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[Tyler Hicks <tyhicks@xxxxxxxxxxxxx>]

I was able to hit this in 14.04 with linux-generic-lts-wily installed:

  $ cat /proc/version_signature 
  Ubuntu 4.2.0-41.48~14.04.1-generic 4.2.8-ckt11

The 14.04 apparmor_parser doesn't support unix rules, so you need to
check out lp:apparmor, build libapparmor and the parser and the
unix_socket regression tests before using the reproducer in the bug
description.

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https://bugs.launchpad.net/bugs/1378123

Title:
  unix_socket_abstract.sh triggers an AppArmor WARN

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Running the unix_socket_abstract.sh regression test script in a loop
  results in an AppArmor WARN message in the logs. On my test system, it
  typically takes between 1 and 3 runs of unix_socket_abstract.sh before
  the WARN is hit. It does not seem to occur with the
  unix_socket_pathname.sh or unix_socket_unnamed.sh tests.

  Here's the script I used:

  ---
  #!/bin/sh

  dmesg -C
  while ! dmesg -c | grep "AppArmor WARN"; do
          bash unix_socket_abstract.sh
  done
  ---

  The following back trace is emitted in the logs:

  [ 1365.017477] ------------[ cut here ]------------
  [ 1365.017486] WARNING: CPU: 0 PID: 26026 at /build/buildd/linux-3.16.0/security/apparmor/label.c:1767 __aa_labelset_update_all+0x6f5/0x7f0()
  [ 1365.017487] AppArmor WARN __label_update: ((__aa_label_remove_and_insert((&(((label)->ent[(label)->size - 1])->ns)->labels), label, l) != l)):
  [ 1365.017489] Modules linked in: bnep rfcomm bluetooth 6lowpan_iphc kvm_intel kvm vmwgfx ttm drm_kms_helper serio_raw drm i2c_piix4 pvpanic parport_pc ppdev mac_hid lp parport psmouse pata_acpi floppy
  [ 1365.017505] CPU: 0 PID: 26026 Comm: apparmor_parser Tainted: G        W     3.16.0-20-generic #27-Ubuntu
  [ 1365.017507] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
  [ 1365.017509]  0000000000000009 ffff88002dd23d88 ffffffff8177f053 ffff88002dd23dd0
  [ 1365.017511]  ffff88002dd23dc0 ffffffff8106fcfd ffff880036602900 0000000000000000
  [ 1365.017513]  ffff88003acaed00 0000000000000002 ffff88003e02a0a0 ffff88002dd23e20
  [ 1365.017516] Call Trace:
  [ 1365.017522]  [<ffffffff8177f053>] dump_stack+0x45/0x56
  [ 1365.017527]  [<ffffffff8106fcfd>] warn_slowpath_common+0x7d/0xa0
  [ 1365.017530]  [<ffffffff8106fd6c>] warn_slowpath_fmt+0x4c/0x50
  [ 1365.017533]  [<ffffffff8133f00e>] ? __aa_label_remove_and_insert+0x7e/0x1a0
  [ 1365.017536]  [<ffffffff81342c95>] __aa_labelset_update_all+0x6f5/0x7f0
  [ 1365.017539]  [<ffffffff812fc5ca>] ? securityfs_remove+0x9a/0xb0
  [ 1365.017542]  [<ffffffff81338213>] aa_remove_profiles+0x143/0x4f0
  [ 1365.017545]  [<ffffffff8132f43e>] profile_remove+0x3e/0x70
  [ 1365.017550]  [<ffffffff811e02c7>] vfs_write+0xb7/0x1f0
  [ 1365.017552]  [<ffffffff811df439>] ? do_sys_open+0x1b9/0x280
  [ 1365.017555]  [<ffffffff811e0e76>] SyS_write+0x46/0xb0
  [ 1365.017558]  [<ffffffff817870ad>] system_call_fastpath+0x1a/0x1f
  [ 1365.017560] ---[ end trace 1e09e2c565d9ef95 ]---

  This occurs in an amd64 utopic vm:

  $ uname -a
  Linux sec-utopic-amd64 3.16.0-20-generic #27-Ubuntu SMP Wed Oct 1 17:35:12 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux

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