Yesterday, while installing some more software, the fans on my ESXi system spun up to high, then all my sessions halted. That's never a good thing.
I took a look at what was on the physical screen of my system, and I got to learn about the joys of the PSOD. Initially, I thought the issue was bad memory, so I ran MemTest86 for a little over 20 hours. Nope. Not the problem.
A bit more searching revealed this little gem of a VMware knowledge base article.
Really, VMware? You're going to have a patch available for 5.0 and 5.1, but not 5.5? What the hell?!