linux-kernel - Re: [PATCH for-3.20-fixes] workqueue: fix hang involving racing cancel[_delayed]_work_sync()'s for PREEMPT

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Message-ID: <20150302162144.GF17694@htj.duckdns.org>
Date:	Mon, 2 Mar 2015 11:21:44 -0500
From:	Tejun Heo <tj@...nel.org>
To:	Jesper Nilsson <jesper.nilsson@...s.com>
Cc:	Rabin Vincent <rabinv@...s.com>, Jesper Nilsson <jespern@...s.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH for-3.20-fixes] workqueue: fix hang involving racing
 cancel[_delayed]_work_sync()'s for PREEMPT_NONE

On Mon, Mar 02, 2015 at 01:26:15PM +0100, Jesper Nilsson wrote:
> On Mon, Feb 09, 2015 at 05:15:27PM +0100, Tejun Heo wrote:
> > Hello,
> 
> Hi!
> 
> > This patch removes the possible hang by updating __cancel_work_timer()
> > to explicitly wait for clearing of CANCELING rather than invoking
> > flush_work() after try_to_grab_pending() fails with -ENOENT.  The
> > explicit wait uses the matching bit waitqueue for the CANCELING bit.
> > 
> > Link: http://lkml.kernel.org/g/20150206171156.GA8942@axis.com
> > 
> > Signed-off-by: Tejun Heo <tj@...nel.org>
> > Reported-by: Rabin Vincent <rabin.vincent@...s.com>
> > Cc: stable@...r.kernel.org
> 
> What's the status on this patch, it's not in 4.0-rc1 at least?
> Is it queued for the 3.18 stable branch?

Sorry about the delay.  Applied to wq/for-4.0-fixes.  Will push out in
a week or so.

Thanks.

-- 
tejun
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