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Comment by saagarjha | Hacker News Reader

Or break it, depending on how old it is:

  f0 0f c7 c8: lock cmpxchg8b eax

Does this still bug still bite anywhere? Embedded computing with Pentiums?

It's an invalid instruction, so a compiler wouldn't (shouldn't) ever generate it.

You can make gcc generate it, and versions of Linux without no-execute support will actually run it. Like so:

int main = 0xc8c70ff0;

Ah, but that's something you do on purpose. What I meant is that it's not a Meltdown-like problem.

I used a Pentium with that bug as a router up until 2009.

Yeah, I used to have a similar setup then. That was 10 years ago, though.