Subject: bin/2894: amd works unreliable with NFS over TCP
To: None <>
From: Matthias Scheler <>
List: netbsd-bugs
Date: 10/26/1996 15:31:49
>Number:         2894
>Category:       bin
>Synopsis:       amd works unreliable with NFS over TCP
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    bin-bug-people (Utility Bug People)
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sat Oct 26 06:35:00 1996
>Originator:     Matthias Scheler
Matthias Scheler
>Release:        961022
System: NetBSD lyssa 1.2A NetBSD 1.2A (LYSSA) #1: Fri Oct 25 01:42:30 MEST 1996 tron@lyssa:/usr/src/sys/arch/i386/compile/LYSSA i386

A while ago I reconfigured "amd" on my two NetBSD 1.2 systems to use TCP
for automounted NFS filesystem. Since this change I experienced problems
with mounting filesystems. From time to time "amd" started to hang on a mount
attempt. If I were luckily it worked after 1-3 retries but sometimes I had
to kill and restart "amd". After a while I got fed up with this and
reconfigured "amd" to use UDP. After I compiled 961022 NetBSD 1.2A sources
I retried to use TCP and found out that the problem still exists. The
only thing which is logged if this happens is something like this:

Oct 13 15:59:41 colwyn /netbsd: nfs server amd:87: not responding
Oct 13 15:59:41 colwyn /netbsd: nfs server amd:87: is alive again

Use "amd" with option "tcp" to mount a NFS filesystem. Sooner or later it
will start to hang on mount attempts.

Sorry, but I don't even know wether this a problem with the automounter,
the NFS server or the kernel.