This bug was initially created as a copy of Bug #2224242 I am copying this bug because: If just before the revoke request, which will increase the 'seq', is sent out the clients released the corresponding caps and sent out the cap update request with old 'seq', the mds will miss checking the seqs and calculating the caps. We should always send an ack for revoke requests. Fixes: https://tracker.ceph.com/issues/61782
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