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SubjectRe: Linux 2.6.20-rc6 - supend lockdep warning
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Date
On Wed, 2007-01-24 at 18:58 -0800, Linus Torvalds wrote:
> It's been more than a week since -rc5, but I blame everybody (including
> me) being away for Linux.conf.au and then me waiting for a few days
> afterwards to let everybody sync up.

2.6.20-rc6-git (today) on a dual core laptop:

PM: Preparing system for mem sleep
Disabling non-boot CPUs ...

=======================================================
[ INFO: possible circular locking dependency detected ]
2.6.20-rc6 #3
-------------------------------------------------------
pm-suspend/3601 is trying to acquire lock:
(cpu_bitmask_lock){--..}, at: [<c032cd2b>] mutex_lock+0x1c/0x1f
but task is already holding lock:
(workqueue_mutex){--..}, at: [<c032cd2b>] mutex_lock+0x1c/0x1f
which lock already depends on the new lock.

the existing dependency chain (in reverse order) is:

-> #3 (workqueue_mutex){--..}:
[<c0140880>] __lock_acquire+0x8dd/0xa04
[<c0140c90>] lock_acquire+0x56/0x6f
[<c032cb80>] __mutex_lock_slowpath+0xe5/0x274
[<c032cd2b>] mutex_lock+0x1c/0x1f
[<c0136d14>] __create_workqueue+0x61/0x136
[<f8bfe62e>] cpufreq_governor_dbs+0xa1/0x30e [cpufreq_ondemand]
[<c02b2c3c>] __cpufreq_governor+0x9e/0xd2
[<c02b2df7>] __cpufreq_set_policy+0x187/0x209
[<c02b3056>] store_scaling_governor+0x164/0x1b1
[<c02b24f9>] store+0x37/0x48
[<c01aeb8d>] sysfs_write_file+0xb3/0xdb
[<c0175e0f>] vfs_write+0xaf/0x163
[<c017645d>] sys_write+0x3d/0x61
[<c0103f8c>] sysenter_past_esp+0x5d/0x99
[<ffffffff>] 0xffffffff
-> #2 (dbs_mutex){--..}:
[<c0140880>] __lock_acquire+0x8dd/0xa04
[<c0140c90>] lock_acquire+0x56/0x6f
[<c032cb80>] __mutex_lock_slowpath+0xe5/0x274
[<c032cd2b>] mutex_lock+0x1c/0x1f
[<f8bfe612>] cpufreq_governor_dbs+0x85/0x30e [cpufreq_ondemand]
[<c02b2c3c>] __cpufreq_governor+0x9e/0xd2
[<c02b2df7>] __cpufreq_set_policy+0x187/0x209
[<c02b3056>] store_scaling_governor+0x164/0x1b1
[<c02b24f9>] store+0x37/0x48
[<c01aeb8d>] sysfs_write_file+0xb3/0xdb
[<c0175e0f>] vfs_write+0xaf/0x163
[<c017645d>] sys_write+0x3d/0x61
[<c0103f8c>] sysenter_past_esp+0x5d/0x99
[<ffffffff>] 0xffffffff
-> #1 (&policy->lock){--..}:
[<c0140880>] __lock_acquire+0x8dd/0xa04
[<c0140c90>] lock_acquire+0x56/0x6f
[<c032cb80>] __mutex_lock_slowpath+0xe5/0x274
[<c032cd2b>] mutex_lock+0x1c/0x1f
[<c02b2ea2>] cpufreq_set_policy+0x29/0x79
[<c02b3804>] cpufreq_add_dev+0x342/0x48a
[<c025a799>] sysdev_driver_register+0x5f/0xa9
[<c02b2ad5>] cpufreq_register_driver+0xac/0x175
[<c046fd3f>] centrino_init+0x9b/0xa2
[<c01004c4>] init+0x11b/0x2c8
[<c0104c87>] kernel_thread_helper+0x7/0x10
[<ffffffff>] 0xffffffff
-> #0 (cpu_bitmask_lock){--..}:
[<c0140781>] __lock_acquire+0x7de/0xa04
[<c0140c90>] lock_acquire+0x56/0x6f
[<c032cb80>] __mutex_lock_slowpath+0xe5/0x274
[<c032cd2b>] mutex_lock+0x1c/0x1f
[<c0144840>] lock_cpu_hotplug+0x6c/0x78
[<c02b3264>] cpufreq_driver_target+0x28/0x5e
[<c02b398e>] cpufreq_cpu_callback+0x42/0x52
[<c0133cd3>] notifier_call_chain+0x20/0x31
[<c0133d00>] raw_notifier_call_chain+0x8/0xa
[<c014452e>] _cpu_down+0x47/0x1fb
[<c01448c7>] disable_nonboot_cpus+0x7b/0x100
[<c014853f>] enter_state+0x91/0x1bb
[<c01486ef>] state_store+0x86/0x9c
[<c01ae8e8>] subsys_attr_store+0x20/0x25
[<c01aeb8d>] sysfs_write_file+0xb3/0xdb
[<c0175e0f>] vfs_write+0xaf/0x163
[<c017645d>] sys_write+0x3d/0x61
[<c0103f8c>] sysenter_past_esp+0x5d/0x99
[<ffffffff>] 0xffffffff
other info that might help us debug this:

4 locks held by pm-suspend/3601:
#0: (pm_mutex){--..}, at: [<c01484ee>] enter_state+0x40/0x1bb
#1: (cpu_add_remove_lock){--..}, at: [<c032cd2b>] mutex_lock+0x1c/0x1f
#2: (cache_chain_mutex){--..}, at: [<c032cd2b>] mutex_lock+0x1c/0x1f
#3: (workqueue_mutex){--..}, at: [<c032cd2b>] mutex_lock+0x1c/0x1f
stack backtrace:
[<c0104ff6>] show_trace_log_lvl+0x1a/0x2f
[<c01056af>] show_trace+0x12/0x14
[<c0105761>] dump_stack+0x16/0x18
[<c013f101>] print_circular_bug_tail+0x5f/0x68
[<c0140781>] __lock_acquire+0x7de/0xa04
[<c0140c90>] lock_acquire+0x56/0x6f
[<c032cb80>] __mutex_lock_slowpath+0xe5/0x274
[<c032cd2b>] mutex_lock+0x1c/0x1f
[<c0144840>] lock_cpu_hotplug+0x6c/0x78
[<c02b3264>] cpufreq_driver_target+0x28/0x5e
[<c02b398e>] cpufreq_cpu_callback+0x42/0x52
[<c0133cd3>] notifier_call_chain+0x20/0x31
[<c0133d00>] raw_notifier_call_chain+0x8/0xa
[<c014452e>] _cpu_down+0x47/0x1fb
[<c01448c7>] disable_nonboot_cpus+0x7b/0x100
[<c014853f>] enter_state+0x91/0x1bb
[<c01486ef>] state_store+0x86/0x9c
[<c01ae8e8>] subsys_attr_store+0x20/0x25
[<c01aeb8d>] sysfs_write_file+0xb3/0xdb
[<c0175e0f>] vfs_write+0xaf/0x163
[<c017645d>] sys_write+0x3d/0x61
[<c0103f8c>] sysenter_past_esp+0x5d/0x99
=======================
Breaking affinity for irq 1
Breaking affinity for irq 12
Breaking affinity for irq 21
Breaking affinity for irq 22
Breaking affinity for irq 219
CPU 1 is now offline

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