From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751907Ab3IPQp7 (ORCPT ); Mon, 16 Sep 2013 12:45:59 -0400 Received: from mx1.redhat.com ([209.132.183.28]:60728 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751592Ab3IPQp6 (ORCPT ); Mon, 16 Sep 2013 12:45:58 -0400 Date: Mon, 16 Sep 2013 12:45:26 -0400 From: Dave Jones To: Peter Zijlstra Cc: Ingo Molnar , Steven Rostedt , Linux Kernel , Frederic Weisbecker Subject: Re: trinity finds ftrace/perf bug. Film at 11. Message-ID: <20130916164526.GB17568@redhat.com> Mail-Followup-To: Dave Jones , Peter Zijlstra , Ingo Molnar , Steven Rostedt , Linux Kernel , Frederic Weisbecker References: <20130911135434.GA678@redhat.com> <20130912141913.2ffc7077@gandalf.local.home> <20130913105637.GM31370@twins.programming.kicks-ass.net> <20130913141638.GA6799@redhat.com> <20130916093719.GR21832@twins.programming.kicks-ass.net> <20130916102535.GA1071@gmail.com> <20130916104349.GC29018@twins.programming.kicks-ass.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20130916104349.GC29018@twins.programming.kicks-ass.net> 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 On Mon, Sep 16, 2013 at 12:43:49PM +0200, Peter Zijlstra wrote: > On Mon, Sep 16, 2013 at 12:25:35PM +0200, Ingo Molnar wrote: > > Also, Dave, do you run a single copy of Trinity, or multiple ones? Any > > special options for Peter to reproduce your crashes? > > Trinity seems to spawn a process for each cpu available. So I get to run > 24 copies -- I presume they're all seeded differently. They are. And I can trip up that bug with just a single instance of trinity. (I was running more processes than cpu count though, with -C32) Dave