From nobody@FreeBSD.org Tue May 8 19:35:06 2007 Return-Path: Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id 553F816A400 for ; Tue, 8 May 2007 19:35:06 +0000 (UTC) (envelope-from nobody@FreeBSD.org) Received: from www.freebsd.org (www.freebsd.org [69.147.83.33]) by mx1.freebsd.org (Postfix) with ESMTP id 46D0813C45D for ; Tue, 8 May 2007 19:35:06 +0000 (UTC) (envelope-from nobody@FreeBSD.org) Received: from www.freebsd.org (localhost [127.0.0.1]) by www.freebsd.org (8.13.1/8.13.1) with ESMTP id l48JZ6sp054020 for ; Tue, 8 May 2007 19:35:06 GMT (envelope-from nobody@www.freebsd.org) Received: (from nobody@localhost) by www.freebsd.org (8.13.1/8.13.1/Submit) id l48JU3Em045259; Tue, 8 May 2007 19:30:03 GMT (envelope-from nobody) Message-Id: <200705081930.l48JU3Em045259@www.freebsd.org> Date: Tue, 8 May 2007 19:30:03 GMT From: Seraphi To: freebsd-gnats-submit@FreeBSD.org Subject: NFS over TCP under load hangs with "impossible packet length" X-Send-Pr-Version: www-3.0 >Number: 112529 >Category: amd64 >Synopsis: NFS over TCP under load hangs with "impossible packet length" >Confidential: no >Severity: serious >Priority: high >Responsible: freebsd-amd64 >State: closed >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Tue May 08 19:40:04 GMT 2007 >Closed-Date: Tue May 08 21:12:20 GMT 2007 >Last-Modified: Tue May 08 21:12:20 GMT 2007 >Originator: Seraphi >Release: 6.2-RELEASE-p4 >Organization: >Environment: FreeBSD nfsclient05.domain.com 6.2-RELEASE-p4 FreeBSD 6.2-RELEASE-p4 #0: Tue May 8 13:59:19 EDT 2007 admin@nfsclient05.domain.com:/usr/obj/usr/src/sys/MYKERN_62_05042007 amd64 >Description: NFS over UDP will hang under load and throw the following errors to syslog: May 8 14:36:55 nfsclient05 kernel: impossible packet length (13050202) from nfs server 192.168.101.12:/store22 May 8 14:36:56 nfsclient05 kernel: impossible packet length (1669907873) from nfs server 192.168.101.12:/store22 May 8 14:37:01 nfsclient05 kernel: impossible packet length (46381) from nfs server 192.168.101.12:/store22 I have tried many mount options, but here is one set that will have this problem: 192.168.101.12:/store22 /s22 nfs ro,-i,-b,-3,-T,-r=16384,-w=16384 0 0 To get the error to occur, I simply copy a multi-gig file from NFS to a local drive. It happens very frequently. I have only tried this on gigabit networks. The error goes away if I use UDP, which is what I am using until this is fixed. I have tried this on FreeBSD 6.1 as well and had the same problem. I have also tried a different NFS server running a different OS on a different network with a different configuration on different hardware. It did not help. I have tried updating with freebsd-update but the status is unchanged. >How-To-Repeat: Put an NFS client and server on a gigabit network. Mount the server using TCP: 192.168.101.12:/store22 /s22 nfs ro,-i,-b,-3,-T,-r=16384,-w=16384 0 0 Copy a large file (1GB+) from the NFS mount to a local drive. Do this a couple of times, then check /var/log/messages >Fix: Use UDP: 192.168.101.12:/store22 /s22 nfs ro,-i,-b,-3,-U,-r=16384,-w=16384 0 0 >Release-Note: >Audit-Trail: From: Seraphi To: bug-followup@FreeBSD.org Cc: Subject: Re: amd64/112529: NFS over TCP under load hangs with "impossible packet length" Date: Tue, 8 May 2007 16:02:56 -0400 ------=_Part_99612_6233867.1178654576430 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Content-Disposition: inline This is a duplicate of 112528. This can be removed. On 5/8/07, FreeBSD-gnats-submit@freebsd.org < FreeBSD-gnats-submit@freebsd.org> wrote: > > Thank you very much for your problem report. > It has the internal identification `amd64/112529'. > The individual assigned to look at your > report is: freebsd-amd64. > > You can access the state of your problem report at any time > via this link: > > http://www.freebsd.org/cgi/query-pr.cgi?pr=112529 > > >Category: amd64 > >Responsible: freebsd-amd64 > >Synopsis: NFS over TCP under load hangs with "impossible packet > length" > >Arrival-Date: Tue May 08 19:40:04 GMT 2007 > ------=_Part_99612_6233867.1178654576430 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline This is a duplicate of 112528. This can be removed.

On 5/8/07, FreeBSD-gnats-submit@freebsd.org <FreeBSD-gnats-submit@freebsd.org > wrote:
Thank you very much for your problem report.
It has the internal identification `amd64/112529'.
The individual assigned to look at your
report is: freebsd-amd64.

You can access the state of your problem report at any time
via this link:

http://www.freebsd.org/cgi/query-pr.cgi?pr=112529

>Category:       amd64
>Responsible:    freebsd-amd64
>Synopsis:       NFS over TCP under load hangs with "impossible packet length"
>Arrival-Date:   Tue May 08 19:40:04 GMT 2007

------=_Part_99612_6233867.1178654576430-- State-Changed-From-To: open->closed State-Changed-By: jmg State-Changed-When: Tue May 8 21:11:48 UTC 2007 State-Changed-Why: dup of 112528 per submitter http://www.freebsd.org/cgi/query-pr.cgi?pr=112529 >Unformatted: