How to stop a running memtester (without risking to have to reboot)?

*Extremely "noob" question:* I have a running sudo memtester ... on an Ubuntu 22.04 machine, but I gave it too much memory to test and it's taking [too much time](https://unix.stackexchange.com/q/789492/515980) (I see it running and updating, I made sure the RAM given to test was less than the free one). I'd like to stop it. I was thinking of trying with a simple Ctrl-c, but I wonder if that would cause some sort of lock-up, forcing me to reboot. Unfortunately the [man pages](https://man.archlinux.org/man/memtester.8.en) don't say anything about how to stop it.