From owner-freebsd-current@FreeBSD.ORG  Sat Jun 25 17:32:20 2005
Return-Path: <owner-freebsd-current@FreeBSD.ORG>
X-Original-To: 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 8E1A416A41C
	for <current@freebsd.org>; Sat, 25 Jun 2005 17:32:20 +0000 (GMT)
	(envelope-from pho@holm.cc)
Received: from relay02.pair.com (relay02.pair.com [209.68.5.16])
	by mx1.FreeBSD.org (Postfix) with SMTP id 2303843D55
	for <current@freebsd.org>; Sat, 25 Jun 2005 17:32:19 +0000 (GMT)
	(envelope-from pho@holm.cc)
Received: (qmail 37070 invoked from network); 25 Jun 2005 17:32:18 -0000
Received: from unknown (HELO peter.osted.lan) (unknown)
	by unknown with SMTP; 25 Jun 2005 17:32:18 -0000
X-pair-Authenticated: 80.161.118.233
Received: from peter.osted.lan (localhost.osted.lan [127.0.0.1])
	by peter.osted.lan (8.13.1/8.13.1) with ESMTP id j5PHWHSn024327;
	Sat, 25 Jun 2005 19:32:17 +0200 (CEST)
	(envelope-from pho@peter.osted.lan)
Received: (from pho@localhost)
	by peter.osted.lan (8.13.1/8.13.1/Submit) id j5PHWHtG024326;
	Sat, 25 Jun 2005 19:32:17 +0200 (CEST) (envelope-from pho)
Date: Sat, 25 Jun 2005 19:32:17 +0200
From: Peter Holm <peter@holm.cc>
To: Mike Silbersack <silby@silby.com>
Message-ID: <20050625173217.GA24306@peter.osted.lan>
References: <20050624212729.C537@odysseus.silby.com>
	<20050625133052.GA23599@peter.osted.lan>
	<1437.64.215.82.94.1119717536.squirrel@webmail2.pair.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <1437.64.215.82.94.1119717536.squirrel@webmail2.pair.com>
User-Agent: Mutt/1.4.2.1i
Cc: current@freebsd.org, Thierry Herbelot <thierry@herbelot.com>
Subject: Re: Mbuf double-free guilty party detection patch
X-BeenThere: freebsd-current@freebsd.org
X-Mailman-Version: 2.1.5
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: Sat, 25 Jun 2005 17:32:20 -0000

On Sat, Jun 25, 2005 at 12:38:56PM -0400, Mike Silbersack wrote:
> > Didn't have much luck with your patch:
> >
> > x.123b:This memory last freed by: 0
> > x.123b-panic: Memory modified after free 0xc25a7100(256) val=0 @
> > 0xc25a7100
> > --
> > x.123c:This memory last freed by: 0
> > x.123c-panic: Memory modified after free 0xc1f60e00(256) val=0 @
> > 0xc1f60e00
> 
> Interesting on those two...
> 
> > x.123e:This memory last freed by: 0xc2fa6c00
> > x.123e-panic: Memory modified after free 0xc2fa6a00(256) val=c2fa6c00 @
> > 0xc2fa6a00
> >
> > - Peter
> 
> Now do a "x 0xc2fa6c00" in DDB to find out who was calling m_free.
> 

(kgdb) x/40x 0xc2fa6a00
0xc2fa6a00:   0xc2fa6c00    0x00000000    0xc24b1ae0    0x00000520
0xc2fa6a10:   0x00008003    0xdead0001    0x00000000    0x000005a8
0xc2fa6a20:   0xdeadc0de    0x00000000    0xdeadc0de    0x00000000
0xc2fa6a30:   0x00000000    0x00000000    0x00000000    0x00000800
0xc2fa6a40:   0xc24ad15c    0x00000003    0xdeadc0de    0xdeadc0de
0xc2fa6a50:   0xdeadc0de    0xdeadc0de    0xdeadc0de    0xdeadc0de
0xc2fa6a60:   0xdeadc0de    0xdeadc0de    0xdeadc0de    0xdeadc0de
0xc2fa6a70:   0xdeadc0de    0xdeadc0de    0xdeadc0de    0xdeadc0de
0xc2fa6a80:   0xdeadc0de    0xdeadc0de    0xdeadc0de    0xdeadc0de
0xc2fa6a90:   0xdeadc0de    0xdeadc0de    0xdeadc0de    0xdeadc0de

> Mike "Silby" Silbersack

-- 
Peter Holm