Don't forget the Segfault bug on the Intel Quark (which doesn't have killbits - oops) [1], or the stack pointer overflow bug that Matt Dillon found compiling DragonflyBSD [2], or the Barcelona "you weren't really using your TLB, were you?" cache coherency bug [3].
Microcode is also in multiple places - there's a flavor baked into your chip, flavors baked into your BIOS to boot on your CPU if its rev is lower, and flavors pushed into {Windows,Linux,...} that also flash if their revs are newer.
Microcode is also in multiple places - there's a flavor baked into your chip, flavors baked into your BIOS to boot on your CPU if its rev is lower, and flavors pushed into {Windows,Linux,...} that also flash if their revs are newer.
[1] - https://en.wikipedia.org/wiki/Intel_Quark#Segfault_bug
[2] - http://wiki.osdev.org/CPU_Bugs#DragonFly_BSD_Heavy_Load_Cras...
[3] - http://www.anandtech.com/show/2477/2