Ok I attempted to reproduce without success. What I tried: - Xenial on Xenial on machine/guest with avx2 - Trusty 3.13.0-{68,71} on Xenial on machine/guest with avx2
In both of these instances I modprobed raid6_pq, in the trusty instance I triggered an upgrade from 68 to 71 and neither of these caused a segfault. The following information would be useful in debugging this: 1) The differences between the guests /proc/cpuinfo with it reproducing and not-reproducing. This can verify the avx2 bit is to blame. 2) Can you simply 'sudo modprobe -r raid6_pq && sudo modprobe raid6_pq' to trigger this issue? 3) Can you test with a xenial guest and a similar configuration to see if this still triggers the issue? 4) If you have the ability testing with different versions of hypervisor (trusty vs xenial) might also be useful. Thanks, --chris j arges ** Changed in: linux (Ubuntu) Assignee: (unassigned) => Chris J Arges (arges) -- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to kvm in 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/kvm/+bug/1524069/+subscriptions -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs