linux-kernel - Re: [PATCH] workqueue: fix cwq->nr

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Message-ID: <4C752704.1030806@kernel.org>
Date:	Wed, 25 Aug 2010 16:21:56 +0200
From:	Tejun Heo <tj@...nel.org>
To:	Johannes Berg <johannes@...solutions.net>
CC:	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] workqueue: fix cwq->nr_active underflow

On 08/25/2010 04:25 PM, Johannes Berg wrote:
> On Wed, 2010-08-25 at 11:12 +0200, Tejun Heo wrote:
> 
>> Yeap, without the fix patch applied, that should confirm that we're
>> seeing the same failure, and with the patch applied, you can add a
>> printk in the else part of !delayed check in cwq_dec_nr_in_flight().
>> If the printk triggers and later rmmod dosen't trigger BUG_ON(), we
>> can be fairly sure the problem is fixed.
> 
> Unfortunately, I haven't been able to trigger either code path today.
> I'll happily believe that this was the problem though, and will just let
> you know if I run into it again, I'm keeping the debug patch for now.
> It's certainly a valid fix regardless of whether I can reproduce the
> problem or not.

Thanks.  I'll push it to Linus tomorrow.

-- 
tejun
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