These are RAM tests mentioned in http://trofi.github.io/posts/209-tracking-down-mysterious-memory-corruption.html.

Source files contain example build command and output in case of found unexpected bit flips.

test-memmove-xmm-unaligned.cc is probably most complete and most commented final result.

WARNINGs:

• Tests don't handle errors nicely (like mlock() calls) to allow being ran as root and as user.
• Tests intentionally try to eat all you RAM chunk by chunk. Make sure you have read the source before running it.

Good luck!