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

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Message-ID: <20110421173845.GE15988@htj.dyndns.org>
Date:	Thu, 21 Apr 2011 19:38:45 +0200
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()

Hello,

On Fri, Apr 15, 2011 at 10:41:40PM +0100, Sitsofe Wheeler wrote:
> I couldn't reproduce the problem with the very latest kernel but here's
> the output that appeared with an older kernel with your patch:
> 
> ------------[ cut here ]------------
> WARNING: at block/genhd.c:1561 disk_clear_events+0x164/0x170()

Hmmm... that's really weird.  It indicates that the workqueue command
sequence there doesn't guarantee scheduling and completion of the work
item, which means either there's a bug in workqueue itself or I'm
confused about what's going on.  Hopefully, the latter.
Unfortunately, even with physical setup, I'm having problem
reproducing the problem.  Which kernel version are you using exactly?
Can you please let me know the commit ID?

Thanks.

-- 
tejun
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