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Date: Wed, 16 Jun 2010 20:50:47 +0200
From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
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Subject: Re: [Xenomai-help] rt_task_sleep causing crashes on PowerPC
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To: Abhijit Majumdar <abhijit.majumdar@domain.hid>
Cc: xenomai@xenomai.org, Steve Deiters <SteveDeiters@domain.hid>

Abhijit Majumdar wrote:
> Hi Philippe
> 
> I have attached a standalone test program which crashes my system. It
> uses poxis skin to create a simple task which sleeps for 10 micro sec
> and wakes up and continues to do so until the user kills the process.
> 
> Interesting things note -- 
> 
> 	1. If I uncomment the printf statement at the beginning of the
> while loop the program does not crash any more.
> 	2. OR if I use rt_task_sleep instead of clock_nanosleep it does
> not crash.
> 
> I am using xenomai 2.5.2 and the arm platform has kernel 2.6.28.

That is a not vague. In any case, 10us on an ARM is much too short. As I
think I already told someone at pivotal systems, ARM latencies are
larger than 50 us, and most of the time larger than 100us. So, asking
for a 10us sleep is preposterous.

However, if you want your report to be useful:
- please try the latest version (that would be Xenomai 2.5.3)
- send us the full log of the serial console, not the part you think is
relevant (the error comes here while xnpod_schedule is trying to print a
message, the interesting part is not the failure of add_preempt_count,
but probably more the error message which xnpod_schedule wants to print).
- sens us your kernel configuration.

-- 
					    Gilles.