From owner-freebsd-current@FreeBSD.ORG  Mon Aug 23 20:43:59 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 C037916A4CE; Mon, 23 Aug 2004 20:43:59 +0000 (GMT)
Received: from freebee.digiware.nl (dsl390.iae.nl [212.61.63.138])
	by mx1.FreeBSD.org (Postfix) with ESMTP
	id 52FCA43D6A; Mon, 23 Aug 2004 20:43:58 +0000 (GMT)
	(envelope-from wjw@withagen.nl)
Received: from [212.61.27.71] (dual [212.61.27.71])
	by freebee.digiware.nl (8.12.10/8.12.10) with ESMTP id i7NKhrEg065954;
	Mon, 23 Aug 2004 22:43:53 +0200 (CEST)
	(envelope-from wjw@withagen.nl)
Message-ID: <412A5709.2070704@withagen.nl>
Date: Mon, 23 Aug 2004 22:43:53 +0200
From: Willem Jan Withagen <wjw@withagen.nl>
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US;
	rv:1.7.2) Gecko/20040804 Netscape/7.2 (ax)
X-Accept-Language: en-us, en
MIME-Version: 1.0
To: Julian Elischer <julian@elischer.org>
References: <20040822115345.Y94593@carver.gumbysoft.com>
	<20040823111304.GA767@zaphod.nitro.dk> <412A2CCF.4050809@elischer.org>
In-Reply-To: <412A2CCF.4050809@elischer.org>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
cc: freebsd-current@freebsd.org
cc: "Simon L. Nielsen" <simon@freebsd.org>
Subject: Re: PLEASE TEST: IPI deadlock avoidance patch
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, 23 Aug 2004 20:43:59 -0000

Julian Elischer wrote:

> Now to start work on the preemption hangs..
>

Well my dual AMD64 system seemed to be rather stable since I went with a 
Tyan board.
So I though lets be brave, and see how far we get with PREEMPTION....
I did not get anywhere.....

Right at boot time:
start_init: trying /sbin/init
panic: runq_choose: no proc on busy queue
cpuid = 0;
KDB: stack backtrace:
kdb_backtrace() at kdb_backtrace+0x37
panic() at panic+0x1e2
runq_choose() at runq_choose+0x6f
kseq_choose() at kseq_choose+0xc8
sched_choose() at sched_choose+0x5b
choosethread() at choosethread+0x47
sched_switch() at sched_switch+0x185
mi_switch() at mi_switch+0x28d
sleepq_switch() at sleepq_switch+0x123
sleepq_timedwait() at sleepq_timedwait+0xe
msleep() at msleep+0x425
g_io_schedule_down() at g_io_schedule_down+0x95
g_down_procbody() at g_down_procbody+0x40
fork_exit() at fork_exit+0xe9
fork_trampoline() at fork_trampoline+0xe

Dumping not possible since the system did not grow any kbd input.
Probably way to early to try this, but I was just  curious.

Question:
    Is this patch going into 6.0-CURRENT or in 5.3????

--WjW