From owner-freebsd-current@FreeBSD.ORG  Mon Apr 12 19:10:06 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 3D07316A4CE
	for <freebsd-current@freebsd.org>;
	Mon, 12 Apr 2004 19:10:06 -0700 (PDT)
Received: from fledge.watson.org (fledge.watson.org [204.156.12.50])
	by mx1.FreeBSD.org (Postfix) with ESMTP id D6AEA43D46
	for <freebsd-current@freebsd.org>;
	Mon, 12 Apr 2004 19:10:05 -0700 (PDT)
	(envelope-from robert@fledge.watson.org)
Received: from fledge.watson.org (localhost [127.0.0.1])
	by fledge.watson.org (8.12.10/8.12.10) with ESMTP id i3D29VPq021626;
	Mon, 12 Apr 2004 22:09:31 -0400 (EDT)
	(envelope-from robert@fledge.watson.org)
Received: from localhost (robert@localhost)i3D29VrG021623;
	Mon, 12 Apr 2004 22:09:31 -0400 (EDT)
	(envelope-from robert@fledge.watson.org)
Date: Mon, 12 Apr 2004 22:09:31 -0400 (EDT)
From: Robert Watson <rwatson@freebsd.org>
X-Sender: robert@fledge.watson.org
To: Randy Bush <randy@psg.com>
In-Reply-To: <16507.18229.168158.735721@roam.psg.com>
Message-ID: <Pine.NEB.3.96L.1040412220557.19867C-100000@fledge.watson.org>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
cc: FreeBSD Current <freebsd-current@freebsd.org>
Subject: Re: very current won't mount /tmp
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 Apr 2004 02:10:06 -0000


On Tue, 13 Apr 2004, Randy Bush wrote:

> >> ok, so with just-now current, i get a trap 12 for a write into a freed
> >> page
> >> is there any way i can scrape the screen, or do i have to get a second
> >> machine and type all that gibberish? 
> > Well, the three common options are:
> > - serial console
> 
> none
> 
> > - dump, if you can get it
> 
> can't
> 
> > - camera or other capture device
> 
> http://rip.psg.com/~randy/040413.crash-ddb/

:-( Something is walking on memory after freeing it, but it's not
immediately clear what.  If you boot single-user and don't mount file
systems, etc, does running commands result in a panic?  Assuming for a
moment that it doesn't panic, it would be interesting to try mounting nfs,
etc, incrementally until it does crash.  If it does panic even from
single-user mode, it sounds like some incremental backouts are called :-(.

If you back out a week or so (is that possible?) does life get better?

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