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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