I'm not aware of any way to get the apparmor.service to print out what
profile it is working on without actually modifying the service

however your dmesg does show the reason for the failure, it looks like
the apparmor_parser is being killed by the oom killer

[ 5986.338089] [13520]     0 13520  3056587  3053749 24539136        0          
   0 apparmor_parser
[ 5986.338090] Out of memory: Kill process 13520 (apparmor_parser) score 646 or 
sacrifice child
[ 5986.338095] Killed process 13520 (apparmor_parser) total-vm:12226348kB, 
anon-rss:12214996kB, file-rss:0kB, shmem-rss:0kB

we should be able to narrow down which profile is causing the problem by
comparing the set of profiles being reported as loaded to those that are
on the system.

We can then manually run the apparmor_parser to see which profile is
using some much memory to compile

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https://bugs.launchpad.net/bugs/1830502

Title:
  apparmor fails to start with no parser errors

Status in apparmor package in Ubuntu:
  New

Bug description:
  On Ubuntu 18.04.2 LTS Desktop, after running out of space on my disk,
  my system was unable to finish booting and I had to go into recovery
  mode and remove a number of files before the system would boot. After
  doing so I discovered that now the apparmor.service systemd unit
  always fails to start. I see this in dmesg:

  [ 1066.975360] Out of memory: Kill process 6799 (apparmor_parser) score 796 
or sacrifice child
  [ 1066.975364] Killed process 6799 (apparmor_parser) total-vm:15057348kB, 
anon-rss:15046148kB, file-rss:0kB, shmem-rss:0kB
  [ 1067.406595] oom_reaper: reaped process 6799 (apparmor_parser), now 
anon-rss:0kB, file-rss:0kB, shmem-rss:0kB

  Whenever apparmor.service is attempted to be started by systemd, i.e.
  either on boot, or later with `systemctl start apparmor`.

  The log from journalctl doesn't show any actual issues with any
  profiles just this:

  -- Reboot --
  May 25 17:00:58 systemd[1]: Starting AppArmor initialization...
  May 25 17:00:58 apparmor[1521]:  * Starting AppArmor profiles
  May 25 17:00:58 apparmor[1521]: Skipping profile in /etc/apparmor.d/disable: 
usr.bin.firefox
  May 25 17:00:58 apparmor[1521]: Skipping profile in /etc/apparmor.d/disable: 
usr.sbin.rsyslogd
  May 25 17:01:40 apparmor[1521]:    ...fail!
  May 25 17:01:40 systemd[1]: apparmor.service: Main process exited, 
code=exited, status=123/n/a
  May 25 17:01:40 systemd[1]: apparmor.service: Failed with result 'exit-code'.
  May 25 17:01:40 systemd[1]: Failed to start AppArmor initialization.
  May 25 17:04:53 systemd[1]: Starting AppArmor initialization...
  May 25 17:04:53 apparmor[4747]:  * Starting AppArmor profiles
  May 25 17:04:53 apparmor[4747]: Skipping profile in /etc/apparmor.d/disable: 
usr.bin.firefox
  May 25 17:04:53 apparmor[4747]: Skipping profile in /etc/apparmor.d/disable: 
usr.sbin.rsyslogd
  May 25 17:05:25 apparmor[4747]:    ...fail!
  May 25 17:05:25 systemd[1]: apparmor.service: Main process exited, 
code=exited, status=123/n/a
  May 25 17:05:25 systemd[1]: apparmor.service: Failed with result 'exit-code'.
  May 25 17:05:25 systemd[1]: Failed to start AppArmor initialization.

  I can see that apparmor profiles are active after doing this (using
  aa-status), but it's still troubling that apparmor runs into an issue
  without actually saying what the error is.

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