From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Sat, 16 Mar 2002 09:43:56 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Sat, 16 Mar 2002 09:43:46 -0500 Received: from [63.204.6.12] ([63.204.6.12]:21444 "EHLO mail.somanetworks.com") by vger.kernel.org with ESMTP id ; Sat, 16 Mar 2002 09:43:34 -0500 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Message-ID: <15507.22980.217699.244120@somanetworks.com> Date: Sat, 16 Mar 2002 09:42:12 -0500 From: "Georg Nikodym" To: linux-kernel@vger.kernel.org Subject: MCE hangs on 2.4.19-pre3-rmap12g X-Mailer: VM 7.00 under 21.5 (beta4) "bamboo" XEmacs Lucid Reply-To: georgn@somanetworks.com Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org In 2.4.19-pre3, Marcelo added CONFIG_X86_MCE (Machine Check Exception). I'm running from Rik's bk available -rmap12g tree. I've tried enabling this option on both a T20 (IBM) and an i8k (Dell). (I became interested in the option when one of them started having flakiness which I briefly thought might be heat related). Both laptops hang very early in the boot process after emitting the message: Intel machine check architecture supported Kind of a drag since the keyboard isn't alive yet, so power cycling is your only option at this point. I'm not particularly concerned except that the help for this option ends with the sentences: Similarly, if MCE is built in and creates a problem on some new non-standard machine, you can boot with "nomce" to disable it. I think that "creates a problem" understates the observed "prevents your machine from booting". MCE support simply ignores non-MCE processors like the 386 and 486, so nearly everyone can say Y here. This reads like an encouragement when there should really be a warning. Here's the cpuinfo if each machine. Perhaps one of the x86 cognoscenti can tell me that I'm a dolt, that the flags: like clearly indicates that CONFIG_X86_MCE can never work. Thinkpad T20: (lou) 1001$ cat /proc/cpuinfo processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 8 model name : Pentium III (Coppermine) stepping : 3 cpu MHz : 746.766 cache size : 256 KB fdiv_bug : no hlt_bug : no f00f_bug : no coma_bug : no fpu : yes fpu_exception : yes cpuid level : 2 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 sep mtrr pge mca cmov pat pse36 mmx fxsr sse bogomips : 1490.94 Dell Inspiron 8000: (keller) 1001$ cat /proc/cpuinfo processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 8 model name : Pentium III (Coppermine) stepping : 10 cpu MHz : 996.692 cache size : 256 KB fdiv_bug : no hlt_bug : no f00f_bug : no coma_bug : no fpu : yes fpu_exception : yes cpuid level : 2 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 sep mtrr pge mca cmov pat pse36 mmx fxsr sse bogomips : 1985.74