linux-kernel - Re: 3.6.0+ (GIT) -- BUG: sleeping function called from invalid context at kernel/mutex.c:269 in_atomic(): 0, irqs_disabled(): 1, pid: 3561, name: pm-suspend

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Date:	Tue, 9 Oct 2012 13:49:33 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Bryan Wu <bryan.wu@...onical.com>
Cc:	Miles Lane <miles.lane@...il.com>,
	LKML <linux-kernel@...r.kernel.org>, Pavel Machek <pavel@....cz>,
	Jamie Iles <jamie@...ieiles.com>,
	Jochen Friedrich <jochen@...am.de>
Subject: Re: 3.6.0+ (GIT) -- BUG: sleeping function called from invalid
 context at kernel/mutex.c:269 in_atomic(): 0, irqs_disabled(): 1, pid: 3561,
 name: pm-suspend

On Mon, Oct 8, 2012 at 12:07 AM, Rafael J. Wysocki <rjw@...k.pl> wrote:
> On Wednesday 03 of October 2012 21:26:17 Miles Lane wrote:
>> ACPI: Preparing to enter system sleep state S3
>> PM: Saving platform NVS memory
>> Disabling non-boot CPUs ...
>> numa_remove_cpu cpu 1 node 0: mask now 0
>> Broke affinity for irq 46
>> smpboot: CPU 1 is now offline
>> BUG: sleeping function called from invalid context at kernel/mutex.c:269
>> in_atomic(): 0, irqs_disabled(): 1, pid: 3561, name: pm-suspend
>> 4 locks held by pm-suspend/3561:
>>  #0:  (&buffer->mutex){+.+.+.}, at: [<ffffffff8113cab6>]
>> sysfs_write_file+0x37/0x121
>>  #1:  (s_active#98){.+.+.+}, at: [<ffffffff8113cb50>]
>> sysfs_write_file+0xd1/0x121
>>  #2:  (autosleep_lock){+.+.+.}, at: [<ffffffff810616c2>]
>> pm_autosleep_lock+0x12/0x14
>>  #3:  (pm_mutex){+.+.+.}, at: [<ffffffff8105c06c>] pm_suspend+0x38/0x1b8
>> irq event stamp: 103458
>> hardirqs last  enabled at (103457): [<ffffffff81460461>]
>> __mutex_unlock_slowpath+0x101/0x125
>> hardirqs last disabled at (103458): [<ffffffff8105be25>]
>> arch_suspend_disable_irqs+0xa/0xc
>> softirqs last  enabled at (103196): [<ffffffff8103445d>]
>> __do_softirq+0x12a/0x155
>> softirqs last disabled at (103171): [<ffffffff8146836c>] call_softirq+0x1c/0x30
>> Pid: 3561, comm: pm-suspend Not tainted 3.6.0+ #26
>> Call Trace:
>>  [<ffffffff8106b64e>] ? print_irqtrace_events+0x9d/0xa1
>>  [<ffffffff8104efcd>] __might_sleep+0x19f/0x1a8
>>  [<ffffffff81460345>] mutex_lock_nested+0x20/0x3b
>>  [<ffffffff81391cbb>] ledtrig_cpu+0x3b/0x7b
>>  [<ffffffff81391d29>] ledtrig_cpu_syscore_suspend+0xe/0x15
>>  [<ffffffff813329e9>] syscore_suspend+0x78/0xfd
>>  [<ffffffff8105bf42>] suspend_devices_and_enter+0x10f/0x201
>>  [<ffffffff8105c133>] pm_suspend+0xff/0x1b8
>>  [<ffffffff8105b4fa>] state_store+0x43/0x6c
>>  [<ffffffff811c5ba6>] kobj_attr_store+0xf/0x1b
>>  [<ffffffff8113cb68>] sysfs_write_file+0xe9/0x121
>>  [<ffffffff810e48a3>] vfs_write+0x9b/0xfd
>>  [<ffffffff8106bc63>] ? trace_hardirqs_on+0xd/0xf
>>  [<ffffffff810e4ac6>] sys_write+0x4d/0x7a
>>  [<ffffffff814672f4>] tracesys+0xdd/0xe2
>
> Well, this most likely has been introduced by commit:
>
> commit 8f88731d052d2b14f332249a9332690ac1b365ac
> Author: Bryan Wu <bryan.wu@...onical.com>
> Date:   Sat Jun 25 18:33:50 2011 +0800
>
>     led-triggers: create a trigger for CPU activity
>
> because ledtrig_cpu_syscore_suspend() is run in atomic context, which kind of
> doesn't play well with mutexes.
>
> Linus, Bryan, care to fix this?

I haven't worked on this patch for ages, the only reason my SoB
is in there is that I think an early patch of mine was used as starting
point...

Bryan can you look at this?

Yours,
Linus Walleij
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