This is a simple reproduction of CVE-2018-4407, which allows you to crash macOS and iOS devices with OSes from before late 2018.
To use the program, replace sourceStr and destStr in send_badopt.go with your IP address and the victim's IP address, respectively. After running send_badopt.go for a few seconds, the victim's machine should crash.
See the original writeup. Note that this writeup did not include the PoC script, so I had to derive a viable exploit myself.