Re: [Alsa-devel] Re: 2.6.15-rt18, alsa sequencer, rosegarden -> alsa hangs

[Takashi Iwai <tiwai@suse.de>]

At Tue, 07 Mar 2006 22:53:55 -0800,
Fernando Lopez-Lezcano wrote:
> 
> On Tue, 2006-03-07 at 23:06 +0100, Ingo Molnar wrote:
> > * Fernando Lopez-Lezcano <nando@ccrma.Stanford.EDU> 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. 

That'll be helpful.  A deadlocked mutex could be easily found by a
backtrace. 


Takashi