        [<ffffffff8107dcb0>] __run_hrtimer+0xed/0x1db
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135576]        [<ffffffff8107e4ea>] hrtimer_interrupt+0xe0/0x1aa
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135584]        [<ffffffff8150e94c>] smp_apic_timer_interrupt+0x77/0x8a
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135595]        [<ffffffff8150c833>] apic_timer_interrupt+0x73/0x80
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135603]        [<ffffffff811328d4>] kmem_cache_alloc+0x25/0x13a
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135613]        [<ffffffff811575f4>] alloc_inode+0x30/0x78
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135623]        [<ffffffff8115824b>] iget_locked+0x69/0x10d
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135631]        [<ffffffff811a0258>] sysfs_get_inode+0x18/0x137
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135641]        [<ffffffff811a1b14>] sysfs_lookup+0x70/0xe6
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135649]        [<ffffffff8114bce6>] d_alloc_and_lookup+0x45/0x6b
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135659]        [<ffffffff8114c983>] walk_component+0x215/0x3e8
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135667]        [<ffffffff8114d206>] link_path_walk+0x181/0x437
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135675]        [<ffffffff8114f263>] path_openat+0xb5/0x326
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135683]        [<ffffffff8114f52c>] do_filp_open+0x38/0x86
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135691]        [<ffffffff81141ace>] do_sys_open+0x6e/0x100
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135699]        [<ffffffff81141b80>] sys_open+0x20/0x22
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135707]        [<ffffffff8150bcc2>] system_call_fastpath+0x16/0x1b
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135715] 
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135717] other info that might help us debug this:
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135719] 
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135722] Chain exists of:
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135724]   &(&sig->cputimer.lock)->rlock --> &p->pi_lock --> &rq->lock
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135737] 
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135740]  Possible unsafe locking scenario:
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135742] 
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135745]        CPU0                    CPU1
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135749]        ----                    ----
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135753]   lock(&rq->lock);
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135759]                                lock(&p->pi_lock);
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135767]                                lock(&rq->lock);
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135774]   lock(&(&sig->cputimer.lock)->rlock);
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135781] 
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135782]  *** DEADLOCK ***
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135784] 
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135789] 3 locks held by chrome/1841:
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135793]  #0:  (&sb->s_type->i_mutex_key#10){+.+.+.}, at: [<ffffffff8114c95d>] walk_component+0x1ef/0x3e8
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135809]  #1:  (sysfs_mutex){+.+.+.}, at: [<ffffffff811a1ad3>] sysfs_lookup+0x2f/0xe6
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135823]  #2:  (&rq->lock){-.-.-.}, at: [<ffffffff81056c34>] scheduler_tick+0x3e/0x242
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135837] 
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135839] stack backtrace:
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135845] Pid: 1841, comm: chrome Not tainted 3.1.0-0.rc9.git0.1.fc17.x86_64 #1
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135850] Call Trace:
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135854]  <IRQ>  [<ffffffff814fa7cb>] print_circular_bug+0x1f8/0x209
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135871]  [<ffffffff8108e857>] __lock_acquire+0xa2f/0xd0c
