nfs lock failure/hang when using alias address for server from linux
jwd at SlowBlink.Com
Sun Aug 21 04:13:09 UTC 2011
I have an nfs server running 9-current. Everything works as far
as nfs i/o operations are concerned.
From another FreeBSD box, nfs locking works great to the server
when addressed by both it's real ip address and it's aliased ip
From a Linux system:
Linux bb05d6403.unx.sas.com 2.6.32-131.0.15.el6.x86_64 #1 SMP Tue May 10 15:42:40 EDT 2011 x86_64 x86_64 x86_64 GNU/Linux
nfs locking works fine if the mount goes to the real ip address
of the server. If, however, the server is mounted by using it's aliased
ip address, while nfs i/o operations work fine, file locking hangs.
On the server, the processes:
root 5995 0.0 0.0 14272 1920 ?? Ss 3:48PM 0:05.33 /usr/sbin/rpcbind -h 10.24.6.38 -h 188.8.131.52 -h 10.24.6.33 -h 10.24.6.34
root 6021 0.0 0.0 12316 2364 ?? Ss 3:48PM 0:00.65 /usr/sbin/mountd -r -l -h 10.24.6.38 -h 184.108.40.206 -h 10.24.6.33 -h 10.24.6.34
root 6048 0.0 0.0 10060 1864 ?? Ss 3:48PM 0:00.10 nfsd: master (nfsd)
root 6049 0.0 0.0 10060 1368 ?? S 3:48PM 0:00.20 nfsd: server (nfsd)
root 6074 0.0 0.0 274432 2084 ?? Is 3:48PM 0:00.03 /usr/sbin/rpc.statd -d -h 10.24.6.38 -h 220.127.116.11 -h 10.24.6.33 -h 10.24.6.34
root 6099 0.0 0.0 14400 1780 ?? Ss 3:48PM 0:00.03 /usr/sbin/rpc.lockd -d 9 -h 10.24.6.38 -h 18.104.22.168 -h 10.24.6.33 -h 10.24.6.34
The server is accessed by udp in addition to tcp thus the -h
options for each address. Nfsv4 is not enabled at this time. I have
the debug output of statd & lockd running to /var/log via syslog but
nothing useful shows up.
The interface configuration:
bce0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
inet 10.24.6.38 netmask 0xffff0000 broadcast 10.24.255.255
inet6 fe80::862b:2bff:fefd:a1fc%bce0 prefixlen 64 scopeid 0x1
inet 10.24.6.33 netmask 0xffffffff broadcast 10.24.255.255
inet 10.24.6.34 netmask 0xffffffff broadcast 10.24.255.255
media: Ethernet autoselect (1000baseT <full-duplex>)
Above, a mount to 10.24.6.38 works. A mount to either 10.24.6.33
or 10.24.6.34 works for nfs i/o operations, but hangs for lock requests.
I'd like this to work so I can transistion some volumes around to
Does anyone have any thoughts on the best way to debug this? I've looked
at what I believe are the obvious areas. I'll probably start looking more
closely at tcpdump next.
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