[tialaramex]

You can tell Linux that you don't want overcommit. You will probably discover that you're now even more miserable and change it back, but it's an option.

[wizzwizz4]

Whenever I switch off overcommitting, every program on my system (that I'm using) dies, one by one, over the course of 2–5 seconds, followed by Xorg. It's quite pretty.

[Shorel]

I did that and even with enormous amounts of free memory, Chrome and other Chromium browsers just die.

They require overcommit just to open an empty window.