[Openstack-operators] Guest crash and KVM unhandled rdmsr

Blair Bethwaite blair.bethwaite at gmail.com
Thu Oct 12 21:26:44 UTC 2017

Hi all,

Has anyone seen guest crashes/freezes associated with KVM unhandled rdmsr
messages in dmesg on the hypervisor?

We have seen these messages before but never with a strong correlation to
guest problems. However over the past couple of weeks this is happening
almost daily with consistent correlation for a set of hosts dedicated to a
particular HPC workload. So far as I know the workload has not changed, but
we have just recently moved the hypervisors to Ubuntu Xenial (though they
were already on the Xenial kernel previously) and done minor guest
(CentOS7) updates. CPU mode is host-passthrough. Currently trying to figure
out if the CPU flags in the guest have changed since the host upgrade...

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