Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752875Ab3JYKTs (ORCPT ); Fri, 25 Oct 2013 06:19:48 -0400 Received: from mail-ea0-f173.google.com ([209.85.215.173]:54076 "EHLO mail-ea0-f173.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752016Ab3JYKTq (ORCPT ); Fri, 25 Oct 2013 06:19:46 -0400 Date: Fri, 25 Oct 2013 12:19:43 +0200 From: Ingo Molnar To: Steven Rostedt Cc: Vince Weaver , linux-kernel@vger.kernel.org, Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Dave Jones , Frederic Weisbecker Subject: Re: perf/ftrace lockup on 3.12-rc6 with trigger code Message-ID: <20131025101943.GA3481@gmail.com> References: <1382695687.12254.4.camel@pippen.local.home> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1382695687.12254.4.camel@pippen.local.home> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1148 Lines: 31 * Steven Rostedt wrote: > > Urgh, I had turned those on to try to debug something and forgot > > to disable. I feel like I saw this problem before I had those > > enabled so I guess I have to start from scratch fuzzing to see > > if I can get a more generally reproducible trace. Btw., even if various config options are enabled, we don't want the kernel to lock up. So it might not be _the_ bug you are looking, but it certainly looks like _a_ bug. > Looks like something is incorrectly enabling function tracer > within perf. Peter told me that there's some ref count bug that > may use data after being freed on exit. > > I tried the program that you attached in you previous email, and > was not able to hit the bug. Are you able to hit the bug with that > code each time? A full .config and a SHA1 of the tested tree would definitely be nice! Thanks, Ingo -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/