Created attachment 1450404 [details]
active-mds.2 log

Description of problem:
With reference to BZ "1572555" comment 12,cleanup of dirs in the  mount point with command 'rm -rf' was hung(No IOs ran in mount point) with 2 fuse clients only, no kernel clients.
Ceph status output:
==================
[root@ceph-prsurve-run488-node12-mds ceph]# ceph -s
  cluster:
    id:     8025f5f4-3a37-4974-886d-ba181cd7848a
    health: HEALTH_WARN
            1 MDSs report slow requests
 
  services:
    mon: 3 daemons, quorum ceph-prsurve-run488-node14-monmgr,ceph-prsurve-run488-node15-monmgr,ceph-prsurve-run488-node1-monmgrinstaller
    mgr: ceph-prsurve-run488-node15-monmgr(active), standbys: ceph-prsurve-run488-node14-monmgr, ceph-prsurve-run488-node1-monmgrinstaller
    mds: cephfs-2/2/2 up  {0=ceph-prsurve-run488-node3-mds=up:active,1=ceph-prsurve-run488-node12-mds=up:active}, 2 up:standby
    osd: 12 osds: 12 up, 12 in
 
  data:
    pools:   3 pools, 192 pgs
    objects: 97 objects, 195 MB
    usage:   2000 MB used, 345 GB / 347 GB avail
    pgs:     192 active+clean
=================
"1 MDSs report slow requests" warning occurred while running 'rm -rf'. 
RAM utilization of mds.1:
==========================================
root@ceph-prsurve-run488-node12-mds ceph]# free -h
              total        used        free      shared  buff/cache   available
Mem:           7.6G        446M        5.4G         17M        1.8G        6.9G
Swap:            0B          0B          0B
===========================================
RAM utilization of mds.0:
===========================================
[root@ceph-prsurve-run488-node3-mds ~]# free -h
              total        used        free      shared  buff/cache   available
Mem:           7.6G        257M        5.6G         17M        1.8G        7.0G
Swap:            0B          0B          0B
==========================================



Version-Release number of selected component (if applicable):

ceph version 12.2.5-25.el7cp (9987a3f5bbd16358cd1fdda2f48b93a757de9f95) luminous (stable)
RHEL 7.5

How reproducible:
Always

Steps to Reproduce:
1.Setup ceph 3.1 cluster,then follow BZ 1572555 comment 12,
2.Do cleanup in the mount point

Actual results:
command 'rm -rf' hangs

Expected results:
Cleanup in the mount point should be successful


Additional info:
If mds.1 service is restarted ,cluster's health becomes HEALTH_OK and 'rm -rf' command executes successfully.