NFS write error on 2650, RH 7.3

Mansell, Gary GRMansell at ricardo.com
Tue Mar 18 03:01:00 CST 2003


What kernel version are you running - I experienced nfs subsytem lockups with 2.4.18-5smp. this was due to a bug in lockd which was fixed in later versions.


Gary Mansell
Senior Technical Analyst
IT Department
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-----Original Message-----
From: David C. Kovar [mailto:kovar at kealia.com]
Sent: 18 March 2003 00:02
To: linux-poweredge at dell.com
Subject: NFS write error on 2650, RH 7.3


Good afternoon,

We're running RH 7.3 with the latest kernel on a 2650. If we try to
write one specific file out to a NFS partition mounted from a nearly
identical 2650 fileserver, the write and the entire NFS mount hangs. We
need to restart NFS on the client to clear the problem.

The fileserver has ext3 partitions on a hardware RAID. Latest 7.3
kernel, very generic system.

I can reproduce the problem reliably using 7.3 clients. 

7.1 clients do not exhibit this problem. 

Writing this file to a nearly identical fileserver that was cloned from
the original one does not exhibit this problem.

Writing the file on the fileserver itself does not cause the problem.

A tcpdump of the end of the exchange produces the following. If anyone
can assist me in determining what is going on here, I would greatly
appreciate it. 

-David

These will cycle endlessly. And yes, the fileserver's name is
"fileserver".


15:24:48.333528 bee02.2349057636 > fileserver.nfs: 1472 write fh
Unknown/010000020008000501800000C60279005EA646ABE80279000000000000006000
4096 bytes @ 0x000006000 <unstable> (frag 36636:1480 at 0+) (ttl 64, len
1500)
15:24:51.130036 bee02 > fileserver: (frag 36637:1276 at 2960) (ttl 64, len
1296)
15:24:51.130049 bee02 > fileserver: (frag 36637:1480 at 1480+) (ttl 64, len
1500)
15:24:51.130059 bee02.2349057636 > fileserver.nfs: 1472 write fh
Unknown/010000020008000501800000C60279005EA646ABE80279000000000000006000
4096 bytes @ 0x000006000 <unstable> (frag 36637:1480 at 0+) (ttl 64, len
1500)
15:24:56.723114 bee02 > fileserver: (frag 36638:1276 at 2960) (ttl 64, len
1296)
15:24:56.723126 bee02 > fileserver: (frag 36638:1480 at 1480+) (ttl 64, len
1500)

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