Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: linux-raspi2 (Ubuntu)
       Status: New => Confirmed

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  [uc18] docker overlayfs* seems broken

Status in linux-raspi2 package in Ubuntu:

Bug description:
  A customer recently reported that 'sudo docker run hello-world' fails
  on a pi3 or pi4 running UC18. Looking at the journal, the failure
  appears to be caused by an apparmor denial related docker's overlay2
  storage driver. I've tried both the unified and the Pi3 specific UC18
  images and both fail with the same error. The same command works fine
  on other devices running UC18 (I've tested multipass+macOS, and
  dragonboard), and also works on a Pi3b running our standard UC16

  Here are the details from the UC18 image.

  $ snap list
  core          16-2.43.3                       8691    stable    canonical✓  
  core18        20200124                        1673    stable    canonical✓  
  docker        18.09.9                         427     stable    canonical✓  -
  pi            18-1                            27      18-pi     canonical✓  
  pi-kernel     5.3.0-1019.21~18.04.1           104     18-pi     canonical✓  
  snapd         2.43.3                          6438    stable    canonical✓  

  And here's the apparmor denial:

  Mar 24 19:38:55 localhost sudo[3095]:      awe : TTY=pts/0 ; PWD=/home/awe ; 
USER=root ; COMMAND=/snap/bin/docker run hello-world
  Mar 24 19:39:02 localhost audit[2932]: AVC apparmor="DENIED" operation="open" 
 pid=2932 comm="dockerd" requested_mask="r" denied_mask="r" fsuid=0 ouid=0

  I've been told this may end up being something that gets worked around
  in snapd, however as this looks like a regression, I'm erring on the
  side of caution and filing this bug anyways.

  Please let me know if there's anything else I can provide.

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