large system date skew on RELENG_6 changes causes select() failures

[Stanislaw Halik]

Hello,

A while ago, by accident, I've changed the system date back to the '98
using date(1). To my astonishment, screen(1) barfed about EINVAL in
select() and died. Programs, including opera (native FreeBSD-6 binary)
kept spinning the CPU until I killed them.

I have no means for debugging it.

Is this somehow expected? If not (i.e. it's a bug), is it known?