[Bug 490072] [NEW] KVM VMs loses their CPU (kvm84 backport/hardy)

[Yann Hamon]

Public bug reported:

Binary package hint: kvm

Using the KVM84 backport for hardy and the libvirt backport, it seems
that VMs regularly just "lose" their CPU. Can't provide much more infos
sadly, as the VM just stops writing to log files as soon as this
happens.

What I can provide though is a munin graph of when it happens:

http://waste.mandragor.org/kvmcpu/munin.html

The downtime at 2 in the morning was a reboot of the host (therefore
normal). At 6 o'clock though you can see the IRQs dropping and the CPU
just "disappearing" from the graph. The other thing I don't understand
is how munin continued working...

Rebooting the VM solves the issue.

** Affects: kvm (Ubuntu)
     Importance: Undecided
         Status: New

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KVM VMs loses their CPU (kvm84 backport/hardy)
https://bugs.launchpad.net/bugs/490072
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