Path: utzoo!mnetor!uunet!seismo!sundc!pitstop!sun!amdcad!ames!ucbcad!ucbvax!UC.MSC.UMN.EDU!slevy
From: slevy@UC.MSC.UMN.EDU (Stuart Levy)
Newsgroups: comp.protocols.tcp-ip
Subject: Re: WARNING: TOD clock not initialized -- CHECK AND RESET THE DATE!
Message-ID: <8801032315.AA02890@uc.msc.umn.edu>
Date: 3 Jan 88 23:15:17 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The ARPA Internet
Lines: 5

It wasn't the leap second, just the fact that 1988 is a leap year.
SUN-3's contain a date-and-time clock chip, and there's kernel code
to translate UNIX time <=> the clock chip's format.  In leap years,
the code broke and loaded garbage into the chip.  Later, on reading it
back, it noticed that the chip contained an invalid date.