From mboxrd@z Thu Jan  1 00:00:00 1970
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Date: Fri, 23 Feb 2007 15:21:38 +0100
From: Jan Kiszka <jan.kiszka@domain.hid>
MIME-Version: 1.0
Subject: Re: [Xenomai-core] latency hangs on AT91RM9200
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To: Steven Scholz <steven.scholz@domain.hid>
Cc: Xenomai-core@domain.hid

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Steven Scholz wrote:
> Gilles,
>=20
>>> Sure but I would still not expect the system to hang!
>>> As I said missing a deadline is bad but ok.
>>> But hanging the whole system is not quite ok.
>> I want this bug solved too, especially since I am not sure that we wil=
l
>> only see it with too short periods.
>=20
> Makes us two! ;-)
>=20
>> I would add the call to printascii(printk_buff) directly in vprintk, a=
nd
>> use printk. Note however that special care must be taken to avoid
>> recursion when calling printk inside schedule, because printk may use
>> schedule. Anyway, I think the tracer will give better results than a
>> simple backtrace.
> Ok. Thanks.
>=20
> So what exactly shell I do? I have never worked with "the tracer".
>=20

Start here: http://www.xenomai.org/index.php/I-pipe:Tracer

I haven't followed all details (while hacking on other bugs :)), but you
have two options to catch a trace: the one described on that page *if*
your board survives the crash, or via ipipe_trace_panic_freeze()
followed by ipipe_trace_panic_dump() (+ switching to sync printk mode
first).

I'm currently cooking a patch to include the IRQ and domain states in
the latter output (they are available via /proc/ipipe/trace/frozen alread=
y).

Jan


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