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The "umount /var/lib/nfs/rpc_pipefs" always fails on rhel6 with case, but can't be reproduced by hand.
Just investigate it some more.
[03:00:24 root@ ~~]# service_nfs stop
Shutting down NFS daemon: [ OK ]
Shutting down NFS mountd: [ OK ]
Shutting down NFS quotas: [ OK ]
Shutting down RPC svcgssd: [ OK ]
Shutting down RPC idmapd: [ OK ]
:: [ PASS ] :: Running 'service_nfs stop' (Expected 0, got 0)
--------------------------------------------------------------------------------
[03:00:25 root@ ~~]# service_nfslock stop
Stopping NFS statd: [ OK ]
:: [ PASS ] :: Running 'service_nfslock stop' (Expected 0, got 0)
--------------------------------------------------------------------------------
[03:00:25 root@ ~~]# umount /var/lib/nfs/rpc_pipefs
umount: /var/lib/nfs/rpc_pipefs: device is busy.
(In some cases useful info about processes that use
the device is found by lsof(8) or fuser(1))
:: [ FAIL ] :: Running 'umount /var/lib/nfs/rpc_pipefs' (Expected 0, got 1)
--------------------------------------------------------------------------------
[03:00:25 root@ ~~]# mount | grep rpc_pipefs
sunrpc on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw)
:: [ FAIL ] :: No rpc_pipefs mount point (Expected 1, got 0)
The "umount /var/lib/nfs/rpc_pipefs" always fails on rhel6 with case, but can't be reproduced by hand. Just investigate it some more. [03:00:24 root@ ~~]# service_nfs stop Shutting down NFS daemon: [ OK ] Shutting down NFS mountd: [ OK ] Shutting down NFS quotas: [ OK ] Shutting down RPC svcgssd: [ OK ] Shutting down RPC idmapd: [ OK ] :: [ PASS ] :: Running 'service_nfs stop' (Expected 0, got 0) -------------------------------------------------------------------------------- [03:00:25 root@ ~~]# service_nfslock stop Stopping NFS statd: [ OK ] :: [ PASS ] :: Running 'service_nfslock stop' (Expected 0, got 0) -------------------------------------------------------------------------------- [03:00:25 root@ ~~]# umount /var/lib/nfs/rpc_pipefs umount: /var/lib/nfs/rpc_pipefs: device is busy. (In some cases useful info about processes that use the device is found by lsof(8) or fuser(1)) :: [ FAIL ] :: Running 'umount /var/lib/nfs/rpc_pipefs' (Expected 0, got 1) -------------------------------------------------------------------------------- [03:00:25 root@ ~~]# mount | grep rpc_pipefs sunrpc on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw) :: [ FAIL ] :: No rpc_pipefs mount point (Expected 1, got 0)