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

Yann Hamon yann at mandragor.org
Sun Nov 29 20:39:13 GMT 2009

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

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


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

KVM VMs loses their CPU (kvm84 backport/hardy)
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