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