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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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