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Date: Mon, 14 Apr 2008 08:54:05 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: Miles Lane <miles.lane@...il.com>
Cc: LKML <linux-kernel@...r.kernel.org>,
Gautham Shenoy <ego@...ibm.com>,
"Rafael J. Wysocki" <rjw@...k.pl>, Ingo Molnar <mingo@...e.hu>
Subject: Re: 2.6.25-rc9 -- INFO: possible circular locking dependency
detected
Fun,
I will need to sort out this code before I can say anything about that,
perhaps Gautham and or Rafael have ideas before I can come up with
something.. ?
On Sun, 2008-04-13 at 23:04 -0400, Miles Lane wrote:
> [ 3217.586003] [ INFO: possible circular locking dependency detected ]
> [ 3217.586006] 2.6.25-rc9 #1
> [ 3217.586008] -------------------------------------------------------
> [ 3217.586011] pm-suspend/7421 is trying to acquire lock:
> [ 3217.586013] (&per_cpu(cpu_policy_rwsem, cpu)){----}, at:
> [<c0277fe1>] lock_policy_rwsem_write+0x33/0x5a
> [ 3217.586023]
> [ 3217.586024] but task is already holding lock:
> [ 3217.586026] (&cpu_hotplug.lock){--..}, at: [<c0142cec>]
> cpu_hotplug_begin+0x2f/0x89
> [ 3217.586033]
> [ 3217.586033] which lock already depends on the new lock.
> [ 3217.586035]
> [ 3217.586036]
> [ 3217.586037] the existing dependency chain (in reverse order) is:
> [ 3217.586039]
> [ 3217.586040] -> #3 (&cpu_hotplug.lock){--..}:
> [ 3217.586044] [<c013f39f>] __lock_acquire+0xa02/0xbaf
> [ 3217.586052] [<c013f5c2>] lock_acquire+0x76/0x9d
> [ 3217.586058] [<c0309c17>] mutex_lock_nested+0xd5/0x274
> [ 3217.586066] [<c0143038>] get_online_cpus+0x2c/0x3e
> [ 3217.586072] [<c011eb03>] sched_getaffinity+0xe/0x4d
> [ 3217.586079] [<c0159784>] __synchronize_sched+0x11/0x5f
> [ 3217.586087] [<c0137380>] synchronize_srcu+0x22/0x5b
> [ 3217.586093] [<c01376a3>] srcu_notifier_chain_unregister+0x45/0x4c
> [ 3217.586100] [<c0277204>] cpufreq_unregister_notifier+0x1f/0x2f
> [ 3217.586107] [<f8cfd68c>] cpufreq_governor_dbs+0x1e9/0x242
> [cpufreq_conservative]
> [ 3217.586117] [<c027758d>] __cpufreq_governor+0xb2/0xe9
> [ 3217.586124] [<c0277703>] __cpufreq_set_policy+0x13f/0x1c3
> [ 3217.586130] [<c0277bf3>] store_scaling_governor+0x150/0x17f
> [ 3217.586137] [<c0278708>] store+0x42/0x5b
> [ 3217.586143] [<c01b1ac9>] sysfs_write_file+0xb8/0xe3
> [ 3217.586151] [<c017dbc7>] vfs_write+0x8c/0x108
> [ 3217.586158] [<c017e122>] sys_write+0x3b/0x60
> [ 3217.586165] [<c0104470>] sysenter_past_esp+0x6d/0xc5
> [ 3217.586172] [<ffffffff>] 0xffffffff
> [ 3217.586184]
> [ 3217.586185] -> #2 (&sp->mutex){--..}:
