Re: 2.6.21.5 june 30th to july 1st date hang?

Dave Jones
2007-07-03T17:19:41Z

On Tue, Jul 03, 2007 at 11:36:42AM -0400, Fortier,Vincent [Montreal] wrote:
> > -----Message d'origine-----
> > De : linux-kernel-owner@vger.kernel.org
> > [mailto:linux-kernel-owner@vger.kernel.org] De la part de
> > Arne Georg Gleditsch
> >
> > Florian Attenberger <valdyn@gmail.com> writes:
> > > yep, controlled by ntpd.
> > > You're right according to
> > > ftp://hpiers.obspm.fr/iers/bul/bulc/bulletinc.33
> > > that event shouldn't have been there.
> >
> > I'm not all that versed in ntp-ish, but it appears that the
> > leap second insertion should be propagated through the ntp protocol.
> > Whether the leap second in question came from a ntp server
> > giving out wrong data or from a misinterpretation or bug in
> > ntpd is of course hard to say, but either way turning the
> > clock back is unlikely to reconstruct the circumstances. An
> > interesting exercise might be to code up a small program to
> > call adjtimex with timex.status |= STA_INS, to see if this
> > can trigger the problem. (The bogus leap second might be a
> > red herring entirely, of course...)
>
> You are probably right, I did tried to reproduce the problem without
> success...
>
> Although it is wierd that it happend only on 2.6.21 kernels... It did
> not happend on any of my workstations/servers running either 2.6.18 or
> 2.6.20.
>
> Could dynticks be involved?

I saw it on a box that happened to have lockdep enabled.
(I run it everywhere thankfully). This is what it looked like..
http://www.codemonkey.org.uk/junk/img_0421.jpg

Dave

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