You can check the lock lists on each rbd and you can try removing the lock but 
only when the vm is shutdown and rbd is not used

rbd lock list pool/volume-id
rbd lock rm pool/volume-id "lock_id" client_id

This was a bug in luminous upgrade i believe and i found it back in the days 
from this article but seems the link doesn't work now
https://der-jd.de/blog/2018/12/27/openstack-ceph-luminous-upgrade.html
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