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

* Takashi Iwai <tiwai@suse.de> 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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