[Xenomai-help] Re: A fairly small rtnet/Xenomai application that freezes the PC

[Jan Kiszka <jan.kiszka@domain.hid>]

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M. Koehrer wrote:
> Hi Jan and Gilles,
> 
> after a long debug-reboot-try-again-session I was able to reduce the problem I had
> to a very short application that leads to a complete system freeze on a 2.6.19.1 kernel.
> As with my PC I am not able to run the NMI stuff within Xenomai, I forward the application to you
> and the list. Perhaps somebody can try out the enclosed application with the latest Xenomai version
> on 2.6.19.1.

Thanks for the test case, I will give this a try ASAP.

> Please adjust the IP settings in the C file and in the xenorun script to your setup.
> It is sufficient to send out UDP frames, if the remote device does not answer this does not hurt.
> However the remote device should listen on a specified port to avoid ICMP complains about
> no-opened UDP ports...
> Using Ethereal I monitored the traffic.
> Here is the summary of it:
> ARP request/response (from the xenorun script)
> ARP request/response (from the applicaion)
> UDP message to port 18765 (no answer)
> 2 seconds later: UDP message to port 18765 (no answer)
> 2+5=7 seconds later: ARP request/response (from the application)
> 2 seconds later: UDP message to port 18765
> Here the system freezes. I do not see the message "Step A".

Could you set me the Ethereal dump for reference? Just in case the test
does not kick immediately for me and I need to check the event flow.

> 
> One important piece is the system() call out of the realtime application to do a rtroute.
> When I remove this call, there is no error...
> 
> 
> I am using Xenomai SVN #1969 and the included 2.6.19.1 patch. Pentium 4 UP.

Do you have a different (slower) execution platform at hand to check if
the CPU speed as influence on the lock-up? I hope it is not the case -
makes tracking easier. But it wouldn't be the first time.

> 
> Any feedback on this is highly welcome!
> 

You will get it.

Thanks again,
Jan


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