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+icZUVQBeVM2mTgAwruPaePbHYJ6MZs12EZTap+ZUzFWjuOcw@mail.gmail.com>
Date:	Fri, 25 Sep 2015 15:18:46 +0200
From:	Sedat Dilek <sedat.dilek@...il.com>
To:	Jiri Kosina <jikos@...nel.org>
Cc:	Tejun Heo <tj@...nel.org>, LKML <linux-kernel@...r.kernel.org>,
	Darren Hart <dvhart@...ux.intel.com>,
	Lai Jiangshan <jiangshanlai@...il.com>
Subject: Re: [Linux v4.2] workqueue: llvmlinux: acpid: BUG: sleeping function
 called from invalid context at kernel/workqueue.c:2680

On Fri, Sep 25, 2015 at 3:13 PM, Jiri Kosina <jikos@...nel.org> wrote:
> On Fri, 25 Sep 2015, Sedat Dilek wrote:
>
>> > The sequence looks correct. So I don't really see what call sequence could
>> > lead to calling flush_work() from __cancel_work_timer() with IRQs
>> > disabled (which is what your stacktrace is suggesting).
>> >
>> > The fact that this doesn't happen with GCC-compiled kernels is really
>> > suspicious.
>> >
>>
>> Hm, and now?
>
> I guess one of the things to try is to generate ftrace graph trace to see
> what exact function sequence leads to this warning.
>

Can I do this via kernel-boot-parameter?
No experiences with ftrace here.

- Sedat -
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