[rhelv6-list] CPU utilization issue following leap second insertion

[David Coulson]

Most of my RHEL6 systems running Java applications went nuts when the 
leap second was added:

[root at rhtsutility02 stuff]# ssh rhesdevwesb01 grep UTC /var/log/messages
Jun 30 19:59:59 rhesdevwesb01 kernel: Clock: inserting leap second 
23:59:60 UTC

Output of sar during interval in question
07:59:01 PM     all      0.12      0.00      0.20      0.00 0.00     99.68
08:00:07 PM     all      8.18      0.02      4.14      0.00 0.00     87.66
08:01:07 PM     all     70.08      0.00     29.92      0.00 0.00      0.00
08:02:07 PM     all     69.49      0.00     30.51      0.00 0.00      0.00
08:03:07 PM     all     69.61      0.00     30.39      0.00 0.00      0.00
08:04:07 PM     all     69.76      0.00     30.24      0.00 0.00      0.00

I've RHEL4 and RHEL5 systems running the same apps, same JVM, same J2EE 
(mostly WebSphere), and they were all fine.

A couple of my RHEL6 boxes didn't log the 'inserting leap second' dmesg 
entry, and they did not exhibit an issue - Not sure why they did not log 
it, since they are all using the same NTP clock sources.

Anyone else see this? I'm going to grab a bunch of sosreports and get a 
case open, but wanted to see if it was something unique to my environment.