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: <20150910145352.GE8114@mtj.duckdns.org>
Date:	Thu, 10 Sep 2015 10:53:52 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Lai Jiangshan <jiangshanlai@...il.com>
Cc:	sedat.dilek@...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 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.

Thanks.

-- 
tejun
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