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Re: XFS read hangs in 3.1-rc10

To: Simon Kirby <sim@xxxxxxxxxx>
Subject: Re: XFS read hangs in 3.1-rc10
From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date: Wed, 26 Oct 2011 07:25:21 -0400
Cc: linux-kernel@xxxxxxxxxxxxxxx, xfs@xxxxxxxxxxx
In-reply-to: <20111025200748.GA25043@xxxxxxxxxx>
References: <20111020224214.GC22772@xxxxxxxxxx> <20111021132240.GA24136@xxxxxxxxxxxxx> <20111021202857.GB30100@xxxxxxxxxx> <20111024082219.GA19941@xxxxxxxxxxxxx> <20111025200748.GA25043@xxxxxxxxxx>
User-agent: Mutt/1.5.21 (2010-09-15)
On Tue, Oct 25, 2011 at 01:07:48PM -0700, Simon Kirby wrote:
> This patch seems to work, at least on an SSD box. No more hung task
> warnings, and everything appears normal.
> 
> Do we know what caused this regression and/or how to fix it without the
> big hammer, or do we need to break it down further?

I have an idea and will send you a refined patch soon.  I'm at a
conference until tomorrow, so you'll probably have to wait another day
or two for it.

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