From owner-freebsd-current@FreeBSD.ORG  Mon Jul 12 20:56:16 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 7709816A4CE; Mon, 12 Jul 2004 20:56:16 +0000 (GMT)
Received: from av6-1-sn3.vrr.skanova.net (av6-1-sn3.vrr.skanova.net
	[81.228.9.179])	by mx1.FreeBSD.org (Postfix) with ESMTP
	id 3B26443D3F; Mon, 12 Jul 2004 20:56:16 +0000 (GMT)
	(envelope-from manlix@demonized.net)
Received: by av6-1-sn3.vrr.skanova.net (Postfix, from userid 502)
	id 40BB737F53; Mon, 12 Jul 2004 22:56:15 +0200 (CEST)
Received: from smtp3-1-sn3.vrr.skanova.net (smtp3-1-sn3.vrr.skanova.net
	[81.228.9.101])	by av6-1-sn3.vrr.skanova.net (Postfix) with ESMTP
	id 31BE237EBD; Mon, 12 Jul 2004 22:56:15 +0200 (CEST)
Received: from fisk.demonized.net (h144n2fls33o834.telia.com [213.66.186.144])
	by smtp3-1-sn3.vrr.skanova.net (Postfix) with ESMTP
	id 6CE3F37E4C; Mon, 12 Jul 2004 22:56:14 +0200 (CEST)
Received: from beard.demonized.net (beard.demonized.net [192.168.0.2])
	by fisk.demonized.net (Postfix) with SMTP id A786C60EC;
	Mon, 12 Jul 2004 22:56:22 +0200 (CEST)
Date: Mon, 12 Jul 2004 22:56:12 +0200
From: Johan Pettersson <manlix@demonized.net>
To: Robert Watson <rwatson@freebsd.org>
Message-Id: <20040712225612.3ba37729.manlix@demonized.net>
In-Reply-To: <Pine.NEB.3.96L.1040712163724.52015B-100000@fledge.watson.org>
References: <20040712223557.095e8b1c.manlix@demonized.net>
	<Pine.NEB.3.96L.1040712163724.52015B-100000@fledge.watson.org>
X-Mailer: Sylpheed version 0.9.12 (GTK+ 1.2.10; i386-portbld-freebsd5.2)
Mime-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
cc: freebsd-current@freebsd.org
cc: avleeuwen@piwebs.com
cc: skywizard@mybsd.org.my
Subject: Re: Native preemption is the culprit [was Re: today's CURRENT
 lockups]
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: Mon, 12 Jul 2004 20:56:16 -0000

> It's not currently clear what the cause is -- reports suggest that
> it's an existing bug that's getting triggered by preemption, although
> I wouldn't rule out a bug in the preemption implementation itself. 
> I'm currently setting up a box with NMI to see if I can get some more
> useful information, as serial break isn't cutting it (suggesting a
> leaked spin lock or critical section).  I don't have an ETA, but I'm
> guessing that we'll have some sort of resolution in the next day or
> two.  If not, I guess we back out the change, or disable PREEMPTION by
> default.
> 
> Robert N M Watson             FreeBSD Core Team, TrustedBSD Projects
> robert@fledge.watson.org      Principal Research Scientist, McAfee
> Research
> 

Okey... Im going to build a kernel with #define PREEMPTION disabled now.
Its too annoying to get lock-ups all the time. :) Shout when you have
some code to be tested.