From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262657AbVGMOqp (ORCPT ); Wed, 13 Jul 2005 10:46:45 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262659AbVGMOqp (ORCPT ); Wed, 13 Jul 2005 10:46:45 -0400 Received: from mx2.elte.hu ([157.181.151.9]:51163 "EHLO mx2.elte.hu") by vger.kernel.org with ESMTP id S262657AbVGMOqo (ORCPT ); Wed, 13 Jul 2005 10:46:44 -0400 Date: Wed, 13 Jul 2005 16:45:51 +0200 From: Ingo Molnar To: Alistair John Strachan Cc: linux-kernel@vger.kernel.org Subject: Re: Realtime Preemption, 2.6.12, Beginners Guide? Message-ID: <20050713144551.GA26067@elte.hu> References: <200507061257.36738.s0348365@sms.ed.ac.uk> <200507111538.22551.s0348365@sms.ed.ac.uk> <20050711144328.GA18244@elte.hu> <200507111650.33187.s0348365@sms.ed.ac.uk> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <200507111650.33187.s0348365@sms.ed.ac.uk> User-Agent: Mutt/1.4.2.1i X-ELTE-SpamVersion: MailScanner 4.31.6-itk1 (ELTE 1.2) SpamAssassin 2.63 ClamAV 0.73 X-ELTE-VirusStatus: clean X-ELTE-SpamCheck: no X-ELTE-SpamCheck-Details: score=-4.9, required 5.9, autolearn=not spam, BAYES_00 -4.90 X-ELTE-SpamLevel: X-ELTE-SpamScore: -4 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org * Alistair John Strachan wrote: > Ours links to a company server with a consumer grade 1Mbit ADSL > connection, and transferring just about anything at 110K/s causes the > kernel to crash within about 10 seconds. > > I wish you the best of luck with getting this going, and I apologise > in advance for the poor instructions. it worked upon the first try, and indeed my testbox crashed within 10 seconds: BUG: Unable to handle kernel NULL pointer dereference BUG: Unable to handle kernel NULL pointer dereference at virtual address 00000006 printing eip: 00000006 *pde = 00000000 Oops: 0000 [#1] PREEMPT Modules linked in: CPU: 0 EIP: 0060:[<00000006>] Not tainted VLI EFLAGS: 00010286 (2.6.12-RT-V0.7.51-30-debug) EIP is at 0x6 eax: c057fef8 ebx: c0614340 ecx: c04490b8 edx: 00000001 esi: c057ff34 edi: c0135d52 ebp: c057ff54 esp: c057ff3c ds: 007b es: 007b ss: 0068 preempt: 20000002 it was enough to "ssh 10.0.0.1" from the client, and typing "yes" would trigger the crash very soon. thanks for the instructions - now i can start debugging this :-) Ingo