Re: 2.6.15-rt18, alsa sequencer, rosegarden -> alsa hangs

[Fernando Lopez-Lezcano <nando@ccrma.Stanford.EDU>]

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. 

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