No one needs to hack your servers, weirdo. I occasionally play on your Railmania server, and I’ve already told you that you have a problem. This will be the last time I explain it to you. If you don’t get it, well, that’s your problem.

Enter one of these commands in your server console:

/locations

or

/players

These commands completely crash your server. This happens due to an internal cyclic error. Your engine is problematic. I’ve dealt with the same issue before. Run your servers on the IOQuake3 engine—this thing is already adapted for Linux, so you won’t need Wine or any of that. The crashes will stop.

There’s some idiot with an Italian flag and the name “ExcessivePlus” who always ruins my game on your server. Every time he joins, he uses the /locations command because he’s learned a few commands in his life and thinks he’s a hacker just because he can see someone’s real flag. There may be others like him. Switch your engine, and the problem will disappear.

I told you about the problematic Quake version, and then Superbad mentioned the same thing to you somewhere. If you’re complaining, at least read what people are telling you. Look up IOQuake3 and download it: https://ioquake3.org/.
If you have a Vulkan engine, then it is also not suitable for a server, it is only good for a client game.