From mboxrd@z Thu Jan  1 00:00:00 1970
From: Christoph Hellwig <hch@infradead.org>
Subject: Re: xfstests 073 regression
Date: Sat, 30 Jul 2011 09:44:22 -0400
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Cc: Christoph Hellwig <hch@infradead.org>,
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To: Wu Fengguang <fengguang.wu@intel.com>
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On Fri, Jul 29, 2011 at 10:21:21PM +0800, Wu Fengguang wrote:
> I cannot reproduce the bug. However looking through the code, I find
> the only possible place that may keep wb_writeback() looping with
> wb->list_lock grabbed is the below requeue_io() call.
> 
> Would you try the patch?  Note that even if it fixed the soft lockup,
> it may not be suitable as the final fix.

This patch fixes the hang for me.