[2.0.60] Crash when using --enable-lua-udp on port already in use and mod calls send_udp
Posted: Tue Jul 22, 2025 4:58 am
- What did you do?
Started Factorio with --enable-lua-udp and specified a port already occupied by another process. A mod then called send_udp on that same port. - What happened?
The game crashed immediately when the mod executed send_udp. - What did you expect to happen instead?
I expected an error or exception in the mod API, or for the packet to fail silently, rather than crashing the entire game. - How often does this happen?
Always reproducible when the same conditions are met.
Reproduction Steps:
Run nc -u -l 5000 (or similar) to occupy UDP port 5000.
Start Factorio with --enable-lua-udp=5000.
Use a mod that calls send_udp on port 5000.
Observe the crash.