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Date:	Mon, 12 Nov 2007 14:32:03 +0100
From:	Miklos Szeredi <miklos@...redi.hu>
To:	mikulas@...ax.karlin.mff.cuni.cz
CC:	a.p.zijlstra@...llo.nl, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, wfg@...l.ustc.edu.cn
Subject: Re: Temporary lockup on loopback block device

> On 2.6.23 it could happen even without loopback

Let's focus on this point, because we already know how the lockup
happens _with_ loopback and any other kind of bdi stacking.

Can you describe the setup?  Or better still, can you reproduce it and
post the sysrq-t output?

Thanks,
Miklos
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