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

[Ingo Molnar]

* Takashi Iwai <tiwai@xxxxxxx> wrote:

> > > 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.

furthermore, in the -rt kernel (if PREEMPT_RT and DEBUG_DEADLOCKS is 
enabled), all locks will also be printed, and their owners, and the site 
where they got acquired, etc. A deadlocked mutex/semaphore should in 
fact be detected by the kernel, if those options are enabled.

	Ingo
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