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Date: Mon, 22 Sep 1997 00:38:48 +0200 (MET DST)
From: Tor Egge <Tor.Egge@idi.ntnu.no>
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To: FreeBSD-gnats-submit@FreeBSD.ORG
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Subject: kern/4600: nfs lookups might give incorrect result
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>Number:         4600
>Category:       kern
>Synopsis:       nfs lookups might give incorrect result
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Sun Sep 21 15:40:00 PDT 1997
>Last-Modified:
>Originator:     Tor Egge
>Organization:
Norwegian University of Science and Technology, Trondheim, Norway
>Release:        FreeBSD 3.0-CURRENT i386
>Environment:

FreeBSD ikke.idi.ntnu.no 3.0-CURRENT FreeBSD 3.0-CURRENT #0: Sun Sep 21 19:58:26 MET DST 1997     root@ikke.idi.ntnu.no:/usr/src/sys/compile/TEGGE_SMP  i386

>Description:

The nfs lookup method does not take into account that 
files might have been moved on the nfs server.

>How-To-Repeat:

on NFS server:

	mkdir test
	mkdir test/OLD
	echo 42 > test/1

on NFS client:

	ls -l test
	cat test/1

on NFS server:

	mv test/1 test/OLD/1

wait until nfs attribute cache entries times out (60 seconds), then on NFS
client:

	ls -l test
	cat test/1

Unless resource starvation has flushed the namecache entries on the
NFS client, the contents of test/OLD/1 is shown during the cat operation,
even though the ls output indicates that test/1 does not exist.

>Fix:
>Audit-Trail:
>Unformatted: