From owner-freebsd-stable@FreeBSD.ORG  Mon Aug 23 06:45:18 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 C0E10106566C
	for <freebsd-stable@freebsd.org>; Mon, 23 Aug 2010 06:45:18 +0000 (UTC)
	(envelope-from avg@icyb.net.ua)
Received: from citadel.icyb.net.ua (citadel.icyb.net.ua [212.40.38.140])
	by mx1.freebsd.org (Postfix) with ESMTP id 179F18FC0C
	for <freebsd-stable@freebsd.org>; Mon, 23 Aug 2010 06:45:17 +0000 (UTC)
Received: from porto.topspin.kiev.ua (porto-e.starpoint.kiev.ua
	[212.40.38.100])
	by citadel.icyb.net.ua (8.8.8p3/ICyb-2.3exp) with ESMTP id JAA11721;
	Mon, 23 Aug 2010 09:44:40 +0300 (EEST)
	(envelope-from avg@icyb.net.ua)
Received: from localhost.topspin.kiev.ua ([127.0.0.1])
	by porto.topspin.kiev.ua with esmtp (Exim 4.34 (FreeBSD))
	id 1OnQlr-000DpO-Tc; Mon, 23 Aug 2010 09:44:39 +0300
Message-ID: <4C7218D6.6090408@icyb.net.ua>
Date: Mon, 23 Aug 2010 09:44:38 +0300
From: Andriy Gapon <avg@icyb.net.ua>
User-Agent: Mozilla/5.0 (X11; U; FreeBSD amd64; en-US;
	rv:1.9.2.8) Gecko/20100822 Lightning/1.0b2 Thunderbird/3.1.2
MIME-Version: 1.0
To: Dan Langille <dan@langille.org>
References: <4C71CC62.6060803@langille.org> <4C71D756.5080205@langille.org>
In-Reply-To: <4C71D756.5080205@langille.org>
X-Enigmail-Version: 1.1.2
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 7bit
Cc: freebsd-stable <freebsd-stable@freebsd.org>
Subject: Re: kernel MCA messages
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: Mon, 23 Aug 2010 06:45:18 -0000

on 23/08/2010 05:05 Dan Langille said the following:
> On 8/22/2010 9:18 PM, Dan Langille wrote:
>> What does this mean?
>>
>> kernel: MCA: Bank 4, Status 0x940c4001fe080813
>> kernel: MCA: Global Cap 0x0000000000000105, Status 0x0000000000000000
>> kernel: MCA: Vendor "AuthenticAMD", ID 0xf5a, APIC ID 0
>> kernel: MCA: CPU 0 COR BUSLG Source RD Memory
>> kernel: MCA: Address 0x7ff6b0
>>
>> FreeBSD 7.3-STABLE #1: Sun Aug 22 23:16:43
> 
> And another one:
> 
> kernel: MCA: Bank 4, Status 0x9459c0014a080813
> kernel: MCA: Global Cap 0x0000000000000105, Status 0x0000000000000000
> kernel: MCA: Vendor "AuthenticAMD", ID 0xf5a, APIC ID 0
> kernel: MCA: CPU 0 COR BUSLG Source RD Memory
> kernel: MCA: Address 0x7ff670

I believe that you get correctable RAM ECC errors, but not entirely sure.
There is mcelog utility that decodes such messages into human-friendly descriptions.
The utility is available on Linux-based systems.
John Baldwin has a port of it to FreeBSD, but it seems to be WIP and is private
so far.  Wait and watch John posting decoded text in this thread :-)

-- 
Andriy Gapon