Subject: kern/17145: NFS client freezes
To: None <>
From: Michael van Elst <>
List: netbsd-bugs
Date: 06/02/2002 23:02:30
>Number:         17145
>Category:       kern
>Synopsis:       NFS client freezes
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Jun 02 14:03:01 PDT 2002
>Originator:     Michael van Elst
>Release:        NetBSD 1.6_BETA1
	just me
System: NetBSD pepew 1.6_BETA1 NetBSD 1.6_BETA1 (PEPEW) #0: Sun Jun 2 00:14:31 MEST 2002 src@pepew:/amd/fud/d/0/src/sys/arch/i386/compile/PEPEW i386
Architecture: i386
Machine: i386
NFS-mounting the src filesystem with default mount parameters from
a NetBSD 1.5.3_RC2 server and doing a simple find /usr/src stops
after a few dozen files are listed.

The same worked fine when the NFS-client (pepew) was still running
NetBSD 1.5.3_RC2.

Sniffing the net shows that the client sends a readdir() request that
is answered by the server followed by a long delay. It is possible
that subsequent readdir() requests are just retries of the first.

If you do hard, non-intr mount and cause the freeze it is impossible
to break out and the system won't shut down properly.