An f9 vm just died on me, I am attaching the stack trace from the console. This is f9 x86_64 pv under a f8 x86_64. Let me know if you need any more info.
Created attachment 305417 [details] console log
Thanks for the report kernel-xen-2.6-2.6.25.3-1.fc9 which has just been pushed to updates should fix this https://admin.fedoraproject.org/updates/F9/FEDORA-2008-3980