Repeated TCP connection cause stack problems

Hi Genodians,

for our current project we would like to use the lwip stack. We discovered that repeated tcp connections cause a segfault or assert both under nova and linux.

Then we switched to the lxip stack which fares better but gets stuck after 340 tcp connections both under nova and linux.

I've uploaded a stress test run script named "tcp_stress_lwip" and "tcp_stress_lxip" respectively that shows this problem:

https://github.com/throwException/genode/commits/tcp_stress_test

Does anyone have any ideas on how to fix any of these problems?

(If the problems get fixed it might be a good idea to integrate these stress tests into automated regression tests.)

Kind regards Stefan