linux-kernel - Re: [Linux v4.2] workqueue: llvmlinux: acpid: BUG: sleeping function called from invalid context at kernel/workqueue.c:2680

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Message-ID: <CA+icZUVgnibkUcZH2X5t13shUiHgtQOkiT5GphhJECVvP=X=wg@mail.gmail.com>
Date:	Fri, 11 Sep 2015 18:12:20 +0200
From:	Sedat Dilek <sedat.dilek@...il.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	Lai Jiangshan <jiangshanlai@...il.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [Linux v4.2] workqueue: llvmlinux: acpid: BUG: sleeping function
 called from invalid context at kernel/workqueue.c:2680

On Thu, Sep 10, 2015 at 4:53 PM, Tejun Heo <tj@...nel.org> wrote:
> On Thu, Sep 10, 2015 at 10:52:27AM -0400, Tejun Heo wrote:
>> Hey,
>>
>> On Thu, Sep 10, 2015 at 09:04:27AM +0800, Lai Jiangshan wrote:
>> > I think we need to add might_sleep() on the top of __cancel_work_timer().
>> > The might_sleep() on the start_flush_work() doesn't cover all the
>> > paths of __cancel_work_timer().
>> > And it can help to narrow the area of this bug.
>>
>> Sure, can you submit a patch?
>
> That said, this one is likely not a bug in the kernel code but more
> likely llvm either miscompiling or deviating from gcc behavior on some
> corner cases.
>

An llvmlinux-patched Linux v4.2 kernel compiled with GCC v4.9 does not
show this BUG line.

- Sedat -

> Thanks.
>
> --
> tejun
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