Emacs Core Dump
I know something hardware-related is probably going on with my RAM when Emacs dumps core randomly on me. It just happened. Every other time it has, there was a major hardware problem within months, usually weeks.
Seems like an annoying early warning system.
memtest86+ is available at boot on most popular distributions, and normally in the repositories. It's a very thorough RAM tester, however, it's a very slow process that takes forever!