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135881]  [<ffffffff81047ff5>] ? account_group_exec_runtime+0x31/0x48
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135889]  [<ffffffff8108f037>] lock_acquire+0xf3/0x13e
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135897]  [<ffffffff81047ff5>] ? account_group_exec_runtime+0x31/0x48
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135906]  [<ffffffff810898d0>] ? tick_nohz_handler+0xdf/0xdf
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135914]  [<ffffffff81504555>] _raw_spin_lock+0x45/0x79
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135922]  [<ffffffff81047ff5>] ? account_group_exec_runtime+0x31/0x48
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135930]  [<ffffffff810898d0>] ? tick_nohz_handler+0xdf/0xdf
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135938]  [<ffffffff81047ff5>] account_group_exec_runtime+0x31/0x48
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135946]  [<ffffffff8104cfa8>] update_curr+0x112/0x134
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135954]  [<ffffffff8104d275>] task_tick_fair+0x2f/0x120
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135962]  [<ffffffff81056cbd>] scheduler_tick+0xc7/0x242
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135970]  [<ffffffff8106af44>] update_process_times+0x65/0x75
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135979]  [<ffffffff81089945>] tick_sched_timer+0x75/0x9e
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135986]  [<ffffffff8107dcb0>] __run_hrtimer+0xed/0x1db
Oct 11 08:51:27 ktmtoshiba kernel: [  547.135995]  [<ffffffff8107e4ea>] hrtimer_interrupt+0xe0/0x1aa
Oct 11 08:51:27 ktmtoshiba kernel: [  547.136002]  [<ffffffff811575f4>] ? alloc_inode+0x30/0x78
Oct 11 08:51:27 ktmtoshiba kernel: [  547.136011]  [<ffffffff8150e94c>] smp_apic_timer_interrupt+0x77/0x8a
Oct 11 08:51:27 ktmtoshiba kernel: [  547.136019]  [<ffffffff8150c833>] apic_timer_interrupt+0x73/0x80
Oct 11 08:51:27 ktmtoshiba kernel: [  547.136023]  <EOI>  [<ffffffff8108f336>] ? mark_held_locks+0x6d/0x95
Oct 11 08:51:27 ktmtoshiba kernel: [  547.136037]  [<ffffffff8112f01e>] ? slab_pre_alloc_hook+0x40/0x54
Oct 11 08:51:27 ktmtoshiba kernel: [  547.136045]  [<ffffffff8112f019>] ? slab_pre_alloc_hook+0x3b/0x54
Oct 11 08:51:27 ktmtoshiba kernel: [  547.136053]  [<ffffffff811328d4>] kmem_cache_alloc+0x25/0x13a
Oct 11 08:51:27 ktmtoshiba kernel: [  547.136060]  [<ffffffff8108ef17>] ? lock_release+0x1b1/0x1de
Oct 11 08:51:27 ktmtoshiba kernel: [  547.136068]  [<ffffffff811575f4>] alloc_inode+0x30/0x78
Oct 11 08:51:27 ktmtoshiba kernel: [  547.136075]  [<ffffffff8115824b>] iget_locked+0x69/0x10d
Oct 11 08:51:27 ktmtoshiba kernel: [  547.136083]  [<ffffffff811a0258>] sysfs_get_inode+0x18/0x137
Oct 11 08:51:27 ktmtoshiba kernel: [  547.136090]  [<ffffffff811a1b14>] sysfs_lookup+0x70/0xe6
Oct 11 08:51:27 ktmtoshiba kernel: [  547.136098]  [<ffffffff8114bce6>] d_alloc_and_lookup+0x45/0x6b
Oct 11 08:51:27 ktmtoshiba kernel: [  547.136106]  [<ffffffff8114c983>] walk_component+0x215/0x3e8
Oct 11 08:51:27 ktmtoshiba kernel: [  547.136115]  [<ffffffff8120162d>] ? security_inode_permission+0x1e/0x20
Oct 11 08:51:27 ktmtoshiba kernel: [  547.136124]  [<ffffffff8114d206>] link_path_walk+0x181/0x437
Oct 11 08:51:27 ktmtoshiba kernel: [  547.136131]  [<ffffffff8114c1d1>] ? rcu_read_lock+0x42/0x44
Oct 11 08:51:27 ktmtoshiba kernel: [  547.136139]  [<ffffffff8114f263>] path_openat+0xb5/0x326
Oct 11 08:51:27 ktmtoshiba kernel: [  547.136147]  [<ffffffff810152b7>] ? native_sched_clock+0x34/0x36
Oct 11 08:51:27 ktmtoshiba kernel: [  547.136154]  [<ffffffff810152c2>] ? sched_clock+0x9/0xd
Oct 11 08:51:27 ktmtoshiba kernel: [  547.136162]  [<ffffffff8114f52c>] do_filp_open+0x38/0x86
Oct 11 08:51:27 ktmtoshiba kernel: [  547.136170]  [<ffffffff8108ef17>] ? lock_release+0x1b1/0x1de
Oct 11 08:51:27 ktmtoshiba kernel: [  547.136178]  [<ffffffff81504f23>] ? _raw_spin_unlock+0x28/0x3b
Oct 11 08:51:27 ktmtoshiba kernel: [  547.136187]  [<ffffffff81159c7d>] ? alloc_fd+0x176/0x188
Oct 11 08:51:27 ktmtoshiba kernel: [  547.136194]  [<ffffffff81141ace>] do_sys_open+0x6e/0x100
Oct 11 08:51:27 ktmtoshiba kernel: [  547.136202]  [<ffffffff81141b80>] sys_open+0x20/0x22
Oct 11 08:51:27 ktmtoshiba kernel: [  547.136209]  [<ffffffff8150bcc2>] system_call_fastpath+0x16/0x1b


