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SubjectRe: APM lockups since 2.6.25
> So it didn't help, I just got this (2.6.25-rc8):
>
> (I have turned lockdep on few days ago, and it seems to try to release a
> lock that's not held ... and then reacquire that lock again and deadlock)

BTW. the first one message happened immediatelly after APM resume, the
second message 2 minutes later.

APMD didn't set time after resume, it's completely locked up.

Mikulas

> =====================================
> [ BUG: bad unlock balance detected! ]
> -------------------------------------
> kapmd/1643 is trying to release lock (pm_sleep_rwsem) at:
> [<c01e3a75>] device_resume+0x129/0x12e
> but there are no more locks to release!
>
> other info that might help us debug this:
> no locks held by kapmd/1643.
>
> stack backtrace:
> Pid: 1643, comm: kapmd Not tainted 2.6.25-rc8 #5
> [<c012f877>] print_unlock_inbalance_bug+0xd7/0xe1
> [<c0241465>] ? _spin_unlock_irqrestore+0x36/0x58
> [<c012e6d5>] ? trace_hardirqs_on+0xdf/0x100
> [<c012e560>] ? mark_held_locks+0x4e/0x66
> [<c024002c>] ? mutex_lock_nested+0x1f3/0x217
> [<c012e6d5>] ? trace_hardirqs_on+0xdf/0x100
> [<c01e3a75>] ? device_resume+0x129/0x12e
> [<c012fa36>] lock_release+0x90/0x132
> [<c0127f6c>] up_write+0x16/0x2a
> [<c01e3a75>] device_resume+0x129/0x12e
> [<c884e251>] apm+0x457/0x523 [apm]
> [<c01110a1>] ? default_wake_function+0x0/0xd
> [<c884ddfa>] ? apm+0x0/0x523 [apm]
> [<c0124cd5>] kthread+0x39/0x5e
> [<c0124c9c>] ? kthread+0x0/0x5e
> [<c0102fdf>] kernel_thread_helper+0x7/0x10
> =======================
> INFO: task apmd:1813 blocked for more than 120 seconds.
> "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
> apmd D c6cb0260 2320 1813 1
> c7b06ea8 00000046 c6cb0000 c6cb0260 c003f081 0000a086 c6d13980
> c6cb0260
> c02e724c c02e724c ffffffff c79f1b60 c02e7248 c7b06ed0 c0240e71
> c7b06ed8
> c02e724c c02e7268 c6cb0000 c7b06eec c02e7248 c79f1b60 00000000
> c7b06eec
> Call Trace:
> [<c0240e71>] rwsem_down_failed_common+0x122/0x140
> [<c0240eaa>] rwsem_down_write_failed+0x1b/0x23
> [<c0240f2a>] call_rwsem_down_write_failed+0x6/0x8
> [<c0240502>] ? down_write+0x3b/0x43
> [<c01e3a9f>] ? device_suspend+0x25/0x1ac
> [<c01e3a9f>] device_suspend+0x25/0x1ac
> [<c884d624>] suspend+0x66/0x12e [apm]
> [<c884d95a>] do_ioctl+0xd3/0x14b [apm]
> [<c0161588>] vfs_ioctl+0x50/0x69
> [<c01617e6>] do_vfs_ioctl+0x245/0x258
> [<c0161825>] sys_ioctl+0x2c/0x47
> [<c0102cd2>] syscall_call+0x7/0xb
> =======================
> INFO: lockdep is turned off.
>
> Mikulas
>


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