I am running an NFS (version 3 and 4) server on Red Hat Enterprise 5, upgraded
to kernel version 2.6.18-92.el5 a couple weeks ago. A couple days ago NFS file
locking quit completely. Any program that tried to lock a file would hang,
including this piece of Python code:
import fcntl
fp = open("lock-test4", "a")
fcntl.lockf(fp.fileno(), fcntl.LOCK_EX|fcntl.LOCK_NB)
A packet sniff showed periodic retransmissions of requests to the lock manager
port, and no replies. I am running iptables with that port (among others)
allowed through. Restarting iptables did not help. The only thing that did
help was a reboot. The next day the problem happened again; this time, when I
rebooted, I reverted to the older kernel, 2.6.18-53.1.4.el5. So far, it's run
a bit more than 24 hours without incident.
- any idea what might be going on?
- am I correct that this locking is handled in the kernel?
- is there a way of restarting locking short of rebooting?
- how would I go about debugging this further?
thanks,
Steve Gaarder
System Administrator, Dept of Mathematics
Cornell University, Ithaca, NY, USA
gaarder1@xxxxxxxxxxxxxxxx
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