Linux kernel wedging 30-Jun UTC in adjtimex()/ntp_adjtime()

Linux kernels 2.6.26 and later are reported at risk of livelock the
day preceding the leap insertion. I haven't found the first version
number with the fix. This is distinct from the earlier bug logging
the actual insertion event.

and mentioned there:

The Red Hat knowledge base article wasn't updated a moment ago when I checked.

Dave Hart