Apparmor has hats like null-12b08

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http://serverfault.com – I am running a Ubuntu 12.04 server with Apache using mod_apparmor. When I run aa-status, I see thousands and thousands of profiles with names like /usr/lib/apache2/mpm-prefork/apache2//DEFAULT_URI//null-12b08 Some of them even stack: /usr/lib/apache2/mpm-prefork/apache2//scoop//null-2dd76//null-2dd77 What are these? Are they actually hats? If so, why are there so many of them, and is that a potential problem? (HowTos)