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: <alpine.LNX.2.00.1509251438550.30132@pobox.suse.cz>
Date:	Fri, 25 Sep 2015 14:40:38 +0200 (CEST)
From:	Jiri Kosina <jikos@...nel.org>
To:	Sedat Dilek <sedat.dilek@...il.com>
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, 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.

-- 
Jiri Kosina
SUSE Labs

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