> [ 3217.586188] [<c013f39f>] __lock_acquire+0xa02/0xbaf
> [ 3217.586195] [<c013f5c2>] lock_acquire+0x76/0x9d
> [ 3217.586201] [<c0309c17>] mutex_lock_nested+0xd5/0x274
> [ 3217.586208] [<c0137374>] synchronize_srcu+0x16/0x5b
> [ 3217.586214] [<c01376a3>] srcu_notifier_chain_unregister+0x45/0x4c
> [ 3217.586220] [<c0277204>] cpufreq_unregister_notifier+0x1f/0x2f
> [ 3217.586227] [<f8cfd68c>] cpufreq_governor_dbs+0x1e9/0x242
> [cpufreq_conservative]
> [ 3217.586235] [<c027758d>] __cpufreq_governor+0xb2/0xe9
> [ 3217.586242] [<c0277703>] __cpufreq_set_policy+0x13f/0x1c3
> [ 3217.586248] [<c0277bf3>] store_scaling_governor+0x150/0x17f
> [ 3217.586255] [<c0278708>] store+0x42/0x5b
> [ 3217.586261] [<c01b1ac9>] sysfs_write_file+0xb8/0xe3
> [ 3217.586268] [<c017dbc7>] vfs_write+0x8c/0x108
> [ 3217.586274] [<c017e122>] sys_write+0x3b/0x60
> [ 3217.586280] [<c0104470>] sysenter_past_esp+0x6d/0xc5
> [ 3217.586287] [<ffffffff>] 0xffffffff
> [ 3217.586297]
> [ 3217.586298] -> #1 (dbs_mutex#2){--..}:
> [ 3217.586302] [<c013f39f>] __lock_acquire+0xa02/0xbaf
> [ 3217.586309] [<c013f5c2>] lock_acquire+0x76/0x9d
> [ 3217.586315] [<c0309c17>] mutex_lock_nested+0xd5/0x274
> [ 3217.586322] [<f8cfd511>] cpufreq_governor_dbs+0x6e/0x242
> [cpufreq_conservative]
> [ 3217.586330] [<c027758d>] __cpufreq_governor+0xb2/0xe9
> [ 3217.586336] [<c0277719>] __cpufreq_set_policy+0x155/0x1c3
> [ 3217.586343] [<c0277bf3>] store_scaling_governor+0x150/0x17f
> [ 3217.586349] [<c0278708>] store+0x42/0x5b
> [ 3217.586355] [<c01b1ac9>] sysfs_write_file+0xb8/0xe3
> [ 3217.586362] [<c017dbc7>] vfs_write+0x8c/0x108
> [ 3217.586369] [<c017e122>] sys_write+0x3b/0x60
> [ 3217.586375] [<c0104470>] sysenter_past_esp+0x6d/0xc5
> [ 3217.586381] [<ffffffff>] 0xffffffff
> [ 3217.586451]
> [ 3217.586452] -> #0 (&per_cpu(cpu_policy_rwsem, cpu)){----}:
> [ 3217.586456] [<c013f2c6>] __lock_acquire+0x929/0xbaf
> [ 3217.586463] [<c013f5c2>] lock_acquire+0x76/0x9d
> [ 3217.586469] [<c030a219>] down_write+0x28/0x44
> [ 3217.586475] [<c0277fe1>] lock_policy_rwsem_write+0x33/0x5a
> [ 3217.586482] [<c0308abd>] cpufreq_cpu_callback+0x43/0x66
> [ 3217.586489] [<c013753e>] notifier_call_chain+0x2b/0x4a
> [ 3217.586495] [<c013757f>] __raw_notifier_call_chain+0xe/0x10
> [ 3217.586501] [<c0142dde>] _cpu_down+0x71/0x1f8
> [ 3217.586507] [<c0143094>] disable_nonboot_cpus+0x4a/0xc6
> [ 3217.586513] [<c0146ce5>] suspend_devices_and_enter+0x6c/0x101
> [ 3217.586521] [<c0146e8b>] enter_state+0xc4/0x119
> [ 3217.586527] [<c0146f76>] state_store+0x96/0xac
