From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752774Ab0CDNyM (ORCPT ); Thu, 4 Mar 2010 08:54:12 -0500 Received: from hrndva-omtalb.mail.rr.com ([71.74.56.123]:59768 "EHLO hrndva-omtalb.mail.rr.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751555Ab0CDNyK (ORCPT ); Thu, 4 Mar 2010 08:54:10 -0500 X-Authority-Analysis: v=1.0 c=1 a=u-VO3dv88eYA:10 a=7U3hwN5JcxgA:10 a=Vqlk9IDV8gZJmW6E3goA:9 a=rrc0cJSkexMvhqlbvzLsyC7rO7QA:4 X-Cloudmark-Score: 0 X-Originating-IP: 74.67.89.75 Subject: Re: 2.6.33: ftrace triggers soft lockup From: Steven Rostedt Reply-To: rostedt@goodmis.org To: =?ISO-8859-1?Q?Am=E9rico?= Wang Cc: LKML , Frederic Weisbecker , Ingo Molnar In-Reply-To: <2375c9f91003022204p5bdab1fdj3b3500998575fc28@mail.gmail.com> References: <2375c9f91003022204p5bdab1fdj3b3500998575fc28@mail.gmail.com> Content-Type: text/plain; charset="ISO-8859-15" Organization: Kihon Technologies Inc. Date: Thu, 04 Mar 2010 08:54:07 -0500 Message-ID: <1267710847.10871.102.camel@gandalf.stny.rr.com> Mime-Version: 1.0 X-Mailer: Evolution 2.28.2 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 2010-03-03 at 14:04 +0800, Américo Wang wrote: > I am not sure if this is ftrace's fault, but it is ftrace who triggers > the soft lockup. On my machine, it is pretty easy, just run: > > echo function_graph > current_tracer > > I found this when 2.6.33-rc7, but forgot to report here. I just tried > today's > Linus tree, it still has this problem. So this is not present in 2.6.33-rc6? If you know approximately when it appeared, would you be able to do a git bisect on it? Thanks, -- Steve