linux-kernel - Re: Strange block/scsi/workqueue issue

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Message-ID: <20110413051846.GD24161@mtj.dyndns.org>
Date:	Wed, 13 Apr 2011 14:18:46 +0900
From:	Tejun Heo <tj@...nel.org>
To:	James Bottomley <James.Bottomley@...senPartnership.com>
Cc:	Steven Whitehouse <swhiteho@...hat.com>,
	linux-kernel@...r.kernel.org, Jens Axboe <jaxboe@...ionio.com>
Subject: Re: Strange block/scsi/workqueue issue

Hello,

On Tue, Apr 12, 2011 at 03:43:56PM -0500, James Bottomley wrote:
> Heh, you're welcome, but this is for some value of debug.  There's still
> something strange going on on your box causing extreme delays in the way
> we do stuff.  I took advantage of the delays to explore some races in
> block and SCSI, which is what got fixed .. I've still no idea what the
> actual root cause of the delays is.

A lot of thanks for tracking down all the issues.  Something is
definitely strange with Steven's setup tho.

> Now we need to huddle and decide what we're doing in block and SCSI.  I
> think Tejun's patch with the moved signal for queue destruction patch
> would probably work as well.

Steven, can you be enticed to try the combination?  I'll prep a
combined patch and post it but please beware that I'm currently in a
rather zombish state - sleep deprived, jet lagged and malfunctioning
digestion - so the likelihood of doing something stupid is pretty
high.

Thanks.

-- 
tejun
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