This is caused because the libvirt-qemu user is added to the nova group
as part of the nova-compute-libvirt package post-install script.
Following up on comment #17 above, the user/group of the delta file
changes from nova:nova to libvirt-qemu:kvm, whereas in comment #21
above, the user/group of the delta file changes to nova:kvm.
Dropping libvirt-qemu from nova in /etc/group fixes this as a work-
around. I'm building packages with a fix now and will get this fixed for
ussuri and victoria.
Marking the upstream bug as invalid.
** Changed in: nova
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1896617
Title:
[SRU] Creation of image (or live snapshot) from the existing VM fails
if libvirt-image-backend is configured to qcow2 starting from Ussuri
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