From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262873AbVGHUtD (ORCPT ); Fri, 8 Jul 2005 16:49:03 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261421AbVGHUrS (ORCPT ); Fri, 8 Jul 2005 16:47:18 -0400 Received: from mail.metronet.co.uk ([213.162.97.75]:7831 "EHLO mail.metronet.co.uk") by vger.kernel.org with ESMTP id S262873AbVGHUo7 (ORCPT ); Fri, 8 Jul 2005 16:44:59 -0400 From: Alistair John Strachan To: Ingo Molnar Subject: Re: Realtime Preemption, 2.6.12, Beginners Guide? Date: Fri, 8 Jul 2005 21:45:08 +0100 User-Agent: KMail/1.8.1 Cc: linux-kernel@vger.kernel.org References: <200507061257.36738.s0348365@sms.ed.ac.uk> <200507081938.27815.s0348365@sms.ed.ac.uk> <20050708194827.GA22536@elte.hu> In-Reply-To: <20050708194827.GA22536@elte.hu> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200507082145.08877.s0348365@sms.ed.ac.uk> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Friday 08 Jul 2005 20:48, Ingo Molnar wrote: > * Alistair John Strachan wrote: > > Unfortunately I see nothing like this when the machine crashes. Find > > attached my config, which has CONFIG_4KSTACKS and the options you > > specified. Are you sure this is sufficient to enable it? > > i have booted your .config, and stack overflow debugging is active and > working. So it probably wasnt a straight (detectable) stack recursion / > stack footprint issue. > Okay, I disabled IO-APIC and Local APIC, recompiled with (an otherwise identical) config. Got this (slightly better) oops. Figured out how to use my camera :-) http://devzero.co.uk/~alistair/oops6.jpeg Onto your stack-footprint metric. I don't know what the number means, but at a guess it's the size of the stack. Unfortunately, if this is the case, it's unlikely to be an overflow causing the crash. Here's a grep of dmesg just before the crash. [root] 21:39 [~] dmesg | grep new\ stack | new stack-footprint maximum: swapper/1, 1760 bytes. | new stack-footprint maximum: mount/471, 1716 bytes. | new stack-footprint maximum: cupsd/2623, 1564 bytes. | new stack-footprint maximum: kdm_greet/2845, 1528 bytes. | new stack-footprint maximum: krootimage/2846, 1204 bytes. | new stack-footprint maximum: konqueror/2938, 836 bytes. The complete traces are a bit long to include here, but I've uploaded the entire dmesg: http://devzero.co.uk/~alistair/dmesg.gz -- Cheers, Alistair. personal: alistair()devzero!co!uk university: s0348365()sms!ed!ac!uk student: CS/CSim Undergraduate contact: 1F2 55 South Clerk Street, Edinburgh. EH8 9PP.