http://bugzilla.kernel.org/show_bug.cgi?id=14483
--- Comment #12 from Jose Marino <bra...@hotmail.com> 2009-11-03 02:13:22 ---
I tried a bisect and this is the result:
89133f93508137231251543d1732da638e6022e1 is the first bad commit
commit 89133f93508137231251543d1732da638e6022e1
Author: Martin Schwidefsky <schwidef...@de.ibm.com>
Date: Thu Sep 24 17:29:52 2009 +0200
clocksource: Resume clocksource without taking the clocksource mutex
git commit 75c5158f70c065b9 converted the clocksource spinlock to a
mutex. This causes the following BUG:
BUG: sleeping function called from invalid context at
kernel/mutex.c:280 in_atomic(): 0, irqs_disabled(): 1, pid: 2473,
name: pm-suspend 2 locks held by pm-suspend/2473:
#0: (&buffer->mutex){......}, at: [<ffffffff8115ab13>]
sysfs_write_file+0x3c/0x137
#1: (pm_mutex){......}, at: [<ffffffff810865b5>]
enter_state+0x39/0x130 Pid: 2473, comm: pm-suspend Not tainted 2.6.31
#1 Call Trace:
[<ffffffff810792f0>] ? __debug_show_held_locks+0x22/0x24
[<ffffffff8104a2ef>] __might_sleep+0x107/0x10b
[<ffffffff8141fca9>] mutex_lock_nested+0x25/0x43
[<ffffffff81073537>] clocksource_resume+0x1c/0x60
[<ffffffff81072902>] timekeeping_resume+0x1e/0x1c8
[<ffffffff812aee62>] __sysdev_resume+0x25/0xcf
[<ffffffff812aef79>] sysdev_resume+0x6d/0xae
[<ffffffff810864f8>] suspend_devices_and_enter+0x12b/0x1af
[<ffffffff8108665b>] enter_state+0xdf/0x130
[<ffffffff81085dc3>] state_store+0xb6/0xd3
[<ffffffff81204c73>] kobj_attr_store+0x17/0x19
[<ffffffff8115abd2>] sysfs_write_file+0xfb/0x137
[<ffffffff811057d2>] vfs_write+0xae/0x10b
[<ffffffff81208392>] ? __up_read+0x1a/0x7f
[<ffffffff811058ef>] sys_write+0x4a/0x6e
[<ffffffff81011b82>] system_call_fastpath+0x16/0x1b
clocksource_resume is called early in the resume process, there is
only one cpu, no processes are running and the interrupts are
disabled. It is therefore possible to resume the clocksources
without taking the clocksource mutex.
Reported-by: Xiaotian Feng <xtf...@gmail.com>
Signed-off-by: Martin Schwidefsky <schwidef...@de.ibm.com>
Tested-by: Michal Schmidt <mschm...@redhat.com>
Cc: Xiaotian Feng <xtf...@gmail.com>
Cc: John Stultz <johns...@us.ibm.com>
LKML-Reference: <20090924172952.49697...@mschwide.boeblingen.de.ibm.com>
Signed-off-by: Ingo Molnar <mi...@elte.hu>
:040000 040000 b1a01ffad4b391de609a1a439f72c7dbfd51c8bd
3dffb0b3f8336a5ae6ed4d549fb3b47bec3f4ed6 M kernel
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