Mingle running on Debian could take very high CPU due to a leap second at 23:59:60 UTC
This problem is discussed in detail in articles below.
- Equivalent article in Linux Kernel Mailing List:http://marc.info/?l=linux-kernel&m=134113389621450&w=2
One way to verify would be to check if the date/time on the CPU graph matches the event.
The fix is to run
$date -s "`date`"