From mboxrd@z Thu Jan 1 00:00:00 1970 From: m.luescher@vtxmail.ch Subject: Hard lockup with 2.6.24.7-rt26 on x86 Date: Mon, 2 Feb 2009 21:55:36 +0100 Message-ID: <37144.1233608136@vtxmail.ch> Reply-To: m.luescher@vtxmail.ch Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8BIT To: Return-path: Received: from smtp-02.datacomm.ch ([212.40.2.27]:49993 "EHLO smtp-02.datacomm.ch" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752951AbZBBVQe convert rfc822-to-8bit (ORCPT ); Mon, 2 Feb 2009 16:16:34 -0500 Received: from localhost (webmail-01.datacomm.ch [212.40.2.18]) by smtp-02.datacomm.ch (VTX Datacomm AG) with ESMTP id 05ED712020C for ; Mon, 2 Feb 2009 21:55:36 +0100 (CET) Sender: linux-rt-users-owner@vger.kernel.org List-ID: Dear Linux rt users On two different desktop PC (both Core 2 Duo) and on a notebook (Core Duo) the kernel (2.6.24.7-rt26, CONFIG_X86_32) locks up hard under a certain rt load. The failure can be reproduced reliably with the following command: sudo ./cyclictest -p99 -t10 -n -i250 During the test I made some additional observations: - The lockup is really hard: there is no output on a netconsole and even the magic sysrequest keys to reboot the system (Alt+SysRQ+b) do not work anymore. - with a lower realtime priority the system seems to run at least more stable (e.g. sudo ./cyclictest -p95 -t10 -n -i250) - with the vanilla 2.6.26.6-rt11 kernel I observed probably the same crash - the problem also appears on Ubuntu Hardy Heron with the latest official kernel (2.6.24.23.25 with rt21 patch) - the problem did not appear on Ubuntu Hardy Heron with older rt-kernel versions (also 2.6.24 but based on rt3 patch) So at the moment I am really clueless and I would be happy for any hint on how I can further debug this crash. Best regards Matthias