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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Date:	Fri, 25 Sep 2015 14:47:35 +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 2:40 PM, Jiri Kosina <jikos@...nel.org> wrote:
> On Fri, 25 Sep 2015, Sedat Dilek wrote:
>
>> >> $ egrep -nr 'save|restore|acquire|release'
>> >> objdump-Dr_kernel-workqueue_o_CLANG-3-7.txt | egrep 'irq|map'
>> >> 5718:                   4601: R_X86_64_PC32     _raw_spin_unlock_irqrestore-0x4
>> >> 5766:                   4699: R_X86_64_PC32     _raw_spin_lock_irqsave-0x4
>> >> 6173:                   4bd9: R_X86_64_PC32     _raw_spin_lock_irqsave-0x4
>> >> 6265:                   4d05: R_X86_64_PC32     _raw_spin_unlock_irqrestore-0x4
>> >>
>> >> ...this is what I have.
>> >>
>> >> Does that help?
>> >
>> > It doesn't. I am asking for disassembly of del_timer_sync() (that's in
>> > kernel/time/timer.o).
>> >
>>
>> See attached file.
>
> 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?

Shall I try a different OptLevel than default -O2?

CONFIG_LOCKDEP=n ?

- Sedat -
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