From owner-freebsd-hackers@FreeBSD.ORG Wed Dec 27 20:40:27 2006 Return-Path: X-Original-To: FreeBSD-Hackers@freebsd.org Delivered-To: FreeBSD-Hackers@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id 2E79816A492 for ; Wed, 27 Dec 2006 20:40:27 +0000 (UTC) (envelope-from mwm-keyword-freebsdhackers2.e313df@mired.org) Received: from mired.org (vpn.mired.org [66.92.153.74]) by mx1.freebsd.org (Postfix) with SMTP id C96ED13C475 for ; Wed, 27 Dec 2006 20:40:26 +0000 (UTC) (envelope-from mwm-keyword-freebsdhackers2.e313df@mired.org) Received: (qmail 76064 invoked by uid 1001); 27 Dec 2006 20:14:13 -0000 Received: by bhuda.mired.org (tmda-sendmail, from uid 1001); Wed, 27 Dec 2006 15:14:12 -0500 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Message-ID: <17810.54292.139339.466850@bhuda.mired.org> Date: Wed, 27 Dec 2006 15:14:12 -0500 To: Jan Knepper In-Reply-To: <4592690B.7080800@digitaldaemon.com> References: <45918F6E.90006@digitaldaemon.com> <004c01c7293b$d5e03b40$6500a8c0@laptopt> <4591CB3C.1060902@digitaldaemon.com> <200612261808.08984.mario@schmut.com> <4592690B.7080800@digitaldaemon.com> X-Mailer: VM 7.17 under 21.4 (patch 19) "Constant Variable" XEmacs Lucid X-Primary-Address: mwm@mired.org X-face: "5Mnwy%?j>IIV\)A=):rjWL~NB2aH[}Yq8Z=u~vJ`"(,&SiLvbbz2W`; h9L,Yg`+vb1>RG% *h+%X^n0EZd>TM8_IB;a8F?(Fb"lw'IgCoyM.[Lg#r\ X-Delivery-Agent: TMDA/1.1.5 (Fettercairn) From: Mike Meyer Cc: freebsd-isp@freebsd.org, Tim McCullagh , Mario Theodoridis , FreeBSD Hackers Subject: Re: 6.1-RELEASE / 6.2 Kernel Crash... 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, 27 Dec 2006 20:40:27 -0000 In <4592690B.7080800@digitaldaemon.com>, Jan Knepper typed: > FreeBSD 5.x branch run on that machine for almost 2 years without a > problem and magically the same time period in *hours* that I upgrade the > machine I get hardware problems too? Not an impossible coincidence, but > not very likely... Or it could be that you have a hardware problem in hardware that wasn't used by 5.x but is by 6.x. I had an 11/750 that ran BSD 4.2 for years with no problems. When I tried to upgrade it to BSD 4.3, it would reliably panic in namei during the boot process. We had about a dozen 750s, and this was our test machine - so none of them were going to be upgraded until this got fixed, deadline or no. Stepping through namei in the debugger showed that one of the instructions in the function prelude was changing a high bit in a register it wasn't supposed to touch at all. In 4.2, the register was unused, because namei got passed a handful of arguments. In 4.3, it got passed a pointer to a struct with some of that information in it, and the pointer wound up in said register. Dereferencing the pointer caused the panic. A motherboard replacement solved the problem. http://www.mired.org/consulting.html Independent Network/Unix/Perforce consultant, email for more information.