Description of problem: When the authority for client's caps is being exported, it remains uninformed. Therefore, client does not send renew messagess to the correct MDS, fails to reconnect properly, stays in stale state and gets evicted repeatedly. This bug was found with "client_reconnect_stale = true" in client section and "mds session blacklist on evict = false" and "mds session blacklist on timeout = false" in mds section of ceph.conf.
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHBA-2018:2375