NFS umount deadlock when unmounting with lazy option on Red Hat Enterprise Linux
Issue
- Commands accessing NFS files hang
- rpciod becomes stuck in rpc_shutdown_client() after umount
-
We have several servers that hang on reboot. Each time this happens the console scrolls rpc mount errors:
Shutting down interface bond0: bonding: bond0: releasing active interface eth0 bonding: bond0: making interface 3 the new active one. bonding: bond0: releasing active interface eth3 [ OK ] Shutting down loopback interface: [ OK ] Starting killall: [ OK ] Sending all processes the TERM signal... [ OK ] Sending all processes the KILL signal... [ OK ] Turning off swap: [ OK ] Unmounting pipe file systems: [ OK ] Unmounting file systems: [ OK ] Please stand by while rebooting the system... [ OK ] RPC: error 101 connecting to server NFS-server1.example.net RPC: error 101 connecting to server NFS-server2.example.net
Environment
- Red Hat Enterprise Linux including:
- Red Hat Enterprise Linux 4 - all versions.
- Red Hat Enterprise Linux 5 - prior to RHEL5 (kernels prior to 2.6.18-194.el5)
- NFS client mounts
- Unmounting nfs mounts using "lazy" (-l) option; or
- Unmounting nfs shares using netfs stop script (RHEL4 only).
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