> [ 3217.586533] [<c01e7479>] kobj_attr_store+0x1a/0x22
> [ 3217.586541] [<c01b1ac9>] sysfs_write_file+0xb8/0xe3
> [ 3217.586547] [<c017dbc7>] vfs_write+0x8c/0x108
> [ 3217.586554] [<c017e122>] sys_write+0x3b/0x60
> [ 3217.586560] [<c0104470>] sysenter_past_esp+0x6d/0xc5
> [ 3217.586567] [<ffffffff>] 0xffffffff
> [ 3217.586578]
> [ 3217.586578] other info that might help us debug this:
> [ 3217.586580]
> [ 3217.586582] 5 locks held by pm-suspend/7421:
> [ 3217.586584] #0: (&buffer->mutex){--..}, at: [<c01b1a36>]
> sysfs_write_file+0x25/0xe3
> [ 3217.586590] #1: (pm_mutex){--..}, at: [<c0146eca>] enter_state+0x103/0x119
> [ 3217.586596] #2: (pm_sleep_rwsem){--..}, at: [<c0261789>]
> device_suspend+0x25/0x1ad
> [ 3217.586604] #3: (cpu_add_remove_lock){--..}, at: [<c0142c93>]
> cpu_maps_update_begin+0xf/0x11
> [ 3217.586610] #4: (&cpu_hotplug.lock){--..}, at: [<c0142cec>]
> cpu_hotplug_begin+0x2f/0x89
> [ 3217.586616]
> [ 3217.586617] stack backtrace:
> [ 3217.586620] Pid: 7421, comm: pm-suspend Not tainted 2.6.25-rc9 #1
> [ 3217.586627] [<c013d914>] print_circular_bug_tail+0x5b/0x66
> [ 3217.586634] [<c013d25e>] ? print_circular_bug_entry+0x39/0x43
> [ 3217.586643] [<c013f2c6>] __lock_acquire+0x929/0xbaf
> [ 3217.586656] [<c013f5c2>] lock_acquire+0x76/0x9d
> [ 3217.586661] [<c0277fe1>] ? lock_policy_rwsem_write+0x33/0x5a
> [ 3217.586668] [<c030a219>] down_write+0x28/0x44
> [ 3217.586673] [<c0277fe1>] ? lock_policy_rwsem_write+0x33/0x5a
> [ 3217.586678] [<c0277fe1>] lock_policy_rwsem_write+0x33/0x5a
> [ 3217.586684] [<c0308abd>] cpufreq_cpu_callback+0x43/0x66
> [ 3217.586689] [<c013753e>] notifier_call_chain+0x2b/0x4a
> [ 3217.586696] [<c013757f>] __raw_notifier_call_chain+0xe/0x10
> [ 3217.586701] [<c0142dde>] _cpu_down+0x71/0x1f8
> [ 3217.586710] [<c0143094>] disable_nonboot_cpus+0x4a/0xc6
> [ 3217.586716] [<c0146ce5>] suspend_devices_and_enter+0x6c/0x101
> [ 3217.586721] [<c0146e8b>] enter_state+0xc4/0x119
> [ 3217.586726] [<c0146f76>] state_store+0x96/0xac
> [ 3217.586731] [<c0146ee0>] ? state_store+0x0/0xac
> [ 3217.586736] [<c01e7479>] kobj_attr_store+0x1a/0x22
> [ 3217.586742] [<c01b1ac9>] sysfs_write_file+0xb8/0xe3
> [ 3217.586750] [<c01b1a11>] ? sysfs_write_file+0x0/0xe3
> [ 3217.586755] [<c017dbc7>] vfs_write+0x8c/0x108
> [ 3217.586762] [<c017e122>] sys_write+0x3b/0x60
> [ 3217.586769] [<c0104470>] sysenter_past_esp+0x6d/0xc5
> [ 3217.586780] =======================
> [ 3217.588064] Breaking affinity for irq 16
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