From: David Miller <davem@davemloft.net>
Subject: Re: 2.6.25-git2: BUG: unable to handle kernel paging request at
 ffffffffffffffff
Date: Thu, 24 Apr 2008 18:35:58 -0700 (PDT)
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From: Jiri Slaby <jirislaby@gmail.com>
Date: Fri, 25 Apr 2008 00:26:18 +0200

> ff00aa00deadcc22 ff00aa00deadcc22 ff00aa00deadcc22 ff00aa00deadccf0 

0xf0...  Is this a 4-cpu machine?

I doubt it, because this is on a laptop as far as I can tell,
but I thought I'd ask. :-)

So the clue is setting some byte at ((offset % 8) == 0) into a
structure with 0xf0...