** No longer affects: kvm (Ubuntu)
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https://bugs.launchpad.net/bugs/1524069
Title:
[Xenial] KVM trusty guest 3.13.0-68 raid6-pq panic in
raid6_avx21_gen_syndrome()
One could argue that libvirt should exclude x2apic from the host-model
checks, as it's emulated by qemu whether or not the host supports it.
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If you need avx2 support, --cpu Haswell-noTSX,-x2apic works on Haswell
desktop/laptop chips.
The most confusing problem is that qemu's definition of "Haswell" is
actually Haswell-E, -EP and -EX; Haswell itself lacks x2apic, which
qemu's Haswell requires. x2apic dates back to Nehalem, but qemu's
The bug persists in kernel 4.3.0-2-generic #11-Ubuntu.
@Mike - thanks for a workaround, it works, indeed :-)
--cpu=host-model-only
for virt-manager.
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To be honest, it's pretty annoying bug, as I am not able to install any
xenial VM :-(
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https://bugs.launchpad.net/bugs/1524069
Title:
[Xenial] KVM trusty guest 3.13.0-68
@Serge, A workaround for me is to use "hypervisor default" in virt-
manager. I'm not sure what the equivalent is in virt-install, but maybe
using --cpu=host-model-only would be a workaround?
>From the man page:
Expose the host CPUs configuration to the guest. This enables
the
** Summary changed:
- [trusty] 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)
+ [Xenial] KVM trusty guest 3.13.0-68 raid6-pq panic in
raid6_avx21_gen_syndrome() while
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
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
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: kvm (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1524069
It affects me, trying to bootstrap xenial vm on xenial, getting OOPS
like above.
# virt-install --name $SHORT \
--ram $MEM \
--vcpus $CPUS \
--location=http://hk.archive.ubuntu.com/ubuntu/dists/xenial/main/installer-amd64/
\
--os-type=linux --os-variant=virtio26
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