From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751050AbWCHGyL (ORCPT ); Wed, 8 Mar 2006 01:54:11 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751742AbWCHGyL (ORCPT ); Wed, 8 Mar 2006 01:54:11 -0500 Received: from smtp1.Stanford.EDU ([171.67.16.123]:62927 "EHLO smtp1.Stanford.EDU") by vger.kernel.org with ESMTP id S1751050AbWCHGyJ (ORCPT ); Wed, 8 Mar 2006 01:54:09 -0500 Subject: Re: 2.6.15-rt18, alsa sequencer, rosegarden -> alsa hangs From: Fernando Lopez-Lezcano To: Ingo Molnar Cc: nando@ccrma.Stanford.EDU, linux-kernel@vger.kernel.org, alsa-devel@lists.sourceforge.net, cc@ccrma.Stanford.EDU In-Reply-To: <20060307220628.GA27536@elte.hu> References: <1141769000.5565.21.camel@cmn3.stanford.edu> <20060307220628.GA27536@elte.hu> Content-Type: text/plain Date: Tue, 07 Mar 2006 22:53:55 -0800 Message-Id: <1141800836.6150.3.camel@cmn3.stanford.edu> Mime-Version: 1.0 X-Mailer: Evolution 2.2.3 (2.2.3-2.fc4) Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 2006-03-07 at 23:06 +0100, Ingo Molnar wrote: > * Fernando Lopez-Lezcano wrote: > > > The symptoms are as follows: > > - start jack using qjackctl > > - start qsynth (gui front end for fluidsynth, a synth) > > - start rosegarden (midi sequencer and audio recorder) > > - load a midi file into rosegarden > > - midi file plays successfully > > - close rosegarden > > at this point one of the threads of rosegarden fails to exit and stays > > forever in the process list, in a ps axuw it shows as: > > > > nando 5484 0.0 0.0 0 0 pts/1 D 13:32 0:00 [rosegardenseque] > > > > Anything else that I try to stop that touches the alsa sequencer never > > dies (qjackctl, vkeybd, qsynth, etc). Anything I try to start that tries > > to use it does not start. This happened with two widely different > > could you get a tasklist-dump? It's either SysRq-T, or: > > echo t > /proc/sysrq-trigger > > that should dump all tasks and their backtraces - including the hung > rosegardensequencer task. I'll try to do that tomorrow. In the meanwhile I think this might be the same problem that was solved in -rt20? (building it as I type). I have been trying to catch up to the subset of lkml that I manage to read and found some reports that apparently point to similar problems with the alsa sequencer (Rui, in particular, and then Karsten's post in this thread). -- Fernando