I rate this critical some people got owned by this bug.
Patches to follow.
Created attachment 91683 [details, diff]
patch against xen-sources-18.104.22.168.patch ebuild
Created attachment 91684 [details, diff]
patch taken from http://lists.xensource.com/archives/html/xen-devel/2006-07/msg00425.html
Duping against the main bug; this is fixed in 22.214.171.124 to which xen-sources should be updated instead.
*** This bug has been marked as a duplicate of 139475 ***