The file property has changed from 4.4.0-121 to 4.4.0-123

* 4.4.0-121:
$ ll /sys/module/apparmor/parameters/path_max
-rw-r--r-- 1 root root 4096 May  3 09:11 
/sys/module/apparmor/parameters/path_max

* 4.4.0-123:
$ ll /sys/module/apparmor/parameters/path_max
-r--r--r-- 1 root root 4096 May  3 08:23 
/sys/module/apparmor/parameters/path_max

This might be the cause of this permission denied issue.

So maybe it's the tool that needs some modification, I will add the qa-
regression-testing project to this bug as well.

** Also affects: qa-regression-testing
   Importance: Undecided
       Status: New

** Tags removed: trusty
** Tags added: xenial

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https://bugs.launchpad.net/bugs/1768784

Title:
  longpath test in the apparmor test failed with permission denied

Status in QA Regression Testing:
  New
Status in linux package in Ubuntu:
  Incomplete

Bug description:
  THIS IS A POTENTIAL REGRESSION

  The ubuntu_qrt_apparmor test suite has passed with the kernel in
  -released (4.4.0-121) but not the one in -proposed (4.4.0-123)

  longpath test in the test_regression_testsuite will fail with:
    running longpath
    longpath.sh: line 53: /sys/module/apparmor/parameters/path_max: Permission 
denied
    Fatal Error (longpath): Unexpected shell error. Run with -x to debug
    
  This issue can be spotted both on Xenial kernel and the Xenial kernel on 
Trusty.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-4.4.0-123-generic 4.4.0-123.147~14.04.1
  ProcVersionSignature: User Name 4.4.0-123.147~14.04.1-generic 4.4.128
  Uname: Linux 4.4.0-123-generic i686
  ApportVersion: 2.14.1-0ubuntu3.27
  Architecture: i386
  Date: Thu May  3 08:55:33 2018
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: linux-lts-xenial
  UpgradeStatus: No upgrade log present (probably fresh install)

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