From owner-freebsd-current@FreeBSD.ORG  Tue Jul 13 19:42:25 2004
Return-Path: <owner-freebsd-current@FreeBSD.ORG>
Delivered-To: freebsd-current@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP
	id F3D5216A4CE; Tue, 13 Jul 2004 19:42:24 +0000 (GMT)
Received: from fledge.watson.org (fledge.watson.org [204.156.12.50])
	by mx1.FreeBSD.org (Postfix) with ESMTP
	id A382843D2F; Tue, 13 Jul 2004 19:42:24 +0000 (GMT)
	(envelope-from robert@fledge.watson.org)
Received: from fledge.watson.org (localhost [127.0.0.1])
	by fledge.watson.org (8.12.11/8.12.11) with ESMTP id i6DJgAas017361;
	Tue, 13 Jul 2004 15:42:10 -0400 (EDT)
	(envelope-from robert@fledge.watson.org)
Received: from localhost (robert@localhost)i6DJg9Af017355;
	Tue, 13 Jul 2004 15:42:10 -0400 (EDT)
	(envelope-from robert@fledge.watson.org)
Date: Tue, 13 Jul 2004 15:42:09 -0400 (EDT)
From: Robert Watson <rwatson@FreeBSD.org>
X-Sender: robert@fledge.watson.org
To: Daniel Lang <dl@leo.org>
In-Reply-To: <20040711100553.GA64553@atrbg11.informatik.tu-muenchen.de>
Message-ID: <Pine.NEB.3.96L.1040713154136.88111H-100000@fledge.watson.org>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
cc: Don Lewis <truckman@FreeBSD.org>
cc: ps@FreeBSD.org
cc: current@FreeBSD.org
Subject: Re: panic: m_copym, length > size of mbuf chain
X-BeenThere: freebsd-current@freebsd.org
X-Mailman-Version: 2.1.1
Precedence: list
List-Id: Discussions about the use of FreeBSD-current
	<freebsd-current.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>,
	<mailto:freebsd-current-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-current>
List-Post: <mailto:freebsd-current@freebsd.org>
List-Help: <mailto:freebsd-current-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>,
	<mailto:freebsd-current-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Tue, 13 Jul 2004 19:42:25 -0000


On Sun, 11 Jul 2004, Daniel Lang wrote:

> referring to your first answer, the 'len' parameter in the tcp_output.c
> frame is 1460, offset is 737. The sum is obviously greater than 975, the
> value of so->so_snd.sb_cc. 
> 
> So the suggested assertion from Robert would have been triggered. I
> consider now adding the SOCKBUF_DEBUG value. However, with SACK
> disabled, the machine is still up and running now. 

Is it possible to get the box running with SACK again for debugging
purposes?  Resolving this issue would be a very good thing.  Thanks!

Robert N M Watson             FreeBSD Core Team, TrustedBSD Projects
robert@fledge.watson.org      Principal Research Scientist, McAfee Research