Package: linux
Version: linux-2.6
Severity: important
Tags: patch

according to media reports several Debian hosted webserver had outage
on the night to the 1. of July due to the leap second.

according to davej
http://codemonkey.org.uk/2012/06/15/testing-leap-code/
RH uses this fixes:
fad0c66c4bb836d57a5f125ecd38bed653ca863a
timekeeping: Fix CLOCK_MONOTONIC inconsistency during leapsecond
dd48d708ff3e917f6d6b6c2b696c3f18c019feed
ntp: Correct TAI offset during leap second
6b43ae8a619d17c4935c3320d2ef9e92bdeed05d
ntp: Fix leap-second hrtimer livelock


media reports include
http://www.heise.de/newsticker/meldung/Schaltsekunde-Linux-kann-einfrieren-1629683.html
http://www.wired.com/wiredenterprise/2012/07/leap-second-bug-wreaks-havoc-with-java-linux/


-- System Information:
Debian Release: wheezy/sid
APT prefers testing
APT policy: (900, 'testing'), (500, 'unstable'), (1, 'experimental')
Architecture: amd64 (x86_64)

Kernel: Linux 3.2.0-2-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_GB.utf8, LC_CTYPE=en_GB.utf8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash



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On Mon, Jul 02, 2012 at 11:16:49AM +0200, maximilian attems wrote:
> according to media reports several Debian hosted webserver had outage
> on the night to the 1. of July due to the leap second.
>
> according to davej
> http://codemonkey.org.uk/2012/06/15/testing-leap-code/
> RH uses this fixes:
> fad0c66c4bb836d57a5f125ecd38bed653ca863a
> timekeeping: Fix CLOCK_MONOTONIC inconsistency during leapsecond
> dd48d708ff3e917f6d6b6c2b696c3f18c019feed
> ntp: Correct TAI offset during leap second
> 6b43ae8a619d17c4935c3320d2ef9e92bdeed05d
> ntp: Fix leap-second hrtimer livelock
>
>
> media reports include
> http://www.heise.de/newsticker/meldung/Schaltsekunde-Linux-kann-einfrieren-1629683.html
> http://www.wired.com/wiredenterprise/2012/07/leap-second-bug-wreaks-havoc-with-java-linux/
>

newer patches include these to be watched:
http://thread.gmane.org/gmane.linux.kernel/1321255/



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On Mon, 2012-07-02 at 10:04 +0000, maximilian attems wrote:
> On Mon, Jul 02, 2012 at 11:16:49AM +0200, maximilian attems wrote:
> > according to media reports several Debian hosted webserver had outage
> > on the night to the 1. of July due to the leap second.
> >
> > according to davej
> > http://codemonkey.org.uk/2012/06/15/testing-leap-code/
> > RH uses this fixes:
> > fad0c66c4bb836d57a5f125ecd38bed653ca863a
> > timekeeping: Fix CLOCK_MONOTONIC inconsistency during leapsecond

Fixes a regression introduced by 'ntp: Fix leap-second hrtimer
livelock'.

> > dd48d708ff3e917f6d6b6c2b696c3f18c019feed
> > ntp: Correct TAI offset during leap second

Minor.

> > 6b43ae8a619d17c4935c3320d2ef9e92bdeed05d
> > ntp: Fix leap-second hrtimer livelock

The livelock in question involves two threads acquiring two locks in
opposite order; prior to 3.4 they were just one lock. But there have
been reports of lockup in adjtimex() on earlier kernel versions, which
might be a similar bug.

> > media reports include
> > http://www.heise.de/newsticker/meldung/Schaltsekunde-Linux-kann-einfrieren-1629683.html
> > http://www.wired.com/wiredenterprise/2012/07/leap-second-bug-wreaks-havoc-with-java-linux/
> >
>
> newer patches include these to be watched:
> http://thread.gmane.org/gmane.linux.kernel/1321255/

That's the one that caused user-space to effectively busy-wait.

Ben.

--
Ben Hutchings
When in doubt, use brute force. - Ken Thompson

Hi Ben,

Is anything happening with this bug e.g. getting the patches into the
Debian stable kernel package (2.6.32) and a new version pushed out?
We had another meltdown at the end of August and it would be really
helpful to have an upgrade before the end of this month (September,
in 23 days).

Nothing has been added to the bug report since the 5th of last month
(August); if there is updated information could someone please update
the bug report?

Thanks/best,

--
Steve Lane
System Administrator, Scientific Computing
Joint BioEnergy Institute
Lawrence Berkeley National Laboratory


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On Fri, Sep 07, 2012 at 10:35:20AM -0700, Steve Lane wrote:
> Hi Ben,
>
> Is anything happening with this bug e.g. getting the patches into the
> Debian stable kernel package (2.6.32) and a new version pushed out?
> We had another meltdown at the end of August and it would be really
> helpful to have an upgrade before the end of this month (September,
> in 23 days).
>
> Nothing has been added to the bug report since the 5th of last month
> (August); if there is updated information could someone please update
> the bug report?

I've applied John Stultz's backport to my local tree - will commit it
after some testing.


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Awesome - thanks very much!

--
Steve Lane
System Administrator, Scientific Computing
Joint BioEnergy Institute
Lawrence Berkeley National Laboratory


On Sep 08 12:53, dann frazier wrote:
> On Fri, Sep 07, 2012 at 10:35:20AM -0700, Steve Lane wrote:
> > Hi Ben,
> >
> > Is anything happening with this bug e.g. getting the patches into the
> > Debian stable kernel package (2.6.32) and a new version pushed out?
> > We had another meltdown at the end of August and it would be really
> > helpful to have an upgrade before the end of this month (September,
> > in 23 days).
> >
> > Nothing has been added to the bug report since the 5th of last month
> > (August); if there is updated information could someone please update
> > the bug report?
>
> I've applied John Stultz's backport to my local tree - will commit it
> after some testing.


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