statd errors

Hello,

I'm running a simple NFS setup (one client, one server) using NFSv3 on Debian sarge (nfs-utils 1.0.6, and Linux 2.4.27 and 2.6.8 Debian kernels). I'm seeing the same problem with both kernel versions (plus vanilla kernel.org 2.6.[89]).

In my logs, I keep getting this message (on both the client and server):

Dec 14 11:59:54 till2 rpc.statd[2141]: Received erroneous SM_UNMON

request from till2 for 10.0.0.203

Looking through list archives with Google, it seems that this can be caused by:

1. /var/lib/nfs/sm* not being writable (it's writable, owned by root, and rpc.statd runs as root)
2. Name/IP address changes. This isn't happening either.

The file region locking works; using strace I can see that fcntl64 is used to get and set locks, and attempts to lock the same records on both systems give the appropriate errors in the application. I get the SM_UNMON error if I leave the client system alone for 5 minutes with no activity; when I next try an operation, I get the above error in the logs on both machines. With continuous operation, I still get the error periodically, but if I leave it alone for 5 minutes, it always occurs.

Please could anyone suggest how I might debug or fix this?

Many thanks,
Roger

Server Configuration (host till1, ip 10.0.0.203):
/etc/exports:
/srv/epic *(rw,sync,secure_locks,no_root_squash,no_wdelay,no_subtree_check) [using knfsd]

Client configuration (host till2, ip 10.0.0.204):
I use autofs4, which gives this mount:
automount(pid2099) on /var/autofs/net type autofs (rw,fd=4,pgrp=2099,minproto=2,maxproto=4)
till1:/srv/epic on /var/autofs/net/till1/srv/epic type nfs (rw,nosuid,nodev,hard,intr,nfsvers=3,posix,udp,rsize=8192,wsize=8192,addr=10.0.0.203)

This is the log in the server (nlm_debug is 65535):

Dec 14 12:02:25 till1 kernel: lockd: request from 0a0000cc
Dec 14 12:02:25 till1 kernel: lockd: LOCK          called
Dec 14 12:02:25 till1 kernel: lockd: nlm_lookup_host(0a0000cc, p=17, v=4)
Dec 14 12:02:25 till1 kernel: lockd: host garbage collection
Dec 14 12:02:25 till1 kernel: lockd: nlmsvc_mark_resources
Dec 14 12:02:25 till1 kernel: lockd: delete host 10.0.0.204
Dec 14 12:02:25 till1 kernel: lockd: nsm_unmonitor(10.0.0.204)
Dec 14 12:02:25 till1 kernel: nsm: xdr_encode_mon(0a0000cc, -1249509120, 67108864, 268435456)
Dec 14 12:02:25 till1 rpc.statd[1421]: Received erroneous SM_UNMON request from till1 for 10.0.0.204
Dec 14 12:02:25 till1 kernel: lockd: creating host entry
Dec 14 12:02:25 till1 kernel: lockd: nsm_monitor(10.0.0.204)
Dec 14 12:02:25 till1 kernel: nsm: xdr_encode_mon(0a0000cc, -1249509120, 67108864, 268435456)
Dec 14 12:02:25 till1 kernel: nsm: xdr_decode_stat_res status 0 state 181
Dec 14 12:02:25 till1 kernel: lockd: nlm_file_lookup(01000001 0400fe00 00010001 00010804 13bb0bdb 00000000)
Dec 14 12:02:25 till1 kernel: lockd: creating file for (01000001 0400fe00 00010001 00010804 13bb0bdb
00000000)
Dec 14 12:02:25 till1 kernel: lockd: found file c51aa1d0 (count 0)
Dec 14 12:02:25 till1 kernel: lockd: nlmsvc_lock(fe04/67588, ty=1, pi=2493, 805306370-805306371, bl=0)
Dec 14 12:02:25 till1 kernel: lockd: nlmsvc_lookup_block f=c51aa1d0 pd=2493 805306370-805306371 ty=1
Dec 14 12:02:25 till1 kernel: lockd: posix_lock_file returned 0
Dec 14 12:02:25 till1 kernel: lockd: LOCK          status 0
Dec 14 12:02:25 till1 kernel: lockd: release host 10.0.0.204
Dec 14 12:02:25 till1 kernel: lockd: nlm_release_file(c51aa1d0, ct = 1)
Dec 14 12:02:25 till1 kernel: nlmsvc_retry_blocked(00000000, when=0)
Dec 14 12:02:25 till1 kernel: nlmsvc_retry_blocked(00000000, when=0)
Dec 14 12:02:25 till1 kernel: lockd: request from 0a0000cc

This is the log in the client (nlm_debug is 65535, the time is slightly behind the server):

Dec 14 11:04:55 till2 kernel: lockd: nlm_lookup_host(0a0000cb, p=17, v=4)
Dec 14 11:04:55 till2 kernel: lockd: get host 10.0.0.203
Dec 14 11:04:55 till2 kernel: lockd: call procedure 4 on 10.0.0.203
Dec 14 11:04:55 till2 kernel: lockd: nlm_bind_host(0a0000cb)
Dec 14 11:04:55 till2 kernel: lockd: server returns status 0
Dec 14 11:04:55 till2 kernel: lockd: clnt proc returns 0
Dec 14 11:04:55 till2 kernel: lockd: release host 10.0.0.203
Dec 14 11:04:55 till2 kernel: lockd: release host 10.0.0.203
Dec 14 11:59:54 till2 kernel: lockd: nlm_lookup_host(0a0000cb, p=17, v=4)
Dec 14 11:59:54 till2 kernel: lockd: host garbage collection
Dec 14 11:59:54 till2 kernel: lockd: nlmsvc_mark_resources
Dec 14 11:59:54 till2 kernel: lockd: delete host 10.0.0.203
Dec 14 11:59:54 till2 kernel: lockd: nsm_unmonitor(10.0.0.203)
Dec 14 11:59:54 till2 rpc.statd[2141]: Received erroneous SM_UNMON request from till2 for 10.0.0.203
Dec 14 11:59:54 till2 kernel: lockd: creating host entry
Dec 14 11:59:54 till2 kernel: lockd: nlm_bind_host(0a0000cb)
Dec 14 11:59:54 till2 kernel: lockd: nsm_monitor(10.0.0.203)

Roger Leigh

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