[nova][qa][infra] Adding no_timer_check to the kernel command line of our CI images

Arkady Kanevsky akanevsk at redhat.com
Wed Aug 18 21:12:47 UTC 2021

Thanks Lee.
it was causing problems for a long time.

On Wed, Aug 18, 2021 at 5:09 PM Lee Yarwood <lyarwood at redhat.com> wrote:

> Hello all,
> For a while now we've been attempting to track down some infrequent but
> annoying Tempest test cleanup failures in CI when detaching volumes from
> an instance. Finally after rewriting part of the Tempest logic
> controlling the cleanup we've been able to confirm that this is being
> caused by a kernel panic within the instance at boot time as documented
> in the following bug:
> Failure to detach volume during Tempest test cleanup due to APIC related
> kernel panic within the guest OS
> https://bugs.launchpad.net/nova/+bug/1939108
> This had been previously found in 2014 but at the time a fix was only
> proposed to Nova that would solve this when using a supplied kernel
> image:
> cirros 0.3.1 fails to boot
> https://bugs.launchpad.net/cirros/+bug/1312199
> Use no_timer_check with soft-qemu
> https://review.opendev.org/c/openstack/nova/+/96090
> Most (all?) of our CI currently running with [libvirt]virt_type=qemu
> uses the full Cirros 0.5.2 image. Does anyone have any suggestions on
> the best way of modifying the image(s) we use in CI to use the
> no_timer_check kernel command line arg?
> Thanks in advance,
> --
> Lee Yarwood                 A5D1 9385 88CB 7E5F BE64  6618 BCA6 6E33 F672
> 2D76

Arkady Kanevsky, Ph.D.
Phone: 972 707-6456
Corporate Phone: 919 729-5744 ext. 8176456
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