Seeing why the game is frozen

Linux

In Terminal:

1. ps -ef | grep ClassiCube - to find PID / process ID of ClassiCube (first number in an output line)
2. sudo eu-stack -id -p [PID] - to print stacktrace for that process

Windows

1. Get and run process hacker from https://processhacker.sourceforge.io/, specifically
   1. Click Download Process Hacker button
   2. Download and extract the portable .zip file from the Binaries (Portable) section
   3. Run ProcessHacker.exe from x64 directory (or x86 if 32 bit operating system)
2. Double click the second / child ClassiCube.exe in processes list
3. Go to Threads tab
4. Double click first line in list to get the stacktrace

It should end up looking similar to this (when the game is frozen):