linux-kernel - Re: Bug: Status/Summary of slashdot leap-second crash on new years 2008-2009

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Message-ID: <8752a8760901022237r75d408b3i74c703c8ac2d4597@mail.gmail.com>
Date:	Sat, 3 Jan 2009 06:37:38 +0000
From:	"Ben Goodger" <goodgerster@...il.com>
To:	"David Newall" <davidn@...idnewall.com>
Cc:	"Robert Hancock" <hancockr@...w.ca>, linux-kernel@...r.kernel.org,
	linasvepstas@...il.com, "Jeffrey J. Kosowsky" <jeff@...owsky.org>,
	MentalMooMan <slashdot@...eshallam.info>,
	"Travis Crump" <pretzalz@...hhouse.org>, burdell@...ntheinter.net
Subject: Re: Bug: Status/Summary of slashdot leap-second crash on new years 2008-2009

2009/1/3 David Newall <davidn@...idnewall.com>:
> Robert Hancock wrote:
>> Diego Calleja wrote:
>>> How could I create a test case that reproduces what ntp does? Just add
>>> a second?
>>
>> I'd think that setting the clock to just before midnight on Dec.31 and
>> using the adjtimex syscall to set the TIME_INS state on the clock,
>> then waiting until midnight rolls around would be a reasonable test..
>
> I don't understand this idea, nor the patch for the problem.  I don't
> see why adding a leap second would impact the kernel in any way.
> Shouldn't this be a simple zoneinfo change, whereby the last two seconds
> of the year (in each timezone) both map to 31dec2008 23:59:59?  That's
> the way the change has worked in the real world.  Why would ntp or the
> kernel be involved?

Actually, the change has worked in the real world with the
introduction of a new second named 23:59:60, or else ignoring the leap
second entirely and correcting the clock (or not) later...

-- 
Benjamin Goodger

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