From owner-freebsd-current@FreeBSD.ORG  Tue Jun  3 09:24:42 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 08E5B37B401
	for <current@freebsd.org>; Tue,  3 Jun 2003 09:24:41 -0700 (PDT)
Received: from magic.adaptec.com (magic-mail.adaptec.com [208.236.45.100])
	by mx1.FreeBSD.org (Postfix) with ESMTP id 2551A43F85
	for <current@freebsd.org>; Tue,  3 Jun 2003 09:24:41 -0700 (PDT)
	(envelope-from scottl@freebsd.org)
Received: from redfish.adaptec.com (redfish.adaptec.com [162.62.50.11])
	by magic.adaptec.com (8.11.6/8.11.6) with ESMTP id h53GJcZ03210;
	Tue, 3 Jun 2003 09:19:38 -0700
Received: from freebsd.org (hollin.btc.adaptec.com [10.100.253.56])
	by redfish.adaptec.com (8.8.8p2+Sun/8.8.8) with ESMTP id JAA07477;
	Tue, 3 Jun 2003 09:24:40 -0700 (PDT)
Message-ID: <3EDCCB27.5020707@freebsd.org>
Date: Tue, 03 Jun 2003 10:21:59 -0600
From: Scott Long <scottl@freebsd.org>
User-Agent: Mozilla/5.0 (X11; U; FreeBSD i386; en-US; rv:1.3) Gecko/20030414
X-Accept-Language: en-us, en
MIME-Version: 1.0
To: Bryan Liesner <bleez@verizon.net>
References: <20030602230746.U69975-100000@mail.chesapeake.net>
	<20030603115912.Q648@gravy.homeunix.net>
In-Reply-To: <20030603115912.Q648@gravy.homeunix.net>
Content-Type: text/plain; charset=us-ascii; format=flowed
Content-Transfer-Encoding: 7bit
cc: Jeff Roberson <jroberson@chesapeake.net>
cc: current@freebsd.org
Subject: Re: umtx/libthr SMP fixes.
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, 03 Jun 2003 16:24:42 -0000

Bryan Liesner wrote:
> On Mon, 2 Jun 2003, Jeff Roberson wrote:
> 
> 
>>If you have had issues with libthr on SMP or umtx panics, the following
>>patch may solve these issues.
>>
>>http://www.chesapeake.net/~jroberson/umtxlocks.diff
>>
>>This patch fixes several race conditions and other issues with umtx.
> 
> 
> Actually, no it doesn't.  I was able to use kern_umtx v 1.3 only if I
> removed atapicam from my kernel config.  These patches (now
> committed?) panic the system whether I use atapicam or not.
> With kern_umtx v1.2 there is no panic at all, with or without
> atapicam.
> 
> Actually, I think it's cam in general that's causing the panic with
> these changes.
> 
> Please see kern/52718

I didn't see a backtrace in the PR.  Is there one that you can share 
with us?

Scott