Hi, Experts, we have an cephfs cluster 16.2.* run with multi active mds, and we have some old machine run with ubuntu 16.04 , so we mount these client using ceph-fuse. After a full mds process restart, all of these old ubuntu 16.04 clients cannot connect to ceph , `ls -lrth` or `df -hT` hang on the client node. and we can see mds log said `evicting unresponsive client *** after waiting ** seconds during restart` also checking the client node, no ceph-fuse process, (ps -ef | grep ceph or ps -ef | grep fuse). but there is a remount process (ps -ef | grep mount) in the client node. root 176516 1 0 01:38 ? 00:00:00 mount -i -o remount /data cannot kill this process using `sudo kill -9 176516`. we really need experts help us how to save this client out of hang. we cannot restart this client node due to there are some other critical service. Thanks a ton. zx