From mboxrd@z Thu Jan  1 00:00:00 1970
From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Subject: Re: hung task timeout when tries to shutdown guest
Date: Mon, 6 Feb 2012 13:07:33 -0500
Message-ID: <20120206180733.GA25234@phenom.dumpdata.com>
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To: Vasiliy Tolstov <v.tolstov@selfip.ru>
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On Mon, Feb 06, 2012 at 04:09:55PM +0400, Vasiliy Tolstov wrote:
> Hello. I'm try to run domU kernel from backports.debian.org under 32
> bit guest (686-pae), but after sometime i get error in dmesg:
> 
> http://cdn.selfip.ru/hang.png
> 
> in guest loaded only xen-netfront.ko module.
> 
> What does it mean?

It means it is stuck waiting for a change.
What is your Xen/dom0? IT could be that it is missing some patch?
Did you try the xen-unstable and Linux v3.2?