Also, shortly thereafter I see:


Oct 11 11:34:32 ktmtoshiba kernel: [10315.539472] chrome[3487]: segfault at 7fff6ad04fd8 ip 00007f8a7fa74656 sp 00007fff6ad04fc0 error 6 in libX11.so.6.3.0[7f8a7fa3b000+138000]

Comment 2 kevin martin 2011-10-11 19:27:15 UTC

and again:


Oct 11 14:06:24 ktmtoshiba kernel: [  345.213816] =======================================================
Oct 11 14:06:24 ktmtoshiba kernel: [  345.213821] [ INFO: possible circular locking dependency detected ]
Oct 11 14:06:24 ktmtoshiba kernel: [  345.213824] 3.1.0-0.rc9.git0.1.fc17.x86_64 #1
Oct 11 14:06:24 ktmtoshiba kernel: [  345.213826] -------------------------------------------------------
Oct 11 14:06:24 ktmtoshiba kernel: [  345.213829] chrome/1821 is trying to acquire lock:
Oct 11 14:06:24 ktmtoshiba kernel: [  345.213832]  (&(&sig->cputimer.lock)->rlock){-.....}, at: [<ffffffff81047ff5>] account_group_exec_runtime+0x31/0x48
Oct 11 14:06:24 ktmtoshiba kernel: [  345.213846] 
Oct 11 14:06:24 ktmtoshiba kernel: [  345.213847] but task is already holding lock:
Oct 11 14:06:24 ktmtoshiba kernel: [  345.213849]  (&rq->lock){-.-.-.}, at: [<ffffffff81056c34>] scheduler_tick+0x3e/0x242
Oct 11 14:06:24 ktmtoshiba kernel: [  345.213859] 
Oct 11 14:06:24 ktmtoshiba kernel: [  345.213859] which lock already depends on the new lock.
Oct 11 14:06:24 ktmtoshiba kernel: [  345.213860] 
Oct 11 14:06:24 ktmtoshiba kernel: [  345.213863] 
Oct 11 14:06:24 ktmtoshiba kernel: [  345.213863] the existing dependency chain (in reverse order) is:
Oct 11 14:06:24 ktmtoshiba kernel: [  345.213866] 
Oct 11 14:06:24 ktmtoshiba kernel: [  345.213867] -> #2 (&rq->lock){-.-.-.}:
Oct 11 14:06:24 ktmtoshiba kernel: [  345.213872]        [<ffffffff8108f037>] lock_acquire+0xf3/0x13e
Oct 11 14:06:24 ktmtoshiba kernel: [  345.213879]        [<ffffffff81504555>] _raw_spin_lock+0x45/0x79
Oct 11 14:06:24 ktmtoshiba kernel: [  345.213887]        [<ffffffff810481f7>] __task_rq_lock+0x5e/0x8b
Oct 11 14:06:24 ktmtoshiba kernel: [  345.213892]        [<ffffffff81054046>] wake_up_new_task+0x46/0x10d
Oct 11 14:06:24 ktmtoshiba kernel: [  345.213897]        [<ffffffff8105b8d4>] do_fork+0x22a/0x30e
Oct 11 14:06:24 ktmtoshiba kernel: [  345.213903]        [<ffffffff81015dc4>] kernel_thread+0x75/0x77
Oct 11 14:06:24 ktmtoshiba kernel: [  345.213938]        [<ffffffff814e00ad>] rest_init+0x31/0xde
Oct 11 14:06:24 ktmtoshiba kernel: [  345.213945]        [<ffffffff81d53bb0>] start_kernel+0x3dd/0x3ea
Oct 11 14:06:24 ktmtoshiba kernel: [  345.213955]        [<ffffffff81d532c4>] x86_64_start_reservations+0xaf/0xb3
Oct 11 14:06:24 ktmtoshiba kernel: [  345.213962]        [<ffffffff81d533ca>] x86_64_start_kernel+0x102/0x111
Oct 11 14:06:24 ktmtoshiba kernel: [  345.213969] 
Oct 11 14:06:24 ktmtoshiba kernel: [  345.213970] -> #1 (&p->pi_lock){-.-.-.}:
Oct 11 14:06:24 ktmtoshiba kernel: [  345.213976]        [<ffffffff8108f037>] lock_acquire+0xf3/0x13e
Oct 11 14:06:24 ktmtoshiba kernel: [  345.213981]        [<ffffffff815046f1>] _raw_spin_lock_irqsave+0x54/0x8e
Oct 11 14:06:24 ktmtoshiba kernel: [  345.213986]        [<ffffffff8107c24c>] thread_group_cputimer+0x32/0xbd
Oct 11 14:06:24 ktmtoshiba kernel: [  345.213993]        [<ffffffff8107c302>] cpu_timer_sample_group+0x2b/0x75
Oct 11 14:06:24 ktmtoshiba kernel: [  345.213998]        [<ffffffff8107d2c4>] set_process_cpu_timer+0x36/0xe0
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214006]        [<ffffffff81060d45>] set_cpu_itimer+0x122/0x194
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214013]        [<ffffffff810611bc>] do_setitimer+0x1f7/0x208
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214018]        [<ffffffff8106129b>] sys_setitimer+0x6e/0xaf
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214025]        [<ffffffff8150bcc2>] system_call_fastpath+0x16/0x1b
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214035] 
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214035] -> #0 (&(&sig->cputimer.lock)->rlock){-.....}:
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214042]        [<ffffffff8108e857>] __lock_acquire+0xa2f/0xd0c
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214046]        [<ffffffff8108f037>] lock_acquire+0xf3/0x13e
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214051]        [<ffffffff81504555>] _raw_spin_lock+0x45/0x79
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214056]        [<ffffffff81047ff5>] account_group_exec_runtime+0x31/0x48
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214063]        [<ffffffff8104cfa8>] update_curr+0x112/0x134
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214070]        [<ffffffff8104d275>] task_tick_fair+0x2f/0x120
