TBD When the Linux kernel processes a NTP add second or delete second event, it may suffer a deadlock while trying to log an informational message. The chances of this may be greater when a system is busy. All active X-Series releases use a vulnerable Linux kernel version. Disable NTP at least 24 hours before the date of each upcoming leap second (e.g. June 30, 2015). Wait a day after the leap second and then re-enable NTP. TBD TBD
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