When using ntpd, then 'leap second deletions' events are received, but not carried out by the system.

Solution Verified - Updated -

Issue

We simulated sending the LI bit(=10) from the NTP server. Ntpd on the NTP client received the LI bit(=10) (confirmed by tcpdump). The bit is not set in the kernel though, "ntpq -c rv" shows "00" in the leap field. Even after the leap second deletion time elapsed, the leap second were not deleted by the NTP client and ticked "23:59:59".

Environment

  • Red Hat Enterprise Linux (RHEL) 6 and 7
  • NTP
  • ntpd
  • leap second deletion

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