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214075]        [<ffffffff81056cbd>] scheduler_tick+0xc7/0x242
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214083]        [<ffffffff8106af44>] update_process_times+0x65/0x75
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214092]        [<ffffffff81089945>] tick_sched_timer+0x75/0x9e
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214102]        [<ffffffff8107dcb0>] __run_hrtimer+0xed/0x1db
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214109]        [<ffffffff8107e4ea>] hrtimer_interrupt+0xe0/0x1aa
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214116]        [<ffffffff8150e94c>] smp_apic_timer_interrupt+0x77/0x8a
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214124]        [<ffffffff8150c833>] apic_timer_interrupt+0x73/0x80
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214131]        [<ffffffff8108ef17>] lock_release+0x1b1/0x1de
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214136]        [<ffffffff81504f1b>] _raw_spin_unlock+0x20/0x3b
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214143]        [<ffffffff81154984>] dentry_kill+0xaa/0x145
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214153]        [<ffffffff81154e0c>] dput+0xf7/0x107
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214157]        [<ffffffff8114bcf9>] d_alloc_and_lookup+0x58/0x6b
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214165]        [<ffffffff8114c983>] walk_component+0x215/0x3e8
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214172]        [<ffffffff8114ed02>] do_last+0x119/0x592
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214179]        [<ffffffff8114f280>] path_openat+0xd2/0x326
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214184]        [<ffffffff8114f52c>] do_filp_open+0x38/0x86
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214189]        [<ffffffff81141ace>] do_sys_open+0x6e/0x100
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214196]        [<ffffffff81141b80>] sys_open+0x20/0x22
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214201]        [<ffffffff8150bcc2>] system_call_fastpath+0x16/0x1b
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214206] 
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214206] other info that might help us debug this:
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214208] 
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214210] Chain exists of:
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214211]   &(&sig->cputimer.lock)->rlock --> &p->pi_lock --> &rq->lock
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214218] 
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214220]  Possible unsafe locking scenario:
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214221] 
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214223]        CPU0                    CPU1
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214225]        ----                    ----
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214227]   lock(&rq->lock);
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214230]                                lock(&p->pi_lock);
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214235]                                lock(&rq->lock);
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214240]   lock(&(&sig->cputimer.lock)->rlock);
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214244] 
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214244]  *** DEADLOCK ***
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214245] 
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214249] 3 locks held by chrome/1821:
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214251]  #0:  (&sb->s_type->i_mutex_key#10){+.+.+.}, at: [<ffffffff8114c95d>] walk_component+0x1ef/0x3e8
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214264]  #1:  (&(&dentry->d_lock)->rlock){+.+...}, at: [<ffffffff81154d5b>] dput+0x46/0x107
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214272]  #2:  (&rq->lock){-.-.-.}, at: [<ffffffff81056c34>] scheduler_tick+0x3e/0x242
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214285] 
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214286] stack backtrace:
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214292] Pid: 1821, comm: chrome Not tainted 3.1.0-0.rc9.git0.1.fc17.x86_64 #1
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214297] Call Trace:
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214300]  <IRQ>  [<ffffffff814fa7cb>] print_circular_bug+0x1f8/0x209
