It looks like this hang issue was introduced because the mmap test has timed 
out.
And it gets killed by the autotest framework.

However it's not really "killed", you can see that it's still stuck with
mmap test:

# ps aux
root     23787  0.0  0.0   4384   748 ?        S    06:21   0:00 
/tmp/testlibpIXHkr/source/bionic/apparmor-2.12/tests/regression/apparmor/mmap

# ps aux |grep Z
USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
ubuntu    2138  0.0  0.0      0     0 ?        Z    05:48   0:00 [sh] <defunct>
root      8307  0.0  0.0      0     0 ?        Z    10:15   0:00 
[unix_socket_cli] <defunct>

In this case, with PID 23787 killed, the test will keep going and
terminates on jenkins properly.

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https://bugs.launchpad.net/bugs/1783922

Title:
  ubuntu_qrt_apparmor will hang with Bionic kernel on KVM instance (mmap
  test timeout)

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