Something similar happened again[1] (it is now visible in cinder side and failing another tempest test case test_volume_backup_restore) Still I agree that it is low frequency.
[1] https://ddbcd145bedf294c8288-f0a55fc4957fe55450e72f1f6d277d79.ssl.cf1.rackcdn.com/796208/4/gate/nova-ceph-multistore/4fde70b/controller/logs/screen-c-vol.txt
Something similar happened again[1] (it is now visible in cinder side and failing another tempest test case test_volume_ backup_ restore) Still I agree that it is low frequency.
[1] https:/ /ddbcd145bedf29 4c8288- f0a55fc4957fe55 450e72f1f6d277d 79.ssl. cf1.rackcdn. com/796208/ 4/gate/ nova-ceph- multistore/ 4fde70b/ controller/ logs/screen- c-vol.txt