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Date: Fri, 7 Oct 2011 12:27:38 -0400
From: Miles Lane <miles.lane@...il.com>
To: LKML <linux-kernel@...r.kernel.org>,
Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...hat.com>
Subject: 3.1.0-rc9-00020-g3ee72ca (Linus git tree) -- INFO: possible circular
locking dependency detected
I hope I have CCed the right maintainers.
[ 73.223063] [ INFO: possible circular locking dependency detected ]
[ 73.223065] 3.1.0-rc9-00020-g3ee72ca #3
[ 73.223066] -------------------------------------------------------
[ 73.223068] chrome/2324 is trying to acquire lock:
[ 73.223069] (&(&sig->cputimer.lock)->rlock){......}, at:
[<ffffffff81027953>] account_group_exec_runtime+0x2d/0x45
[ 73.223077]
[ 73.223078] but task is already holding lock:
[ 73.223079] (&rq->lock){-.-.-.}, at: [<ffffffff813aada9>]
__schedule+0xd2/0x636
[ 73.223085]
[ 73.223085] which lock already depends on the new lock.
[ 73.223086]
[ 73.223087]
[ 73.223088] the existing dependency chain (in reverse order) is:
[ 73.223089]
[ 73.223090] -> #2 (&rq->lock){-.-.-.}:
[ 73.223093] [<ffffffff81062007>] lock_acquire+0x8a/0xa2
[ 73.223097] [<ffffffff813acb99>] _raw_spin_lock+0x36/0x45
[ 73.223100] [<ffffffff81027b5b>] __task_rq_lock+0x59/0x85
[ 73.223103] [<ffffffff81032a34>] wake_up_new_task+0x3f/0x92
[ 73.223106] [<ffffffff8103682e>] do_fork+0x198/0x236
[ 73.223109] [<ffffffff81008549>] kernel_thread+0x6b/0x6d
[ 73.223113] [<ffffffff8139205d>] rest_init+0x21/0xd2
[ 73.223117] [<ffffffff81671b1e>] start_kernel+0x394/0x39f
[ 73.223121] [<ffffffff8167129f>] x86_64_start_reservations+0xaf/0xb3
[ 73.223123] [<ffffffff81671393>] x86_64_start_kernel+0xf0/0xf7
[ 73.223126]
[ 73.223126] -> #1 (&p->pi_lock){-.-.-.}:
[ 73.223129] [<ffffffff81062007>] lock_acquire+0x8a/0xa2
[ 73.223132] [<ffffffff813acc92>] _raw_spin_lock_irqsave+0x44/0x57
[ 73.223135] [<ffffffff81050c79>] thread_group_cputimer+0x2d/0xb8
[ 73.223138] [<ffffffff81050d2a>] cpu_timer_sample_group+0x26/0x70
[ 73.223141] [<ffffffff81051c81>] set_process_cpu_timer+0x31/0xdb
[ 73.223143] [<ffffffff8103b201>] set_cpu_itimer+0x121/0x179
[ 73.223147] [<ffffffff8103b64f>] do_setitimer+0x1e4/0x1f5
[ 73.223149] [<ffffffff8103b724>] sys_setitimer+0x69/0xa9
[ 73.223152] [<ffffffff813b1d3b>] system_call_fastpath+0x16/0x1b
[ 73.223155]
[ 73.223155] -> #0 (&(&sig->cputimer.lock)->rlock){......}:
[ 73.223158] [<ffffffff810618f7>] __lock_acquire+0xa73/0xd67
[ 73.223160] [<ffffffff81062007>] lock_acquire+0x8a/0xa2
[ 73.223163] [<ffffffff813acb99>] _raw_spin_lock+0x36/0x45
[ 73.223165] [<ffffffff81027953>] account_group_exec_runtime+0x2d/0x45
[ 73.223168] [<ffffffff810279e7>] update_curr+0x7c/0x85
[ 73.223171] [<ffffffff8102aa11>] dequeue_task_fair+0x30/0x10b
[ 73.223173] [<ffffffff81029685>] dequeue_task+0x75/0x7c
[ 73.223176] [<ffffffff810296b2>] deactivate_task+0x26/0x2f
[ 73.223178] [<ffffffff813aae09>] __schedule+0x132/0x636
[ 73.223180] [<ffffffff813ab45e>] schedule+0x55/0x57
[ 73.223183] [<ffffffff813ab4be>] io_schedule+0x5e/0x79
[ 73.223186] [<ffffffff8109912f>] sleep_on_page_killable+0x9/0x36
[ 73.223190] [<ffffffff813ab945>] __wait_on_bit+0x43/0x76
[ 73.223192] [<ffffffff8109aef6>] wait_on_page_bit_killable+0x6f/0x71
[ 73.223196] [<ffffffff8109af3c>] __lock_page_or_retry+0x44/0x8d
[ 73.223198] [<ffffffff8109b154>] filemap_fault+0x1cf/0x35b
[ 73.223201] [<ffffffff810ae9f1>] __do_fault+0x98/0x333
[ 73.223205] [<ffffffff810b0a97>] handle_pte_fault+0x20f/0x5a0
[ 73.223208] [<ffffffff810b10d8>] handle_mm_fault+0x155/0x168
[ 73.223211] [<ffffffff813afedd>] do_page_fault+0x30a/0x351
[ 73.223213] [<ffffffff813ad97f>] page_fault+0x1f/0x30
[ 73.223216] [<ffffffff811aae8d>] strncpy_from_user+0x33/0x35
