From: Helge Bahmann <hcb@chaoticmind.net>
Subject: Re: NFSv3 server: lockd hangs
Date: Thu, 19 Oct 2006 16:14:33 +0200 (CEST)
Message-ID: <Pine.LNX.4.44.0610191558030.13593-100000@lothlorien.local>
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Trond Myklebust wrote:

> > Is there also a known problem with NFSv3 file locking and sec=krb5 mounts?
[snip]
> > Is there something I could do to diagnose the problem once the problem
> > starts appearing?
>
> cat /proc/locks on both the client and server. The 5th column there
> should be in the form 'device_major:device_minor:inode_number'. See if
> you can find a match for the file that is not supposed to be locked.

it just happened again; output from /proc/locks on the NFS client (only
for the relevant file):
1: POSIX  ADVISORY  WRITE 30962 00:16:976311 0 EOF

and again on the the server:
9: POSIX  ADVISORY  READ  30183 fe:09:976311 0 EOF
9: -> POSIX  ADVISORY  WRITE 30962 fe:09:976311 0 EOF

sure enough 30183 was the pid of (one of the) processes on the NFS client
that previously had the file locked (there is only one client machine ever
accessing that file); however there is no process (or thread, for that
matter) with the pid 30183 on the client anymore

it seems there is one program that reliably triggers the problem
(kcminit); I think I can now reproduce it -- what kind of traces
should I take to produce useful information?

Thanks and best regards
-- 
Helge Bahmann <hcb@chaoticmind.net>                     /| \__
The past: Smart users in front of dumb terminals       /_|____\
                                                     _/\ |   __)
Wer im finally-Block sitzt, sollte nicht             \\ \|__/__|
mit exceptions werfen.                                \\/___/ |
                                                        |


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