I ran on the assumption that it is the random number generator failing only for the hash seeding code -- hence downplaying the problem. I have no idea which RNG the actual rand() function uses, but password/session key generation can be made reasonably secure even with a nonfunctional RNG.
To the OP: What sort of results do you get if you run perl -le 'print rand() for 1..10' on the faulty boards? If you run it twice, will the same sequence repeat? What about on the working boards?
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