linux-kernel - Re: [PATCH -stable] ntp: Correct TAI offset during leap second

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Date:	Tue, 19 Jun 2012 12:57:47 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	John Stultz <johnstul@...ibm.com>
Cc:	Richard Cochran <richardcochran@...il.com>,
	Jonathan Nieder <jrnieder@...il.com>, stable@...r.kernel.org,
	Sasha Levin <levinsasha928@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Dave Jones <davej@...hat.com>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -stable]  ntp: Correct TAI offset during leap second

On Mon, 2012-06-18 at 11:20 -0700, John Stultz wrote:
> On 06/18/2012 06:55 AM, Ben Hutchings wrote:
[...]
> >>> John, is that bug present in 3.2.y and 3.0.y, too?  Any hints for
> >>> fixing it?
> >> It looks like incrementing the TAI offset was wrong even before
> >>
> >>     6b43ae8a ntp: Fix leap-second hrtimer livelock  v3.4-rc1~44^2~9
> >>
> >> The offset should change upon entering state OOP, so something like
> >> the following (untested) patch should fix it for 3.2.9.
> > [...]
> >
> > It looks like this patch just changes the offset reported by adjtimex()
> > during an inserted second; is that right?
> 
> Yep. It just makes sure the TAI offset is adjusted at the same point 
> that the leapsecond is inserted (as opposed to a second late).
> 
> >
> > Other than that, is 3.2.y likely to be OK?  Is there a good way to test
> > that in advance; does
> > <http://codemonkey.org.uk/2012/06/15/testing-leap-code/>  look
> > reasonable?
> Attached is a simple leap second test you can play with.

Thanks.  That also detects inconsistency on some runs, but I don't see
anything worse.  So I don't intend to apply any of the ntp fixes to
3.2.y.

Ben.

-- 
Ben Hutchings
If more than one person is responsible for a bug, no one is at fault.

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