Okay, I can reproduce this very easily by saturating the guest's
INCOMING network connection, with:

u...@guest$ nc -lp 1234 > /dev/null

and

u...@host$ cat /dev/urandom | nc -w 3 guest_ip 1234

In less than a second of sending, the vm crashes with:
  virtio-net truncating packet

Note that I have not reproduced the problem saturating the guest's
OUTGOING network.

I have uploaded a full-updated Ubuntu 8.04.3 (Hardy) image 
(user=ubuntu,pw=ubuntu) that I'm using to reproduce this at:
 * http://rookery.canonical.com/~kirkland/hardy.img.bz2

:-Dustin

-- 
kvm crash when using virtio for network, hardy guest
https://bugs.launchpad.net/bugs/458521
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