asterisk users - Nov 2014 - Asterisk 12 is broken

The amount of threads went through the roof
ls /proc/15373/task | wc -l
682
in version SVN-branch-12-r427618M
it used to be 18 in Asterisk SVN-branch-11-r412226M

How can I trace this? There are no calls open, on a disconnected system
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