On my Trusty VM with "[x] Copy host CPU configuration" checked in virt-manager, running 'sudo modprobe -r raid6_pq && sudo modprobe raid6_pq' is enough to reproduce the kernel exception in dmesg (though I didn't see it print "Segmentation Fault", so that may be somewhat of a red herring).
I have a separate issue (which I have not filed, because I haven't triaged, and am not sure I can reproduce yet) that was blocking me from creating a Xenial guest, but I can try again shortly.
On my Trusty VM with "[x] Copy host CPU configuration" checked in virt-manager, running 'sudo modprobe -r raid6_pq && sudo modprobe raid6_pq' is enough to reproduce the kernel exception in dmesg (though I didn't see it print "Segmentation Fault", so that may be somewhat of a red herring).
Here's /proc/cpuinfo on the guest: paste.ubuntu. com/13868715/
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And here's /proc/cpuinfo on the hypervisor host: paste.ubuntu. com/13868744/
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I have a separate issue (which I have not filed, because I haven't triaged, and am not sure I can reproduce yet) that was blocking me from creating a Xenial guest, but I can try again shortly.