Maybe this functionality was replaced by the next thing?

Automatic root filesystem soft-reboot: systemctl automatically reboots into a new root filesystem located at /run/nextroot/.

I didn’t try yet: https://www.cmcrossroads.com/article/gnu-make-escaping-walk-wild-side

colon := :
$(colon) := :
url := https$(:)//something

syscall -> asm -> page_fault

This a native machine code execution that crashed in your system. Could be an instruction that your CPU doesn’t understand (because the instruction is newer than your CPU, example: AVX512), or because your hardware returns an error when this instruction is executed (RAM issues?). Too difficult for me to understand this ASM crash.