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Date:	Wed, 27 Apr 2011 15:05:16 -0500
From:	James Bottomley <James.Bottomley@...e.de>
To:	Chris Mason <chris.mason@...cle.com>
Cc:	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-ext4 <linux-ext4@...r.kernel.org>
Subject: Re: [BUG] fatal hang untarring 90GB file, possibly writeback
 related.

On Wed, 2011-04-27 at 12:50 -0500, James Bottomley wrote:
> To test the theory, Chris asked me to try with data=ordered.
> Unfortunately, the deadlock still shows up.  This is what I get.

As another data point: I'm trying the same kernel with CONFIG_PREEMPT
enabled.  This time the deadlock doesn't happen.  Instead, kswapd0 gets
pegged at 99% CPU for much of the untar, but it does eventually
complete.

James


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