Coredump issue

Hi
We have two summer interns who are about to port a few of the packet drill test cases to our 5G system simulator, to make sure that it adheres to Linux TCP. 
It seems like we are getting core dump errors on both client and server side when running between two different PCs.

Do you have any idea what may be wrong ?

The PCs are Unbuntu 20.04 with uname -r: 5.15.0-67-generic

/Ingemar