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[John Johansen <john.johansen@xxxxxxxxxxxxx>]

Correct.

There are actually several ways to get disconnected paths and this
specific one is being caused by the new file ns. The proper fix for this
is delegating access to the object that would not normally be
accessible, however delegation is not available in the current releases
of apparmor and the HACK of attach disconnected is being used to work
around this.

As for apparmor not complaining about disconnected path failures, it should be unless attach disconnected is specified. The info field in the apparmor audit message will be
  info="Failed name lookup - disconnected path"

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https://bugs.launchpad.net/bugs/1373070

Title:
  full fix for disconnected path (paths)

Status in cups package in Ubuntu:
  Fix Released
Status in linux package in Ubuntu:
  Triaged
Status in rsyslog package in Ubuntu:
  New

Bug description:
  With the apparmor 3 RC1 upload, there is an incomplete bug fix for
  disconnected paths. This bug is to track that work.

  This denial may be related:
  Sep 23 10:10:50 localhost kernel: [40262.517799] audit: type=1400 audit(1411485050.722:2862): apparmor="DENIED" operation="sendmsg" info="Failed name lookup - disconnected path" error=-13 profile="/usr/sbin/rsyslogd" name="dev/log" pid=7011 comm="logger" requested_mask="r" denied_mask="r" fsuid=0 ouid=0

  This is related to bug 1375410

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