It appears ubuntu bionic/focal ship with libvirt < 6.1.0, marking nova
as affected in those distribs
** Also affects: nova (Ubuntu)
Importance: Undecided
Status: New
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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
Status in nova package in Ubuntu:
New
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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