From: James Bottomley <James.Bottomley@suse.de>
Subject: Re: [BUG] fatal hang untarring 90GB file, possibly writeback
 related.
Date: Thu, 28 Apr 2011 17:44:39 -0500
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Cc: Colin Ian King <colin.king@ubuntu.com>,
	Chris Mason <chris.mason@oracle.com>,
	linux-fsdevel <linux-fsdevel@vger.kernel.org>,
	linux-mm <linux-mm@kvack.org>,
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	linux-ext4 <linux-ext4@vger.kernel.org>, mgorman@novell.com
To: Jan Kara <jack@suse.cz>
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On Fri, 2011-04-29 at 00:40 +0200, Jan Kara wrote:
> James in the meantime identified that cgroups are somehow involved.
> Are you
> using systemd by any chance? Maybe cgroup IO throttling screws us?

Yes, this is a FC15 system with systemd as the default.

See related post: it looks like disabling the memory controller is what
makes this go away.

James