Comment 32 for bug 1587886

Hmm, strange, I retried with a new instance too, now after adding the commands that you missed:

# add-apt-repository cloud-archive:newton
# apt update;apt install strongswan neutron-vpn-agent
# mkdir /tmp/test
# ip netns add testns

I can reproduce with the modified command

# ip netns exec testns neutron-vpn-netns-wrapper --mount_paths "/mnt:/tmp/test" --cmd "ipsec,status"
2017-02-08 09:20:15.731 17729 INFO neutron.common.config [-] Logging enabled!
2017-02-08 09:20:15.732 17729 INFO neutron.common.config [-] /usr/bin/neutron-vpn-netns-wrapper version 9.0.0
Command: ['mount', '--bind', '/tmp/test', '/mnt'] Exit code: 0 Stdout: Stderr: 2017-02-08 09:20:15.744 17729 INFO neutron_vpnaas.services.vpn.common.netns_wrapper [-] /tmp/test has been bind-mounted in /mnt
Command: ['ipsec', 'status'] Exit code: 0 Stdout: Stderr: connecting to 'unix:///var/run/charon.ctl' failed: Permission denied
failed to connect to stroke socket 'unix:///var/run/charon.ctl'

and in the systemd journal I get a matching message:

Feb 08 09:20:15 jr-ansi02 audit[17738]: AVC apparmor="DENIED" operation="connect" info="Failed name lookup - disconnected path" error=-13 profile="/usr/lib/ipsec/stroke" name="run/charon.ctl" pid=17738 comm="stroke" requested_mask="wr" denied_mask="wr" fsuid=0 ouid=0

The unwrapped command is indeed doing fine in comparison:

# ipsec status
Security Associations (0 up, 0 connecting):
  none

After adding the flags from your patch into the profile and restarting apparmor, the issue is resolved:

# ip netns exec testns neutron-vpn-netns-wrapper --mount_paths "/mnt:/tmp/test" --cmd "ipsec,status"
2017-02-08 09:24:47.555 17912 INFO neutron.common.config [-] Logging enabled!
2017-02-08 09:24:47.557 17912 INFO neutron.common.config [-] /usr/bin/neutron-vpn-netns-wrapper version 9.0.0
Command: ['mount', '--bind', '/tmp/test', '/mnt'] Exit code: 0 Stdout: Stderr: 2017-02-08 09:24:47.568 17912 INFO neutron_vpnaas.services.vpn.common.netns_wrapper [-] /tmp/test has been bind-mounted in /mnt
Command: ['ipsec', 'status'] Exit code: 0 Stdout: Security Associations (0 up, 0 connecting):
  none