I don't have a lot of experience with rbd-nbd but i suppose it works same with rbd. We use xen as hypervisor and sometimes when there is a crash, we need to remove the locks on the volumes when remapping them as these are dead locks.
Now removing the locks will sometimes put blacklist on these addresses with client id and then you just need to remove the blacklists. To check the blacklists do "ceph osd dump |grep blacklist"
Or put it in a script as well:
for i in `ceph osd dump |grep blacklist |awk '{print $2}'` ;do ceph osd blacklist rm $i;done
This article helped me a while ago and understood the dead locks on rbd volumes.
https://der-jd.de/blog/2018/12/27/openstack-ceph-luminous-upgrade.html
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