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[DavidEG <davidegx@xxxxxxxxx>]

Since I've upgraded to 16.04 I've started to experience these system crashes:
* Sometimes, when I plug/unplug an external hdmi monitor.
* Sometimes, when I shutdown the machine.
Haven't reported those as they happen a bit randomly. I am not able to reproduce them at my will.

The one reported here, happens always. Before upgrading to 16.04 I only
had one user so I don't know if the problem was there. That said, my
feeling is that it is caused by the upgrade because the aforementioned
issues.

Tested with the upstream kernel. The issue disappears
(4.6.0-040600-generic #201605151930).

** Changed in: linux (Ubuntu)
       Status: Incomplete => Confirmed

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https://bugs.launchpad.net/bugs/1585081

Title:
  Switching user freezes system

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Just doing this my system freezes:

  1. Click on the top right gear icon.
  2. Select a different user account.

  Login screen appears briefly, then black screen and the system is
  death:

  BUG: unable to handle kernel NULL pointer dereference at 0000000000000248
  IP: [<ffffffffc0258eb2>] amdgpu_vm_grab_id+0x122/0x310 [amdgpu]
  PGD 0
  Oops: 0000 [#1] SMP
  Modules linked in:  ...
  (See attached syslog for more)

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-22-generic 4.4.0-22.40
  ProcVersionSignature: Ubuntu 4.4.0-22.40-generic 4.4.8
  Uname: Linux 4.4.0-22-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  david      2739 F.... pulseaudio
   /dev/snd/controlC1:  david      2739 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Tue May 24 08:54:13 2016
  HibernationDevice: RESUME=UUID=d225720a-fc40-49a3-9182-17d278d40460
  InstallationDate: Installed on 2015-06-29 (329 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
  MachineType: TOSHIBA SATELLITE S50-B
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-22-generic.efi.signed root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-22-generic N/A
   linux-backports-modules-4.4.0-22-generic  N/A
   linux-firmware                            1.157
  SourcePackage: linux
  UpgradeStatus: Upgraded to xenial on 2016-04-22 (31 days ago)
  dmi.bios.date: 12/02/2014
  dmi.bios.vendor: INSYDE Corp.
  dmi.bios.version: 2.00
  dmi.board.asset.tag: Type2 - Board Asset Tag
  dmi.board.name: Type2 - Board Product Name1
  dmi.board.vendor: Type2 - Board Vendor Name1
  dmi.board.version: Type2 - Board Version
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: OEM Chassis ManuFacturer
  dmi.chassis.version: OEM Chassis Version
  dmi.modalias: dmi:bvnINSYDECorp.:bvr2.00:bd12/02/2014:svnTOSHIBA:pnSATELLITES50-B:pvrPSPQEE-00F00JEN:rvnType2-BoardVendorName1:rnType2-BoardProductName1:rvrType2-BoardVersion:cvnOEMChassisManuFacturer:ct10:cvrOEMChassisVersion:
  dmi.product.name: SATELLITE S50-B
  dmi.product.version: PSPQEE-00F00JEN
  dmi.sys.vendor: TOSHIBA

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