From mboxrd@z Thu Jan  1 00:00:00 1970
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Date: Wed, 11 Jul 2007 09:32:55 +0200
From: Jan Kiszka <jan.kiszka@domain.hid>
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Subject: Re: [Xenomai-help] Sporadic PC freeze after rt_task_start
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To: "M. Koehrer" <mathias_koehrer@domain.hid>
Cc: xenomai@xenomai.org

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M. Koehrer wrote:
> Hi Jan,
>=20
> as I mentioned in my first mail on this topic, I have extracted this ex=
ample from a huge
> real time application where the system sporadically freezes.
> What I have found out there was, that the system freeze happened always=
 when trying
> to start a thread (in the original application, the tasks run fairly lo=
ng).

OK, so it's one of rt_task_create (unlikely), rt_task_start, usleep, or
some early code in the task function itself. Still, a lot of "or"...

Again, please consider my further debugging suggestions.

> I think it has to do with rt_task_start() followed by usleep() and the =
non-realtime stuff running
> on CPU 0 and the realtime stuff running on CPU 1.
> I never saw that issue on a single core CPU (even if the same SMP kerne=
l was used).

Yeah, it must be a nice race that requires real parallelism.

Jan


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