[Openstack-operators] Guest crash and KVM unhandled rdmsr

Saverio Proto zioproto at gmail.com
Fri Oct 13 09:05:19 UTC 2017

Hello Blair,

I found this link in my browser history:

Is it the same messages that you are seeing in Xenial ?


2017-10-12 23:26 GMT+02:00 Blair Bethwaite <blair.bethwaite at gmail.com>:
> 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...
> Cheers,
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