Nagios lockup for about 8.5 hours

[Kevin Keane]

It seems to me that for some reason your system clock has changed by 
about five hours. Did you change your system by any chance from local 
time (Eastern time, probably, based on the five-hour difference) to UTC? 
Or maybe your clock had drifted for a long time. When the clock skew 
becomes too great, NTP refuses to update the time (because there is no 
way to be sure that the time signal isn't the one that's incorrect). If 
you restart NTP, it will set your clock regardless of the clock skew.

The following "immediate check" messages probably occurred because 
Nagios thought that these services hadn't been checked for five hours.

Andrew Noonan wrote:
> I've been testing out Nagios in general to replace our current system
> and I noticed a strange blank in my PNP graphs this morning.  When I
> looked closer, I found that nagios had basically hung for several
> hours.  Then, the log shows a warning of:
>
> [1246958195] Warning: A system time change of 0d 4h 56m 48s (forwards
> in time) has been detected.  Compensating...
>
> and then for several hours, messages like:
>
> [1246958830] Warning: The check of host 'superhost1' looks like it was
> orphaned (results never came back).  I'm scheduling an immediate check
> of the host...
>
> I'm running nagios 3.0.6 with ndo2db.  The system has under 1000
> services, most of which are nrpe checks to remote hosts.
>
> The nagios system was not terribly loaded at the time (about 50% idle)
> and mysql did not show any errors at the time.  Typically, the number
> of buffers used is only 2-3 out of the 4096.
>
> Any ideas as to what this could have been, or how I can detect this
> condition or log to gain more info?  I wouldn't think that this is
> normal, but my Google searches aren't turning up a lot.
>
> Thanks!
>
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