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Bogus leap second disrupts Linux systems

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Linux

During the night of 31 July to 1 August, various servers that provide time information via NTP (Network Time Protocol) incorrectly announced that clients should apply a leap second. On Tuesday evening, Marco Marongiu pointed to this issue on one of the NTP project's mailing lists. Now, reports from users whose systems applied a leap second at 00:00 Coordinated Universal Time (UTC) – 2am CET – can be found in places such as a Mythtv forum, on Twitter, on Google+ and on the NTP project's mailing lists.

Unlike at the previous turn of the month, no leap second was scheduled to be applied last night. Occasionally added at the end of June or December, such extra seconds are introduced to ensure that Coordinated Universal Time never deviates from UT1 astronomical time by more than 0.9 seconds; this is designed to keep clock time close to the time of day (i.e. the actual position of the sun).

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