network lock manager (lockd) deadlocked in 'rpcrecv'

[John Hein]

I have a home directory on FreeBSD 7.2-stable (20090705), amd64.
It is serving up the directory over nfs (v3, tcp), and now
I'm seeing lots of 'lockd not responding' on Fedora 10 & 11 systems.

USER    PID  PPID   SID NI %CPU %MEM   VSZ   RSS  TT  WCHAN  STAT STARTED      TIME COMMAND
root    791     1   791  0  0.0  0.0  6748  1500  ??  rpcrec Ds    2:45PM   0:05.80 /usr/sbin/rpc.lockd

Once lockd gets in this state, doing a test lock on a file
from a FreeBSD box locks with 'lockd not responding', too
(and ctrl-c and kill -9 does nothing).

USER         PID  PPID   SID NI %CPU %MEM   VSZ   RSS  TT  WCHAN  STAT STARTED      TIME COMMAND
jhein       6297  3491  3491  0  0.0  0.0  1412   604  p5  nlmrcv T+    3:18PM   0:00.00 /h/jhein/nfslocktest /nfs/locktest


I see this on an i386 6.4-stable, too.