Problem with nagiosgraph, stops appending to the rrd files

[jobst]

Hi,

I have been some very stange problems with nagiosgraph, it stops appending to the rrd files but the scheduler still works.
I have set the debug level to 5 to figure this one out, but nor error message appears, it just stops.

This is what happens:

1 /etc/rc.d/init.d/nagios restart
2 I see messages appear in /var/log/nagiosgraph/nagiosgraph.log, e.g "debug insert.pl processing started" and "Wed Jul 24 19:15:32 2013 p1.pl debug createrrd(1374657096,piquet,CPULOAD,user)" and so on
3 I can see the rrd files being created, e.g. "CurrentLoad___load15.rrd" in "/var/nagiosgraph/rrd/piquet"
4 I can see in the "Scheduling Queue" changing, e.g. if I sort by "Next Check (asc)" I can always see the next item on the top of the list that is next in the queue and this changes all the time
5 I can see the graphs for the services I want to plot, and I can see data being added to the graphs (if I refresh)
6 all seems ok
7 then suddenly the debug messages stop
8 the Scheduling Queue still changes (i.e. next one on top)
9 the rrd files are not appended anymore.
10 If I restart nagios the next time it will stop it will NOT be on the same service, it will stop at another one.

This is what I tried:

1 disabled all hosts but one host only
2 disabled all services but a couple for that one host
3 restarted nagios
4 then I started appending services and hosts again (inc restarting) waiting for a full cycle in the queue to see whether it stops
5 I checked all plugins for correct output on the command line

I have no idea what is going on, it simply stops appending data to the rrd files, the debug messages stop at the same time.

Any help is appreciated.
jobst

[abrist]

What version of core are you running?
Did you do any major changes/upgrades right before the behavior started?