NetBSD Problem Report #47340

From reinoud@13thmonkey.org  Sun Dec 16 18:42:18 2012
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Message-Id: <20121216184217.1200433D4FF8@nas.13thmonkey.org>
Date: Sun, 16 Dec 2012 19:42:16 +0100 (CET)
From: reinoud@NetBSD.org
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To: gnats-bugs@gnats.NetBSD.org
Subject: NFS resend problem with stale NFS file handles
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>Number:         47340
>Category:       kern
>Synopsis:       NFS resend problem with stale NFS file handles
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Dec 16 18:45:01 +0000 2012
>Originator:     Reinoud Zandijk
>Release:        NetBSD 6.0_BETA2
>Organization:
NetBSD

>Environment:



	Two NetBSD systems; this one, the NAS running the NFS server. The other
	machine, heethofdje, mounts a /home with:

	nas:/home /home nfs rw,soft,intr,tcp 0 0

	'heethoofdje' runs: NetBSD heethoofdje.13thmonkey.org 6.0_BETA2 NetBSD 6.0_BETA2 (GENERIC)	i386
	`heethoofdje' runs a linux binary version of openoffice3-bin-3.2.1nb2

System: NetBSD nas.13thmonkey.org 6.0_BETA2 NetBSD 6.0_BETA2 (MARVELL_NAS) #6: Wed Jul 11 10:23:35 CEST 2012 root@nas.13thmonkey.org:/usr/sources/cvs.netbsd.org/src-6/sys/arch/evbarm/compile/MARVELL_NAS evbarm
Architecture: arm
Machine: evbarm
>Description:


	In normal usage, OpenOffice crashed and started recovering a document
	for restart probably.

	The NAS became unresponsive; pinging/telnet to 80 worked but ssh and
	named were almost not accessablei/usable. NFS iseems to work fine. It
	turned out that the the network was flooding:

	19:22:43.022146 IP 192.168.1.2.3203978003 > 192.168.1.1.nfs: 120 read fh 16,4/33664198 17720 bytes @ 0
	19:22:43.022491 IP 192.168.1.1.nfs > 192.168.1.2.3203978003: reply ok 32 read ERROR: Stale NFS file handle
	19:22:43.022533 IP 192.168.1.2.3203978004 > 192.168.1.1.nfs: 120 read fh 16,4/33664198 17720 bytes @ 0
	19:22:43.022874 IP 192.168.1.1.nfs > 192.168.1.2.3203978004: reply ok 32 read ERROR: Stale NFS file handle
	19:22:43.022916 IP 192.168.1.2.3203978005 > 192.168.1.1.nfs: 120 read fh 16,4/33664198 17720 bytes @ 0
	19:22:43.023261 IP 192.168.1.1.nfs > 192.168.1.2.3203978005: reply ok 32 read ERROR: Stale NFS file handle
	.....
	etc. etc.

>How-To-Repeat:

	Unknown 
>Fix:
	Explicit killing the hung OpenOffice fixed the storm.



>Unformatted:

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