yahoo-eng-team team mailing list archive

[Stephen Finucane <1906266@xxxxxxxxxxxxxxxxxx>]

Given the above, the solution here seems to be to update your version of
libvirt to >= 6.1.0. I'm going to mark this as WONTFIX. If this does not
resolve the issue, please reset to new and provide information on the
version of libvirt you've tested with and detailed logs from nova-
compute showing the error.

** Changed in: nova
       Status: New => Won't Fix

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https://bugs.launchpad.net/bugs/1906266

Title:
  After upgrade: "libvirt.libvirtError: Requested operation is not
  valid: format of backing image %s of image %s was not specified"

Status in OpenStack Compute (nova):
  Won't Fix

Bug description:
  In a site upgraded to Ussuri we are getting faults starting instances

  2020-11-30 13:41:40.586 232871 ERROR oslo_messaging.rpc.server
  libvirt.libvirtError: Requested operation is not valid: format of
  backing image '/var/lib/nova/instances/_base/xxx' of image
  '/var/lib/nova/instances/xxx' was not specified in the image metadata
  (See https://libvirt.org/kbase/backing_chains.html for
  troubleshooting)

  Bug #1864020 reports similar symptoms, where due to an upstream change
  in Libvirt v6.0.0+ images need the backing format specified.

  The fix for Bug #1864020 handles the case for new instances. However,
  for upgraded instances we're hitting the same problem, as those still
  don't have backing format specified.

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