Here's an interesting addition to this problem:

In my cluster, one system is based on a core2duo CPU, while the other is
based on an i7 920 CPU. When the VM is originally started on the i7,
migration doesn't work. When it's originally started on the core2, it
does. From this, I'm guessing that the VM tries to use more CPU features
available on the newer CPU when starting, and then when it tries to
migrate to the older CPU some of those instructions fail, and that
causes the lock ups I've been seeing.

I imagine this is also why this hasn't been reported a ton, since for
people with matched systems they wouldn't see the problem.

Can anyone else still experiencing this confirm / deny mismatched CPUs?

-- 
VM is suspended after live migrate in Karmic
https://bugs.launchpad.net/bugs/448674
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