Public bug reported:
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
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug xenial
** Attachment added: "syslog"
https://bugs.launchpad.net/bugs/1585081/+attachment/4669131/+files/syslog
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https://bugs.launchpad.net/bugs/1585081
Title:
Switching user freezes system
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