AMD's random number generator can't generate a 0?
(news.ycombinator.com)
A user investigating AMD's hardware random number generator claims it never produces a zero value across millions of samples, a potential flaw that could undermine cryptographic operations relying on true randomness. AMD has acknowledged and escalated the report internally, but no fix or explanation has been issued yet, leaving questions about the reliability of hardware RNGs used in security-critical systems.