This also happened to me, but it happened to me because my server was using four of the Dutch Surfnet stratum 1 servers as a source, who were all announcing the leap second, and the other two servers I had configured did not. But because the Surfnet servers are Stratum 1, I think NTPd chose to believe them instead of the servers that were not announcing the leap second.
Tom ________________________________ From: [email protected] [[email protected]] on behalf of César de Tassis Filho [[email protected]] Sent: 03 January 2013 16:33 To: David J Taylor Cc: [email protected] Subject: Re: [Pool] why some ntp servers tried to insert a leap second 2 daysago? Hello. This happened to one of my servers (as you can see here [1] or here [2]), but I don't know if it was caused by a bug in my Debian Linux or if my NTPd trusted a wrong source. César [1] - http://i.imgur.com/uvbep.png [2] - http://www.pool.ntp.org/scores/50.115.174.192 On Thu, Jan 3, 2013 at 12:07 PM, David J Taylor <[email protected]<mailto:[email protected]>> wrote: From: Franck Martin We noticed several ntp servers tried to insert a leap second on 31st December 2012. There was no leap second insertion scheduled for that date. http://en.wikipedia.org/wiki/Leap_second#Insertion_of_leap_seconds and ftp://hpiers.obspm.fr/iers/bul/bulc/bulletinc.dat The linux kernel seems to still have bugs regarding this, that ripples in user space. http://it.slashdot.org/story/12/07/01/1920217/leap-second-bug-causes-crashes which lead then to a high power usage in some data centers: http://www.datacenterknowledge.com/archives/2012/07/03/hosts-leap-second-caused-spike-power-usage/ Nevertheless, why so many ntp servers tried to insert a leap second? PS: Will we have to call John MacClane (http://en.wikipedia.org/wiki/Live_Free_or_Die_Hard#Plot) in June 2013? ;) ======================================================= Franck, did you happen to notice which version of NTP those servers were running? Current versions of NTP require a majority vote before adding a leap-second, whereas earlier versions only needed one server's flag set to mark a leap-second. I recall this is from a few years back, now, though. The Windows, FreeBSD and Linux systems here were unaffected, and are all running a recent development branch of NTP. Cheers, David -- SatSignal Software - Quality software written to your requirements Web: http://www.satsignal.eu Email: [email protected]<mailto:[email protected]> _______________________________________________ pool mailing list [email protected]<mailto:[email protected]> http://lists.ntp.org/listinfo/pool
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