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SubjectINFO: possible circular locking dependency at cleanup_workqueue_thread
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Hi

With this kernel a4d7749be5de4a7261bcbe3c7d96c748792ec455

I've got this INFO trace during suspend:


CPU 1 is now offline
lockdep: fixing up alternatives.
SMP alternatives: switching to UP code
CPU0 attaching NULL sched-domain.
CPU1 attaching NULL sched-domain.
CPU0 attaching NULL sched-domain.

=======================================================
[ INFO: possible circular locking dependency detected ]
2.6.30-rc5-00097-gd665355 #59
-------------------------------------------------------
pm-suspend/12129 is trying to acquire lock:
(events){+.+.+.}, at: [<ffffffff80259496>] cleanup_workqueue_thread+0x26/0xd0
but task is already holding lock:
(cpu_add_remove_lock){+.+.+.}, at: [<ffffffff80246e57>]
cpu_maps_update_begin+0x17/0x20
which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #5 (cpu_add_remove_lock){+.+.+.}:
[<ffffffff80271a64>] __lock_acquire+0xc64/0x10a0
[<ffffffff80271f38>] lock_acquire+0x98/0x140
[<ffffffff8054e78c>] __mutex_lock_common+0x4c/0x3b0
[<ffffffff8054ebf6>] mutex_lock_nested+0x46/0x60
[<ffffffff80246e57>] cpu_maps_update_begin+0x17/0x20
[<ffffffff80259c33>] __create_workqueue_key+0xc3/0x250
[<ffffffff80287b20>] stop_machine_create+0x40/0xb0
[<ffffffff8027a784>] sys_delete_module+0x84/0x270
[<ffffffff8020c15b>] system_call_fastpath+0x16/0x1b
[<ffffffffffffffff>] 0xffffffffffffffff
-> #4 (setup_lock){+.+.+.}:
[<ffffffff80271a64>] __lock_acquire+0xc64/0x10a0
[<ffffffff80271f38>] lock_acquire+0x98/0x140
[<ffffffff8054e78c>] __mutex_lock_common+0x4c/0x3b0
[<ffffffff8054ebf6>] mutex_lock_nested+0x46/0x60
[<ffffffff80287af7>] stop_machine_create+0x17/0xb0
[<ffffffff80246f06>] disable_nonboot_cpus+0x26/0x130
[<ffffffff8027dd8d>] suspend_devices_and_enter+0xbd/0x1b0
[<ffffffff8027dff7>] enter_state+0x107/0x170
[<ffffffff8027e0f9>] state_store+0x99/0x100
[<ffffffff803abe17>] kobj_attr_store+0x17/0x20
[<ffffffff8033f1e9>] sysfs_write_file+0xd9/0x160
[<ffffffff802e1c88>] vfs_write+0xb8/0x180
[<ffffffff802e2771>] sys_write+0x51/0x90
[<ffffffff8020c15b>] system_call_fastpath+0x16/0x1b
[<ffffffffffffffff>] 0xffffffffffffffff
-> #3 (dpm_list_mtx){+.+.+.}:
[<ffffffff80271a64>] __lock_acquire+0xc64/0x10a0
[<ffffffff80271f38>] lock_acquire+0x98/0x140
[<ffffffff8054e78c>] __mutex_lock_common+0x4c/0x3b0
[<ffffffff8054ebf6>] mutex_lock_nested+0x46/0x60
[<ffffffff804532ff>] device_pm_add+0x1f/0xe0
[<ffffffff8044b9bf>] device_add+0x45f/0x570
[<ffffffffa007c578>] wiphy_register+0x158/0x280 [cfg80211]
[<ffffffffa017567c>] ieee80211_register_hw+0xbc/0x410 [mac80211]
[<ffffffffa01f7c5c>] iwl3945_pci_probe+0xa1c/0x1080 [iwl3945]
[<ffffffff803c4307>] local_pci_probe+0x17/0x20
[<ffffffff803c5458>] pci_device_probe+0x88/0xb0
[<ffffffff8044e1e9>] driver_probe_device+0x89/0x180
[<ffffffff8044e37b>] __driver_attach+0x9b/0xa0
[<ffffffff8044d67c>] bus_for_each_dev+0x6c/0xa0
[<ffffffff8044e03e>] driver_attach+0x1e/0x20
[<ffffffff8044d955>] bus_add_driver+0xd5/0x290
[<ffffffff8044e668>] driver_register+0x78/0x140
[<ffffffff803c56f6>] __pci_register_driver+0x66/0xe0
[<ffffffffa00bd05c>] 0xffffffffa00bd05c
[<ffffffff8020904f>] do_one_initcall+0x3f/0x1c0
[<ffffffff8027d071>] sys_init_module+0xb1/0x200
[<ffffffff8020c15b>] system_call_fastpath+0x16/0x1b
[<ffffffffffffffff>] 0xffffffffffffffff
-> #2 (cfg80211_mutex){+.+.+.}:
[<ffffffff80271a64>] __lock_acquire+0xc64/0x10a0
[<ffffffff80271f38>] lock_acquire+0x98/0x140
[<ffffffff8054e78c>] __mutex_lock_common+0x4c/0x3b0
[<ffffffff8054ebf6>] mutex_lock_nested+0x46/0x60
[<ffffffffa007e66a>] reg_todo+0x19a/0x590 [cfg80211]
[<ffffffff80258f18>] worker_thread+0x1e8/0x3a0
[<ffffffff8025dc3a>] kthread+0x5a/0xa0
[<ffffffff8020d23a>] child_rip+0xa/0x20
[<ffffffffffffffff>] 0xffffffffffffffff
-> #1 (reg_work){+.+.+.}:
[<ffffffff80271a64>] __lock_acquire+0xc64/0x10a0
[<ffffffff80271f38>] lock_acquire+0x98/0x140
[<ffffffff80258f12>] worker_thread+0x1e2/0x3a0
[<ffffffff8025dc3a>] kthread+0x5a/0xa0
[<ffffffff8020d23a>] child_rip+0xa/0x20
[<ffffffffffffffff>] 0xffffffffffffffff
-> #0 (events){+.+.+.}:
[<ffffffff80271b36>] __lock_acquire+0xd36/0x10a0
[<ffffffff80271f38>] lock_acquire+0x98/0x140
[<ffffffff802594bd>] cleanup_workqueue_thread+0x4d/0xd0
[<ffffffff8053fe79>] workqueue_cpu_callback+0xc9/0x10f
[<ffffffff805539a8>] notifier_call_chain+0x68/0xa0
[<ffffffff802630d6>] raw_notifier_call_chain+0x16/0x20
[<ffffffff8053d9ec>] _cpu_down+0x1cc/0x2d0
[<ffffffff80246f90>] disable_nonboot_cpus+0xb0/0x130
[<ffffffff8027dd8d>] suspend_devices_and_enter+0xbd/0x1b0
[<ffffffff8027dff7>] enter_state+0x107/0x170
[<ffffffff8027e0f9>] state_store+0x99/0x100
[<ffffffff803abe17>] kobj_attr_store+0x17/0x20
[<ffffffff8033f1e9>] sysfs_write_file+0xd9/0x160
[<ffffffff802e1c88>] vfs_write+0xb8/0x180
[<ffffffff802e2771>] sys_write+0x51/0x90
[<ffffffff8020c15b>] system_call_fastpath+0x16/0x1b
[<ffffffffffffffff>] 0xffffffffffffffff
other info that might help us debug this:

