The game is a 32 bits application and it likely ran out of memory. Could you check how much the game uses in the task manager of linux?
If you need more memory - we've made significant improvements and managed to increase the ceiling from 3GBs to 4GBs on the development branch. You can choose FAFDevelop as you host a game, instead of the usual FAF game type on the left.
Note: the development branch is in the middle of a development iteration, and therefore it may have bugs of its own. You can report those on Discord or in this topic:
https://forum.faforever.com/topic/5447/developers-iteration-i-of-2023/14