From owner-freebsd-current@FreeBSD.ORG  Wed Aug 20 16:14:59 2003
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 68A8616A4BF; Wed, 20 Aug 2003 16:14:59 -0700 (PDT)
Received: from storm.FreeBSD.org.uk (storm.FreeBSD.org.uk [194.242.157.42])
	by mx1.FreeBSD.org (Postfix) with ESMTP
	id 3480D43F75; Wed, 20 Aug 2003 16:14:58 -0700 (PDT)
	(envelope-from mark@grondar.org)
Received: from storm.FreeBSD.org.uk (Ugrondar@localhost [127.0.0.1])
	by storm.FreeBSD.org.uk (8.12.9/8.12.9) with ESMTP id h7KNEuHo026587;
	Thu, 21 Aug 2003 00:14:56 +0100 (BST)
	(envelope-from mark@grondar.org)
Received: (from Ugrondar@localhost)h7KNEtpb026586;
	Thu, 21 Aug 2003 00:14:55 +0100 (BST)
X-Authentication-Warning: storm.FreeBSD.org.uk: Ugrondar set sender to
	mark@grondar.org using -f
Received: from grondar.org (localhost [127.0.0.1])h7KN1WOI068795;
	Thu, 21 Aug 2003 00:01:32 +0100 (BST)
	(envelope-from mark@grondar.org)
From: Mark Murray <mark@grondar.org>
Message-Id: <200308202301.h7KN1WOI068795@grimreaper.grondar.org>
To: John Baldwin <jhb@FreeBSD.org>
In-Reply-To: Your message of "Wed, 20 Aug 2003 16:19:07 EDT."
             <XFMail.20030820161907.jhb@FreeBSD.org> 
Date: Thu, 21 Aug 2003 00:01:32 +0100
Sender: mark@grondar.org
X-Spam-Status: No, hits=1.2 required=5.0
	tests=EMAIL_ATTRIBUTION,FROM_NO_LOWER,IN_REP_TO
	version=2.55
X-Spam-Level: *
X-Spam-Checker-Version: SpamAssassin 2.55 (1.174.2.19-2003-05-19-exp)
cc: current@FreeBSD.org
Subject: Re: Current panic in pmap/VM 
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: Wed, 20 Aug 2003 23:14:59 -0000

John Baldwin writes:
> > pmap_ts_referenced()
> > vm_pageout_scan()
> > vm_pageout()
> > fork_exit()
> > fork_trampoline()
> > 
> > I'm happy to try patches if anyone has ideas.
> 
> Having the fault address as well as the source file/line of
> where the fault occurs could be helpful.

>From 2 panics, I have 2 addresses - 0xc02cbbab and 0xc02cfb9b (Custom
kernels, so I doubt those will help).

The source file is src/sys/i386/i386/pmap.c, and it is in the
pmap_ts_referenced() function (a short function) at about line 2895.

I'm suspecting that a lock is needed.

I'll need to put a serial debugger on to go any further. Does this
work, or will I be wasting effort? (Getting that cable in is going
to be a _pain_).

M
--
Mark Murray
iumop ap!sdn w,I idlaH