Ah those "upstream" kernels weren't pure... Just tested manually compiled 
kernel master branch and tag 4.2, no issues. Copied over a packaged one: 
problem reappears.
It's not a container problem though. Running this on a host has the same effect:
# aa-exec -p $pick_your_favorite_profile -- socat 
UNIX:/var/spool/postfix/public/showq -
also gets an EPERM.
Also not 32/64 bit dependent, however we do have some containers where it 
always works, and some where it always fails, and that was their only obvious 
distinction, which now seems unrelated.

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https://bugs.launchpad.net/bugs/1390223

Title:
  Apparmor related regression on access to unix sockets on a candidate
  3.16 backport kernel

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