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    Subject[patch] Real-Time Preemption, -RT-2.6.10-rc2-mm1-V0.7.27-2

    * Ingo Molnar <mingo@elte.hu> wrote:

    > > Already testing with RT-0.7.26-5 now. No good. Same lockup behavior on
    > > alsa shutdown, altought not always, but very frequently. Nothing comes
    > > out via serial console. Not even SysRq is of any help, pretty hard
    > > these lockups are.
    >
    > i'm rebasing to -rc2-mm1 currently, it should be completed today and
    > we'll see whether those ALSA problems are upstream related.
    >
    > is it stable if you dont unload the ALSA modules?

    i just found a potential problem that could cause a near-lockup during
    module removal. This code in __module_put_and_exit() could loop for
    quite long time:

    while (current->lock_depth != -1)
    unlock_kernel();

    since for specifically ALSA's no-BKL purpose i've introduced the notion
    of ->lock_depth going below -1. So if we happen to put the module while
    ->lock_depth is -2, it could take quite some time for it to go down to
    zero again ... (and it could cause other problems as well)

    i fixed this in the -V0.7.27-2 release, freshly uploaded to the usual
    place:

    http://redhat.com/~mingo/realtime-preempt/

    do you still see lockups with this patch?

    Ingo
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