Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754765Ab2EXW5M (ORCPT ); Thu, 24 May 2012 18:57:12 -0400 Received: from mx1.redhat.com ([209.132.183.28]:58405 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752345Ab2EXW5J (ORCPT ); Thu, 24 May 2012 18:57:09 -0400 Date: Thu, 24 May 2012 18:57:03 -0400 From: Dave Jones To: Steven Rostedt Cc: Linux Kernel , Frederic Weisbecker , Ingo Molnar Subject: Re: tracing ring_buffer_resize oops. Message-ID: <20120524225703.GA31149@redhat.com> Mail-Followup-To: Dave Jones , Steven Rostedt , Linux Kernel , Frederic Weisbecker , Ingo Molnar References: <20120524160146.GA6226@redhat.com> <1337876398.13348.178.camel@gandalf.stny.rr.com> <20120524172223.GA10689@redhat.com> <1337880914.13348.189.camel@gandalf.stny.rr.com> <20120524184728.GA13201@redhat.com> <1337885672.13348.194.camel@gandalf.stny.rr.com> <20120524191147.GA13936@redhat.com> <1337887495.13348.195.camel@gandalf.stny.rr.com> <20120524200541.GA6552@redhat.com> <1337899781.13348.208.camel@gandalf.stny.rr.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1337899781.13348.208.camel@gandalf.stny.rr.com> 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: 1573 Lines: 48 On Thu, May 24, 2012 at 06:49:41PM -0400, Steven Rostedt wrote: > On Thu, 2012-05-24 at 16:05 -0400, Dave Jones wrote: > > On Thu, May 24, 2012 at 03:24:55PM -0400, Steven Rostedt wrote: > > > On Thu, 2012-05-24 at 15:11 -0400, Dave Jones wrote: > > > > > > > > Also, how reproducible is it? When it triggered for me, it was constant. > > > > > Every boot and test failed. But after I did the make mrproper, I have > > > > > not been able to trigger it again. This is why I put it down as a bad > > > > > build. > > > > > > > > happens every time for me so far. > > > > > > Did you also do a make mrproper and try again? > > > > ok, that's nasty. Works fine after a make clean. > > > > Hmm, I did two make mrproper builds and they both failed. So this isn't > a build issue. Must just be some nasty race. I'm still leaning that this > has to do with the breakpoint function tracing updates. > > Looking deeper into it. > > -- Steve Possibly unrelated, but I found that it only worked once per boot. Is that expected ? echo irqsoff > current_tracer echo latency-format > trace_options echo 0 > tracing_max_latency echo 1 > tracing_on blah echo 0 > tracing_on cat trace showed me a trace as I expected repeating the same commands then got me an empty trace. what gives ? Dave -- 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/