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214314]  [<ffffffff8108e857>] __lock_acquire+0xa2f/0xd0c
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214321]  [<ffffffff81047ff5>] ? account_group_exec_runtime+0x31/0x48
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214326]  [<ffffffff8108f037>] lock_acquire+0xf3/0x13e
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214331]  [<ffffffff81047ff5>] ? account_group_exec_runtime+0x31/0x48
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214338]  [<ffffffff810898d0>] ? tick_nohz_handler+0xdf/0xdf
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214343]  [<ffffffff81504555>] _raw_spin_lock+0x45/0x79
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214348]  [<ffffffff81047ff5>] ? account_group_exec_runtime+0x31/0x48
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214353]  [<ffffffff810898d0>] ? tick_nohz_handler+0xdf/0xdf
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214357]  [<ffffffff81047ff5>] account_group_exec_runtime+0x31/0x48
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214363]  [<ffffffff8104cfa8>] update_curr+0x112/0x134
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214367]  [<ffffffff8104d275>] task_tick_fair+0x2f/0x120
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214372]  [<ffffffff81056cbd>] scheduler_tick+0xc7/0x242
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214377]  [<ffffffff8106af44>] update_process_times+0x65/0x75
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214384]  [<ffffffff81089945>] tick_sched_timer+0x75/0x9e
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214389]  [<ffffffff8107dcb0>] __run_hrtimer+0xed/0x1db
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214394]  [<ffffffff8107e4ea>] hrtimer_interrupt+0xe0/0x1aa
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214399]  [<ffffffff81154984>] ? dentry_kill+0xaa/0x145
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214406]  [<ffffffff8150e94c>] smp_apic_timer_interrupt+0x77/0x8a
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214413]  [<ffffffff8150c833>] apic_timer_interrupt+0x73/0x80
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214416]  <EOI>  [<ffffffff810152b7>] ? native_sched_clock+0x34/0x36
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214428]  [<ffffffff8108ad53>] ? arch_local_irq_restore+0x6/0xd
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214435]  [<ffffffff8108ef17>] lock_release+0x1b1/0x1de
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214440]  [<ffffffff81504f1b>] _raw_spin_unlock+0x20/0x3b
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214444]  [<ffffffff81154984>] dentry_kill+0xaa/0x145
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214449]  [<ffffffff81154e0c>] dput+0xf7/0x107
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214455]  [<ffffffff8114bcf9>] d_alloc_and_lookup+0x58/0x6b
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214461]  [<ffffffff8114c983>] walk_component+0x215/0x3e8
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214466]  [<ffffffff8114ed02>] do_last+0x119/0x592
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214471]  [<ffffffff8114f280>] path_openat+0xd2/0x326
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214476]  [<ffffffff810152b7>] ? native_sched_clock+0x34/0x36
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214481]  [<ffffffff810152c2>] ? sched_clock+0x9/0xd
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214486]  [<ffffffff8114f52c>] do_filp_open+0x38/0x86
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214491]  [<ffffffff81504f23>] ? _raw_spin_unlock+0x28/0x3b
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214498]  [<ffffffff81159c7d>] ? alloc_fd+0x176/0x188
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214503]  [<ffffffff81141ace>] do_sys_open+0x6e/0x100
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214507]  [<ffffffff81141b80>] sys_open+0x20/0x22
Oct 11 14:06:24 ktmtoshiba kernel: [  345.214513]  [<ffffffff8150bcc2>] system_call_fastpath+0x16/0x1b

Comment 3 kevin martin 2011-10-18 20:40:55 UTC

given up on chrome unstable for now as this seems to be happening more and more frequently.

Comment 4 Josh Boyer 2011-11-07 22:51:35 UTC

Do you still see this with the 3.1.0-7.fc16 kernel?  Also, was this only happening when you used chrome, or was that simply a coincidence because chrome was mostly the only thing running?

Comment 5 Josh Boyer 2011-11-07 23:18:47 UTC

Actually, cancel those questions.  This is a dupe and you probably wouldn't see anything in the final F16 kernel due to debugging stuff being disabled.

*** This bug has been marked as a duplicate of bug 744208 ***