[Xenomai-help] rtnet / Xenomai: Kernel 2.6.19.1 hangs, 2.6.17.7 works

["M. Koehrer" <mathias_koehrer@domain.hid>]

Hi rtnet and Xenomai users,

I have an issue with the latest Xenomai (svn #1962) and rtnet (svn #1095) versions
using kernel 2.6.19.1. The very same application worked fine on 2.6.17.7 (same Xenomai/rtnet).
My application does the following steps in user space:
1) I open one UDP socket to an embedded device.
2) The timeout of the socket is set to 5 seconds.
3) I send out one UDP message A via rt_dev_send() to the device.
4) Then I wait for the response for A in rt_dev_recv()
5) Directly after the return of rt_dev_recv() I send  message B via rt_dev_send()
6) Then I wait for the response for B in rt_dev_recv()
Here my PC freezes. I am no longer able to access it, I have to press the reset button on the PC.

I have connected the PC and the embedded device with a hub. This allows me to monitor the network
traffic using a second PC. Ethereal shows me, that message B is sent to the embedded device
and the response of B is sent back to the PC.

Whenever I place a printf() directly after the rt_dev_recv() statements to see what happens,
everything works fine and the PC no longer freezes.

As mentioned above, when I use the very same application with 2.6.17.7 (same Xenomai, rtnet version)
everything is perfect!
I have a Pentium 4 Dual core, SMP enabled.

Any idea on this strange behaviour?

Thanks for any feedback

Regards

Mathias

-- 
Mathias Koehrer
mathias_koehrer@domain.hid


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