linux-kernel - Re: WARNING: at block/genhd.c:1556 disk_clear

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Message-ID: <20110406213718.GA14139@mtj.dyndns.org>
Date:	Wed, 6 Apr 2011 14:37:18 -0700
From:	Tejun Heo <tj@...nel.org>
To:	Sitsofe Wheeler <sitsofe@...oo.com>
Cc:	Jens Axboe <axboe@...nel.dk>, linux-kernel@...r.kernel.org
Subject: Re: WARNING: at block/genhd.c:1556 disk_clear_events+0xdc/0xf0()

On Wed, Apr 06, 2011 at 10:26:11PM +0100, Sitsofe Wheeler wrote:
> On Wed, Apr 06, 2011 at 06:04:23AM -0700, Tejun Heo wrote:
> > I think disk_block_events was a bit too agressive with optimization.
> > Can you please test the following patch and see whether the problem
> > goes away?
> 
> With the 2.6.39-rc2 the warning has mysteriously disappeared all by
> itself. Could it be that other parts of the kernel were causing this to
> manifest itself?

The problem would be quite timing dependent.  It would be great if you
can prepare a setup where you can reproduce the problem on some
regular basis and make sure that the problem goes away with the patch
applied.

Thanks.

-- 
tejun
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