0.0 second duration motion event

[llandre]

As described here http://www.zoneminder.com/forums/viewto ... 30&t=22637 I'm experiencing some problems with zm 1.26.5.
One of the weird things that happen is the recording of 0.0 second duration events. This is one example:

Id Name Monitor Cause Time(v) Duration Frames Alarm Frames Total Score Avg. Score Max. Score
131 New Event garage-modect Motion 10/07 20:37:24 0.00 0 0 0

It seems zm detected a motion event but was unable to process it properly.
However if I restart zoneminder service (sudo service zoneminder restart), the event processing completes nicely: the event is displayed correctly in the events page and the alarm email is sent:
Id Name Monitor Cause Time(v) Duration Frames Alarm Frames Total Score Avg. Score Max. Score
131 Event-131 garage-modect Motion 10/07 20:37:24 82471.27 253159 253133 12742634 50 124

From log page:
2014-10-08 19:32:38.391460 zmfilter 8274 INF Notification email sent zmfilter.pl
2014-10-08 19:32:37.517170 zmfilter 8274 INF Attaching '/usr/share/zoneminder/events/4/14/10/07/20/37/24/135028-capture.jpg zmfilter.pl
2014-10-08 19:32:37.476090 zmfilter 8274 INF Sending notification email 'ZoneMinder: Alarm - garage-modect-131 (124 - 50 253133)' zmfilter.pl
2014-10-08 19:32:34.482669 zma_m4 8267 INF In mode 3/1, warming up zma.cpp 105
2014-10-08 19:32:34.447107 zma_m4 8267 WAR Can't link to monitor 6, invalid id, function or not enabled zm_monitor.cpp 1815
2014-10-08 19:32:34.413651 zma_m4 8267 WAR Can't link to monitor 5, invalid id, function or not enabled zm_monitor.cpp 1815
2014-10-08 19:32:34.380212 zma_m4 8267 WAR Can't link to monitor 2, invalid id, function or not enabled zm_monitor.cpp 1815
2014-10-08 19:32:34.346617 zma_m4 8267 WAR Can't link to monitor 1, invalid id, function or not enabled zm_monitor.cpp 1815
2014-10-08 19:32:34.102690 zmfilter 8274 INF Creating notification email zmfilter.pl

I honestly don't know where to look at to further investigate this problem. Anybody can give some hints?

Thank you.

[llandre]

I think I got it. I inadvertently created an undesired circular dependency between two cameras. So they was keeping alarmed each other indefinitely!

[gutbuket]

Thanks - hadn't realised I did exactly the same thing with a circular dependency.