4 locks held by pm-suspend/12129:
#0: (&buffer->mutex){+.+.+.}, at: [<ffffffff8033f154>]
sysfs_write_file+0x44/0x160
#1: (pm_mutex){+.+.+.}, at: [<ffffffff8027df44>] enter_state+0x54/0x170
#2: (dpm_list_mtx){+.+.+.}, at: [<ffffffff80452747>] device_pm_lock+0x17/0x20
#3: (cpu_add_remove_lock){+.+.+.}, at: [<ffffffff80246e57>]
cpu_maps_update_begin+0x17/0x20
stack backtrace:
Pid: 12129, comm: pm-suspend Not tainted 2.6.30-rc5-00097-gd665355 #59
Call Trace:
[<ffffffff8026fa3d>] print_circular_bug_tail+0x9d/0xe0
[<ffffffff80271b36>] __lock_acquire+0xd36/0x10a0
[<ffffffff80270000>] ? mark_lock+0x3e0/0x400
[<ffffffff80271f38>] lock_acquire+0x98/0x140
[<ffffffff80259496>] ? cleanup_workqueue_thread+0x26/0xd0
[<ffffffff802594bd>] cleanup_workqueue_thread+0x4d/0xd0
[<ffffffff80259496>] ? cleanup_workqueue_thread+0x26/0xd0
[<ffffffff802703ed>] ? trace_hardirqs_on+0xd/0x10
[<ffffffff8053fe79>] workqueue_cpu_callback+0xc9/0x10f
[<ffffffff8054acf1>] ? cpu_callback+0x12/0x280
[<ffffffff805539a8>] notifier_call_chain+0x68/0xa0
[<ffffffff802630d6>] raw_notifier_call_chain+0x16/0x20
[<ffffffff8053d9ec>] _cpu_down+0x1cc/0x2d0
[<ffffffff80246f90>] disable_nonboot_cpus+0xb0/0x130
[<ffffffff8027dd8d>] suspend_devices_and_enter+0xbd/0x1b0
[<ffffffff8027dff7>] enter_state+0x107/0x170
[<ffffffff8027e0f9>] state_store+0x99/0x100
[<ffffffff803abe17>] kobj_attr_store+0x17/0x20
[<ffffffff8033f1e9>] sysfs_write_file+0xd9/0x160
[<ffffffff802e1c88>] vfs_write+0xb8/0x180
[<ffffffff8029088c>] ? audit_syscall_entry+0x21c/0x240
[<ffffffff802e2771>] sys_write+0x51/0x90
[<ffffffff8020c15b>] system_call_fastpath+0x16/0x1b
CPU1 is down
Extended CMOS year: 2000
x86 PAT enabled: cpu 0, old 0x7040600070406, new 0x7010600070106
Back to C!

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