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Date: Sun, 09 Apr 2006 17:07:41 +0200
From: Jan Kiszka <jan.kiszka@domain.hid>
MIME-Version: 1.0
Subject: Re: [Xenomai-core] latency -t 1 crashes on SMP.
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To: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
Cc: xenomai@xenomai.org

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Gilles Chanteperdrix wrote:
> I tried latency -t 1 on an SMP machines, and observed a very
> reproducible crash. Most of the time, the machine locks up
> completely. The rest of the time, I get :
>=20
> Xenomai: suspending kernel thread e7559044 ('timerbench') at 0xb01051f2=
 after ex
> ception #14
>=20
> And the system remains runnable, but 0xb01051f2 is not a valid kernel
> module text address.
>=20
> The lock up does not seem to be detected by any Xenomai or Linux
> debug or watchdog. Only enabling the NMI watchdog seems to
> systematically produce the exception 14 instead of the lockup.
>=20
> I ve tried to put a printk at the beginning of timer_task_proc outer
> loop. It get printed once when getting the exception 14, and twice when=

> getting the lock up.
>=20
> Any idea where to look ?
>=20

Two proposals to collect information:

o give KGDB a try
o instrument the xenomai exception handler with an ipipe_trace_freeze()
  (something which should be merged into SVN later)

Jan


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