Building Facebook's Service Encryption Infastructure
> After several days, we finally narrowed down the issue to a bad Advanced Vector Extensions (AVX) instruction on a single CPU in our fleet<p>This isn't even the first time I've heard of an issue at FB being caused by a single bad CPU instruction. Working at a scale where "Problem X is a one-in-a-million edge case" and "Problem X happens several times per day" are synonymous is weird...