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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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