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[Kees Cook <kees@xxxxxxxxxx>]

** Attachment added: "three.txt"
   https://bugs.launchpad.net/apparmor/+bug/1448912/+attachment/4429579/+files/three.txt

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https://bugs.launchpad.net/bugs/1448912

Title:
  BUG: unable to handle kernel NULL pointer dereference (aa_label_merge)

Status in AppArmor:
  Confirmed
Status in linux package in Ubuntu:
  Confirmed

Bug description:
  I had a kernel problem with one of my high availability VMs. This was not the first occurence of the problem, it seems to appear every now and then.
  The VM froze because of the Kernel bug appended as a text file. I had to hard reset it.
  I am running Ubuntu 14.04.2 Kernel 3.16.0-34-generic with libapache2-mod-apparmor 2.8.95~2430-0ubuntu5.1 and apache 2.4.7-1ubuntu4.4 (mpm_prefork).
  Unfortunately I am unable to reproduce the bug at will. This is a serious problem for high availability VMs.
  Looking at the trace, I assume this is a bug in AppArmor.
  --- 
  AlsaDevices:
   total 0
   crw-rw---- 1 root audio 116,  1 May 15 14:13 seq
   crw-rw---- 1 root audio 116, 33 May 15 14:13 timer
  AplayDevices: Error: [Errno 2] No such file or directory
  ApportVersion: 2.14.1-0ubuntu3.10
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
  CRDA: Error: [Errno 2] No such file or directory
  DistroRelease: Ubuntu 14.04
  HibernationDevice: RESUME=UUID=69e1aff7-c3d1-4bf4-8685-bd3fc2942f60
  InstallationDate: Installed on 2015-03-25 (61 days ago)
  InstallationMedia: Ubuntu-Server 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
  IwConfig:
   eth0      no wireless extensions.
   
   lo        no wireless extensions.
  Lsusb:
   Bus 001 Device 002: ID 0627:0001 Adomax Technology Co., Ltd 
   Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  MachineType: QEMU Standard PC (i440FX + PIIX, 1996)
  Package: linux (not installed)
  PciMultimedia:
   
  ProcEnviron:
   LANGUAGE=en_US:en
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 cirrusdrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-37-generic root=UUID=fea3075f-a9a3-414b-992a-b812d86cd04e ro
  ProcVersionSignature: Ubuntu 3.16.0-37.51~14.04.1-generic 3.16.7-ckt9
  RelatedPackageVersions:
   linux-restricted-modules-3.16.0-37-generic N/A
   linux-backports-modules-3.16.0-37-generic  N/A
   linux-firmware                             1.127.11
  RfKill: Error: [Errno 2] No such file or directory
  Tags:  trusty
  Uname: Linux 3.16.0-37-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:
   
  WifiSyslog:
   
  _MarkForUpload: True
  dmi.bios.date: 04/01/2014
  dmi.bios.vendor: SeaBIOS
  dmi.bios.version: rel-1.7.5.1-0-g8936dbb-20141113_115728-nilsson.home.kraxel.org
  dmi.chassis.type: 1
  dmi.chassis.vendor: QEMU
  dmi.chassis.version: pc-i440fx-2.2
  dmi.modalias: dmi:bvnSeaBIOS:bvrrel-1.7.5.1-0-g8936dbb-20141113_115728-nilsson.home.kraxel.org:bd04/01/2014:svnQEMU:pnStandardPC(i440FX+PIIX,1996):pvrpc-i440fx-2.2:cvnQEMU:ct1:cvrpc-i440fx-2.2:
  dmi.product.name: Standard PC (i440FX + PIIX, 1996)
  dmi.product.version: pc-i440fx-2.2
  dmi.sys.vendor: QEMU

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