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Date: Wed, 11 Jul 2007 14:45:54 +0200 (CEST)
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Subject: Re: [Xenomai-help] Sporadic PC freeze after rt_task_start
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To: jan.kiszka@domain.hid, mathias_koehrer@domain.hid
Cc: xenomai@xenomai.org

Hi Jan,

I tried with Xenomai 2.3.2 and (still) the kernel 2.6.20.4 - same configura=
tion as before.
I used the adeos patch for 2.6.20 that is part of Xenomai 2.3.2
Same effect.
The system freezes...

Regards

Mathias

> M. Koehrer wrote:
> > Hi Jan,
> >=20
> > as I mentioned in my first mail on this topic, I have extracted this
> example 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
> long).
>=20
> 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"...
>=20
> Again, please consider my further debugging suggestions.
>=20
> > 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).
>=20
> Yeah, it must be a nice race that requires real parallelism.
>=20
> Jan
>=20
>=20


--=20
Mathias Koehrer
mathias_koehrer@domain.hid


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