memtest86 should be a boot option, runnable from grub.
NOTABUG Run /usr/sbin/memtest-setup and it will do so. We were not able to run this by default in %post because: 1) It wont work in anaconda. 2) Jeremy didn't want it to optionally run (only outside of anaconda) because that would be inconsistent. I'm sorry. At least the script provided in memtest86+ makes it easy to do it manually. It even removes itself from grub.conf when you uninstall or upgrade the version.
No problem. I didn't report the "bug" for me, I reported it for the users that don't know what memtest86 is. Yet.
*** Bug 227265 has been marked as a duplicate of this bug. ***