Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751494AbVJLSZx (ORCPT ); Wed, 12 Oct 2005 14:25:53 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751490AbVJLSZx (ORCPT ); Wed, 12 Oct 2005 14:25:53 -0400 Received: from mustang.oldcity.dca.net ([216.158.38.3]:65509 "HELO mustang.oldcity.dca.net") by vger.kernel.org with SMTP id S1751494AbVJLSZw (ORCPT ); Wed, 12 Oct 2005 14:25:52 -0400 Subject: Re: 2.6.14-rc4-rt1 From: Lee Revell To: Mark Knecht Cc: Fernando Lopez-Lezcano , Ingo Molnar , linux-kernel@vger.kernel.org, Thomas Gleixner , Steven Rostedt , dwalker@mvista.com, david singleton In-Reply-To: <5bdc1c8b0510121100o11e0e28ft4b532ba43e170774@mail.gmail.com> References: <20051011111454.GA15504@elte.hu> <1129064151.5324.6.camel@cmn3.stanford.edu> <5bdc1c8b0510111408n4ef45eadv1e12ec4d1271d971@mail.gmail.com> <5bdc1c8b0510111413q7b1ea391n3bc27924d928b963@mail.gmail.com> <1129065696.4718.10.camel@mindpipe> <5bdc1c8b0510120937r45bbd26fr6f45b6e3a9895d3f@mail.gmail.com> <1129139304.10599.15.camel@mindpipe> <5bdc1c8b0510121100o11e0e28ft4b532ba43e170774@mail.gmail.com> Content-Type: text/plain Date: Wed, 12 Oct 2005 14:25:47 -0400 Message-Id: <1129141547.11297.4.camel@mindpipe> Mime-Version: 1.0 X-Mailer: Evolution 2.4.0 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1043 Lines: 23 On Wed, 2005-10-12 at 11:00 -0700, Mark Knecht wrote: > On 10/12/05, Lee Revell wrote: > > Sounds like an application bug (some JACK client doing something not RT > > safe). Can you reproduce the xruns if you just run jackd with no > > clients? > > I don't know. These xruns take hours to generate. I'd probably have to > dedicate a whole day of doing nothing on the machine to try, and then > if I didn't produce anything I'm not sure what it proves. If I do get > one then we get to see if there's data. A much easier solution is to recompile JACK with the --enable-preemption-check option. This activates the in-kernel debugging mechanism that causes a stack dump when an RT task schedules. It has been used to find tricky bugs in Hydrogen and Freqtweak already. Lee - 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/