David,
is there any reason you believe your freezes are related to this bug? I ask
because it is important to open another bug if it turns out your problems
aren't this bug, so that it can be properly tracked.
After you experience the freeze can you run
apport-collect -p linux 446164
Also there is a test kernel which may fix this bug at
http://kernel.ubuntu.com/~jj/linux-image-2.6.31-15-generic_2.6.31-15.50~jj_amd64.deb
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BUG: unable to handle kernel NULL pointer dereference at 00000040
apparmor_bprm_set_creds
https://bugs.launchpad.net/bugs/446164
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