Re: [WARNING] kernel/workqueue.c:2041 process_one_work (when cpu goes offline)

From	Tejun Heo <tj@kernel.org>
Newsgroups	linux.kernel
Subject	Re: [WARNING] kernel/workqueue.c:2041 process_one_work (when cpu goes offline)
Date	2017-04-18 10:20 +0200
Message-ID	<txwwG-3Q5-3@gated-at.bofh.it> (permalink)
References	<tsYDf-6EZ-9@gated-at.bofh.it> <tuRxE-7Yc-19@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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Hello,

On Tue, Apr 11, 2017 at 09:08:37AM +0900, Tejun Heo wrote:
> On Wed, Apr 05, 2017 at 03:16:28PM -0400, Steven Rostedt wrote:
> > My tests have started to recently trigger this warning quite often,
> > which causes my tests to fail. The test that triggers this is running
> > the mmiotracer which forces all but one CPU offline.

So, the rescuer handling seems fine and nothing really changed from
workqueue side.  Any chance cpuset is involved?  If so, there was a
recent race condition fix 77f88796cee8 ("cgroup, kthread: close race
window where new kthreads can be migrated to non-root cgroups").  If
that's not it, it'd be great if you can explain the test case so that
I can repro the problem.

Thanks.

-- 
tejun

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Re: [WARNING] kernel/workqueue.c:2041 process_one_work (when cpu  goes offline) Tejun Heo <tj@kernel.org> - 2017-04-11 02:10 +0200
  Re: [WARNING] kernel/workqueue.c:2041 process_one_work (when cpu  goes offline) Tejun Heo <tj@kernel.org> - 2017-04-18 10:20 +0200

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