From mboxrd@z Thu Jan  1 00:00:00 1970
From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Subject: Re: Fwd: Xen4.0/FC8/Linux-2.6.31.13 hang on boot
Date: Tue, 13 Jul 2010 16:06:36 -0400
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Oe Tue, Jul 13, 2010 at 01:22:06PM -0500, ktckd wrote:
> Thanks for the suggestion.
> 
> However I still see the hang with both 0 and 1 Polarity.
> 

OK, then the next choice is to actually debug what the faulty
instructions is.

Here are some instructions:
http://lists.xensource.com/archives/html/xen-devel/2009-01/msg00599.html

Try to get the assmebler code above and below the faulty instruction.