From owner-freebsd-stable@FreeBSD.ORG  Thu Jan 14 12:23:09 2010
Return-Path: <owner-freebsd-stable@FreeBSD.ORG>
Delivered-To: freebsd-stable@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 85871106568F;
	Thu, 14 Jan 2010 12:23:09 +0000 (UTC)
	(envelope-from petefrench@ticketswitch.com)
Received: from constantine.ticketswitch.com (constantine.ticketswitch.com
	[IPv6:2002:57e0:1d4e:1::3])
	by mx1.freebsd.org (Postfix) with ESMTP id 4CA368FC18;
	Thu, 14 Jan 2010 12:23:09 +0000 (UTC)
Received: from dilbert.rattatosk ([10.64.50.6] helo=dilbert.ticketswitch.com)
	by constantine.ticketswitch.com with esmtps (TLSv1:AES256-SHA:256)
	(Exim 4.69 (FreeBSD)) (envelope-from <petefrench@ticketswitch.com>)
	id 1NVOj3-000BX7-U7; Thu, 14 Jan 2010 12:22:57 +0000
Received: from petefrench by dilbert.ticketswitch.com with local (Exim 4.71
	(FreeBSD)) (envelope-from <petefrench@ticketswitch.com>)
	id 1NVOj3-000BYo-TB; Thu, 14 Jan 2010 12:22:57 +0000
Date: Thu, 14 Jan 2010 12:22:57 +0000
Message-Id: <E1NVOj3-000BYo-TB@dilbert.ticketswitch.com>
To: attilio@freebsd.org, freebsd-stable@freebsd.org
In-Reply-To: <3bbf2fe11001130112l26f7370dr2e282455a934a0b@mail.gmail.com>
From: Pete French <petefrench@ticketswitch.com>
Cc: 
Subject: Re: [PATCH] Lockmgr deadlock on STABLE_8
X-BeenThere: freebsd-stable@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Production branch of FreeBSD source code <freebsd-stable.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-stable>, 
	<mailto:freebsd-stable-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-stable>
List-Post: <mailto:freebsd-stable@freebsd.org>
List-Help: <mailto:freebsd-stable-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-stable>,
	<mailto:freebsd-stable-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Thu, 14 Jan 2010 12:23:09 -0000

> http://www.freebsd.org/~attilio/lockmgr_fix8.diff
>
> I'm seeking for testers here.
> Any report would be very much appreciated.

I tested the patch on my machine which locks up, and I am afraid that it
still locks, even with the patch applied. The last things on the console
before the lock are.

1) A whole load of sshd errors for one of those flood attacks which try
multiple usersnames. This is not unusual, all my systems with an external
ssh port see this.

2) Four 'Watchdog timeout occurreed, resetting!" messages from if_bce.c.
These are new - without your patch I did not get these.

I have tried rnning this machine with WITNESS in the kernel, but it
will not deadlock then. Without WiTNESS it will lock up in about
twelve hours. I am going to try with just KDB and DDB to see if I can get
it into a state where we can get some useful information out of it.

I realsie, of course, that this might be utterly unrelated to the problem
your patch is trying to address!

cheers,

-pete.