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

[Edmund White]

I've been following this on Server Fault today:
http://serverfault.com/q/403732/13325 provides the full explanation and
post-mortem.

Some of my EL6 systems are showing abnormally-high loads.

-- 
Edmund White
ewwhite at mac.com




On 6/30/12 9:27 PM, "Brian Wheeler" <bdwheele at indiana.edu> wrote:

>Sorry for the plethora of replies.  Strike the RHEL5 case -- it must
>have been hit by something else when I was doing my testing -- it seems
>to have calmed down now.
>
>Brian
>
>On 06/30/2012 10:24 PM, Brian Wheeler wrote:
>> I should add that I have a RHEL5 box which got the leap second and
>> snmp is reporting it is using 100% cpu but has a paltry loadavg of 3,
>> so it may be affected as well.
>>
>> Brian
>>
>> On 06/30/2012 10:18 PM, Brian Wheeler wrote:
>>> Yes, some of my machines are going crazy. I've found that rebooting
>>> them seems to work around it...
>>>
>>> Brian
>>>
>>>
>>> On 06/30/2012 10:17 PM, David Coulson wrote:
>>>> 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.
>>>>
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>>>
>>>
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