Re: NFS clients hang on server

["Costa, Jeff" <jcosta lendlease com>]

I'm seeing the same problem. NFSv3 between two RHEL4 servers
(2.6.9-22.ELsmp) hangs the shell on the NFS client. I have to initiate a
new SSH session, and the NFS mount command shows up in the process list
in uninterruptible sleep, and cannot be killed:

1383 ?        D      0:00 mount uklon01lt401:/d90 /mnt 

This is being done without IPTABLES running, with the proper exports
verified, and with the proper services running.

You can see the client mount request hit the NFS server, like this:
Apr 10 00:06:32 uklon01lt401 rpc.mountd: authenticated mount request
from uklon01lt402.emea.com:817 for /d90 (/d90) 

And the client netstat then shows the connection going into WAIT status:
tcp        0      0 172.1.1.252:32798          172.1.1.250:2049
TIME_WAIT   -
tcp        0      0 172.1.1.252:32797          172.1.1.250:111
TIME_WAIT  


But still, nothing happens. I've even tried stracing the client's NFS
mount request. It also hangs, and ends with this statement:

uname({sys="Linux", node="uklon01lt402", ...}) = 0
rt_sigprocmask(SIG_BLOCK, ~[TRAP SEGV RTMIN RT_1], NULL, 8) = 0
mount("uklon01lt401:/d90", "/mnt", "nfs",
MS_POSIXACL|MS_ACTIVE|MS_NOUSER|0xec0000,  

Anybody have any good ideas? What's blocking the NFS mount request?

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