[ 73.223220] [<ffffffff810d941c>] getname_flags+0x16b/0x1db
[ 73.223223] [<ffffffff810d9497>] getname+0xb/0xd
[ 73.223226] [<ffffffff810cf4cf>] do_sys_open+0x31/0xfb
[ 73.223229] [<ffffffff810cf5b4>] sys_open+0x1b/0x1d
[ 73.223232] [<ffffffff813b1d3b>] system_call_fastpath+0x16/0x1b
[ 73.223234]
[ 73.223235] other info that might help us debug this:
[ 73.223235]
[ 73.223237] Chain exists of:
[ 73.223237] &(&sig->cputimer.lock)->rlock --> &p->pi_lock --> &rq->lock
[ 73.223241]
[ 73.223242] Possible unsafe locking scenario:
[ 73.223243]
[ 73.223244] CPU0 CPU1
[ 73.223245] ---- ----
[ 73.223246] lock(&rq->lock);
[ 73.223248] lock(&p->pi_lock);
[ 73.223250] lock(&rq->lock);
[ 73.223253] lock(&(&sig->cputimer.lock)->rlock);
[ 73.223255]
[ 73.223255] *** DEADLOCK ***
[ 73.223255]
[ 73.223257] 1 lock held by chrome/2324:
[ 73.223258] #0: (&rq->lock){-.-.-.}, at: [<ffffffff813aada9>]
__schedule+0xd2/0x636
[ 73.223263]
[ 73.223263] stack backtrace:
[ 73.223265] Pid: 2324, comm: chrome Not tainted 3.1.0-rc9-00020-g3ee72ca #3
[ 73.223267] Call Trace:
[ 73.223271] [<ffffffff813a4884>] print_circular_bug+0x1f8/0x209
[ 73.223274] [<ffffffff810618f7>] __lock_acquire+0xa73/0xd67
[ 73.223277] [<ffffffff81062007>] lock_acquire+0x8a/0xa2
[ 73.223279] [<ffffffff81027953>] ? account_group_exec_runtime+0x2d/0x45
[ 73.223282] [<ffffffff813acb99>] _raw_spin_lock+0x36/0x45
[ 73.223285] [<ffffffff81027953>] ? account_group_exec_runtime+0x2d/0x45
[ 73.223287] [<ffffffff81027953>] account_group_exec_runtime+0x2d/0x45
[ 73.223290] [<ffffffff810279e7>] update_curr+0x7c/0x85
[ 73.223292] [<ffffffff8102aa11>] dequeue_task_fair+0x30/0x10b
[ 73.223295] [<ffffffff81099126>] ? sleep_on_page+0xd/0xd
[ 73.223297] [<ffffffff81029685>] dequeue_task+0x75/0x7c
[ 73.223299] [<ffffffff810296b2>] deactivate_task+0x26/0x2f
[ 73.223302] [<ffffffff813aae09>] __schedule+0x132/0x636
[ 73.223304] [<ffffffff8105736c>] ? ktime_get_ts+0x80/0x89
[ 73.223307] [<ffffffff81099126>] ? sleep_on_page+0xd/0xd
[ 73.223309] [<ffffffff813ab45e>] schedule+0x55/0x57
[ 73.223312] [<ffffffff813ab4be>] io_schedule+0x5e/0x79
[ 73.223314] [<ffffffff8109912f>] sleep_on_page_killable+0x9/0x36
[ 73.223317] [<ffffffff813ab945>] __wait_on_bit+0x43/0x76
[ 73.223320] [<ffffffff8109aef6>] wait_on_page_bit_killable+0x6f/0x71
[ 73.223323] [<ffffffff8104f6f4>] ? autoremove_wake_function+0x38/0x38
[ 73.223326] [<ffffffff8109af3c>] __lock_page_or_retry+0x44/0x8d
[ 73.223328] [<ffffffff8109b154>] filemap_fault+0x1cf/0x35b
[ 73.223331] [<ffffffff810ae9f1>] __do_fault+0x98/0x333
[ 73.223334] [<ffffffff810af353>] ? __pte_alloc+0x3e/0xf8
[ 73.223337] [<ffffffff810b0a97>] handle_pte_fault+0x20f/0x5a0
[ 73.223339] [<ffffffff813ad13c>] ? _raw_spin_unlock+0x43/0x51
[ 73.223342] [<ffffffff810b10d8>] handle_mm_fault+0x155/0x168
[ 73.223345] [<ffffffff813afedd>] do_page_fault+0x30a/0x351
[ 73.223347] [<ffffffff81061bdc>] ? __lock_acquire+0xd58/0xd67
[ 73.223350] [<ffffffff810d92dd>] ? getname_flags+0x2c/0x1db
[ 73.223352] [<ffffffff8105e77c>] ? trace_hardirqs_off_caller+0xa3/0x10b
[ 73.223355] [<ffffffff811aab1d>] ? trace_hardirqs_off_thunk+0x3a/0x3c
[ 73.223358] [<ffffffff813ad97f>] page_fault+0x1f/0x30
[ 73.223361] [<ffffffff811aae47>] ? __strncpy_from_user+0x30/0x43
[ 73.223363] [<ffffffff811aae30>] ? __strncpy_from_user+0x19/0x43
[ 73.223366] [<ffffffff811aae8d>] strncpy_from_user+0x33/0x35
[ 73.223369] [<ffffffff810d941c>] getname_flags+0x16b/0x1db
[ 73.223373] [<ffffffff810d9497>] getname+0xb/0xd
[ 73.223375] [<ffffffff810cf4cf>] do_sys_open+0x31/0xfb
[ 73.223378] [<ffffffff810cf5b4>] sys_open+0x1b/0x1d
[ 73.223380] [<ffffffff813b1d3b>] system_call_fastpath+0x16/0x1b
--
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