User report: Asymmetric mount failures

User report: Asymmetric mount failures

[Chip Salzenberg]

I would appreciate some help diagnosing this Debian NFS bug report.
If they're using up-to-date Debian unstable as they say, they'll have
been using nfs-utils 1.0 on both machines.

----- Forwarded message from Nick Bailey <n.j.bailey@elec.gla.ac.uk> -----

Subject: Bug#81428: Possibly related mound problem?
From: Nick Bailey <n.j.bailey@elec.gla.ac.uk>
To: 81428@bugs.debian.org
Date: Tue, 06 Aug 2002 18:34:24 +0100

Hi!

I've been having serious difficulty using NFS-kernel-server too, and now 
have the situation where with identical hosts.{deny,allow} and exports, 
machine A can mount /etc from machine B, but not the other way around 
(I'm just using /etc for testing, of course)

So,

root@strauss:/etc# mount -t nfs cmtdb121:/etc /tmp/qqq

On cmtdb121, syslog shows:
Aug  6 18:26:54 cmtdb121 rpc.mountd: authenticated mount request from 
strauss:955 for /etc (/etc)

but...

cmtdb121:/etc# mount -t nfs strauss:/etc /tmp/qqq
mount: strauss:/etc failed, reason given by server: Permission denied

and strauss shows in its syslog:

Aug  6 18:27:25 strauss rpc.mountd: refused mount request from cmtdb121 
for /etc (/): no export entry

I note /etc is somehow referred to / on strauss (no idea why, but this 
would seem to be the cause of the problem), whereas it's correctly 
resolved as /etc on cmtdb121

cmtdb121 is a powerpc, Linux cmtdb121 2.4.18-powerpc #1 Thu Mar 14 
16:55:14 EST 2002 ppc unknown unknown GNU/Linux
Strauss is a dual AMD box with 2 NICs (one unconfigured): Linux strauss 
2.4.18-686-smp #2 SMP Wed Mar 20 20:24:14 EST 2002 i686 unknown unknown 
GNU/Linux

Both of bang-up-to-date Sid installs. the portmapper, nfs-common and 
nfs-kernel-servers have all been stopped and started in the appropriate 
order several times.

Two sysadmins and I have spent almost a whole day on this: I don't think 
it's obvious (although I'm pretty thick at reporting bugs sometimes and 
have dropped a few bricks, at least the sysadmins agree with me this time :)

If there are any other test I could make, please don't hesitate to ask.

Nick/

-- 
Dr Nick Bailey                              n.j.bailey@elec.gla.ac.uk
Centre for Music Technology                 http://cmt.gla.ac.uk/
Dept of Electronics and Electrical Eng      http://www.elec.gla.ac.uk/
The University of Glasgow                   http://www.gla.ac.uk

----- End forwarded message -----

-- 
Chip Salzenberg         - a.k.a.  -        <chip@pobox.com>
         "It furthers one to have somewhere to go."


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