Just hit this same issue with nova-compute on Xenial and creating a Xenial instance in nova. I worked around the issue with:
juju set-config nova-compute cpu-mode=host-passthrough -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1524069 Title: [Xenial] KVM trusty guest 3.13.0-68 raid6-pq panic in raid6_avx21_gen_syndrome() while probing grub devices [was: Xenial KVM: updating Trusty guest from 3.13.0-68 to 3.13.0-71 causes kernel exception] To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1524069/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
