From owner-freebsd-hackers@FreeBSD.ORG Wed Aug 1 03:14:29 2012 Return-Path: Delivered-To: freebsd-hackers@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 73C65106566B; Wed, 1 Aug 2012 03:14:29 +0000 (UTC) (envelope-from yuri@rawbw.com) Received: from shell0.rawbw.com (shell0.rawbw.com [198.144.192.45]) by mx1.freebsd.org (Postfix) with ESMTP id 5961F8FC08; Wed, 1 Aug 2012 03:14:29 +0000 (UTC) Received: from eagle.yuri.org (stunnel@localhost [127.0.0.1]) (authenticated bits=0) by shell0.rawbw.com (8.14.4/8.14.4) with ESMTP id q713ERRf048555; Tue, 31 Jul 2012 20:14:27 -0700 (PDT) (envelope-from yuri@rawbw.com) Message-ID: <50189F13.8020803@rawbw.com> Date: Tue, 31 Jul 2012 20:14:27 -0700 From: Yuri User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:13.0) Gecko/20120702 Thunderbird/13.0.1 MIME-Version: 1.0 To: Mark Saad References: <501871FD.601@rawbw.com> <50187853.7080206@freebsd.org> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: "freebsd-hackers@freebsd.org" Subject: Re: How to diagnose system freezes? X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 01 Aug 2012 03:14:29 -0000 On 07/31/2012 17:50, Mark Saad wrote: > Yuri > Install sysutils/mcelog and try running the example included . While not a complete definitative hardware test it can report other hardware issues that memtest86+ misses and it can be run on line in multiuser mode and via cron . Thanks for suggesting this. I have a question, however. Let's say 'mcelog --daemon' runs and encounters some MCE and logs it. Wouldn't this record be lost during the subsequent ungraceful (poweroff) reboot? Nonfatal MCEs, if any, will stay but what about the fatal one? Yuri