Public bug reported:

I've attempted to change the size of my mouse pointer (Settings /
Universal Access / Cursor Size) from the default. As soon as I did this
the desktop froze and eventually turned black.

I could ssh in and would see the Xorg process consuming 100% cpu (per
top). After killing -9 that Xorg process, and resetting dconf reset
/org/gnome/desktop/interface/cursor-size  I could log in to a new
session.

This seems reproducible, i.e. setting up pointer size again would give
me the same symptoms.


Apport probably collected this but jic, could see this in Xorg.log:

[  1552.379] (EE) 
[  1552.380] (EE) Backtrace:
[  1552.380] (EE) 0: /usr/lib/xorg/Xorg (OsLookupColor+0x13c) [0x563325a93dec]
[  1552.381] (EE) 1: /lib/x86_64-linux-gnu/libpthread.so.0 (funlockfile+0x60) 
[0x7f2f998ab41f]
[  1552.381] (EE) 2: /usr/lib/xorg/Xorg (RamDacHandleColormaps+0xb2f) 
[0x5633259b337f]
[  1552.381] (EE) 3: /usr/lib/xorg/Xorg (AddTraps+0x5d58) [0x563325a11648]
[  1552.382] (EE) 4: /usr/lib/xorg/Xorg (FreeCursor+0x67) [0x563325926267]
[  1552.382] (EE) 5: /usr/lib/xorg/Xorg (ChangeWindowAttributes+0xa41) 
[0x563325960cf1]
[  1552.382] (EE) 6: /usr/lib/xorg/Xorg (ProcBadRequest+0x223) [0x56332592cad3]
[  1552.382] (EE) 7: /usr/lib/xorg/Xorg (SendErrorToClient+0x354) 
[0x563325932f44]
[  1552.382] (EE) 8: /usr/lib/xorg/Xorg (InitFonts+0x3b4) [0x563325936fd4]
[  1552.382] (EE) 9: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0xf3) 
[0x7f2f996c90b3]
[  1552.383] (EE) 10: /usr/lib/xorg/Xorg (_start+0x2e) [0x563325920a3e]
[  1552.383] (EE) 
[  1552.383] (EE) Segmentation fault at address 0x7
[  1552.383] (EE) 
Fatal server error:
[  1552.383] (EE) Caught signal 11 (Segmentation fault). Server aborting
[  1552.383] (EE) 
[  1552.383] (EE) 
Please consult the The X.Org Foundation support 
         at http://wiki.x.org
 for help. 
[  1552.383] (EE) Please also check the log file at "/var/log/Xorg.1.log" for 
additional information.
[  1552.383] (EE) 
[  1552.383] (EE) NVIDIA(0): The NVIDIA X driver has encountered an error; 
attempting to
[  1552.383] (EE) NVIDIA(0):     recover...
[  1555.389] (EE) NVIDIA(GPU-0): Failed to initialize DMA.
[  1556.391] (EE) NVIDIA(0): Failed to allocate push buffer
[  1556.391] (EE) NVIDIA(0): Error recovery failed.
[  1556.391] (EE) NVIDIA(0):  *** Aborting ***
[  1556.391] (EE) 
FatalError re-entered, aborting
[  1556.391] (EE) Failed to recover from error!

Let me know if I can help with diagnostics / repro

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: xorg 1:7.7+19ubuntu14
ProcVersionSignature: Ubuntu 5.4.0-29.33-generic 5.4.30
Uname: Linux 5.4.0-29-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp nvidia_modeset zcommon znvpair 
nvidia
.proc.driver.nvidia.gpus.0000.02.00.0: Error: [Errno 21] Is a directory: 
'/proc/driver/nvidia/gpus/0000:02:00.0'
.proc.driver.nvidia.registry: Binary: ""
.proc.driver.nvidia.suspend: suspend hibernate resume
.proc.driver.nvidia.suspend_depth: default modeset uvm
.proc.driver.nvidia.version:
 NVRM version: NVIDIA UNIX x86_64 Kernel Module  440.64  Fri Feb 21 01:17:26 
UTC 2020
 GCC version:
ApportVersion: 2.20.11-0ubuntu27
Architecture: amd64
BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
CasperMD5CheckResult: skip
CompositorRunning: None
CurrentDesktop: ubuntu:GNOME
Date: Tue May 12 21:18:28 2020
DistUpgraded: Fresh install
DistroCodename: focal
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes
GpuHangFrequency: This is the first time
GraphicsCard:
 Intel Corporation UHD Graphics 620 [8086:5917] (rev 07) (prog-if 00 [VGA 
controller])
   Subsystem: Lenovo UHD Graphics 620 [17aa:225b]
   Subsystem: Lenovo GP108GLM [Quadro P500 Mobile] [17aa:225b]
InstallationDate: Installed on 2020-04-25 (17 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
MachineType: LENOVO 20LB000KGE
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.4.0-29-generic 
root=UUID=4ba6b1d7-81de-4b61-b9df-0cd72af5d17e ro quiet splash vt.handoff=7
SourcePackage: xorg
Symptom: display
Title: Xorg freeze
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 04/30/2019
dmi.bios.vendor: LENOVO
dmi.bios.version: N27ET35W (1.21 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20LB000KGE
dmi.board.vendor: LENOVO
dmi.board.version: Not Defined
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.modalias: 
dmi:bvnLENOVO:bvrN27ET35W(1.21):bd04/30/2019:svnLENOVO:pn20LB000KGE:pvrThinkPadP52s:rvnLENOVO:rn20LB000KGE:rvrNotDefined:cvnLENOVO:ct10:cvrNone:
dmi.product.family: ThinkPad P52s
dmi.product.name: 20LB000KGE
dmi.product.sku: LENOVO_MT_20LB_BU_Think_FM_ThinkPad P52s
dmi.product.version: ThinkPad P52s
dmi.sys.vendor: LENOVO
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.101-2
version.libgl1-mesa-dri: libgl1-mesa-dri 20.0.4-2ubuntu1
version.libgl1-mesa-glx: libgl1-mesa-glx N/A
version.nvidia-graphics-drivers: nvidia-graphics-drivers-* N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.20.8-2ubuntu2
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.1.0-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20200226-1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.16-1

** Affects: xorg (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug focal freeze ubuntu

-- 
You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/1878278

Title:
  Xorg freeze after mouse pointer size change

Status in xorg package in Ubuntu:
  New

Bug description:
  I've attempted to change the size of my mouse pointer (Settings /
  Universal Access / Cursor Size) from the default. As soon as I did
  this the desktop froze and eventually turned black.

  I could ssh in and would see the Xorg process consuming 100% cpu (per
  top). After killing -9 that Xorg process, and resetting dconf reset
  /org/gnome/desktop/interface/cursor-size  I could log in to a new
  session.

  This seems reproducible, i.e. setting up pointer size again would give
  me the same symptoms.

  
  Apport probably collected this but jic, could see this in Xorg.log:

  [  1552.379] (EE) 
  [  1552.380] (EE) Backtrace:
  [  1552.380] (EE) 0: /usr/lib/xorg/Xorg (OsLookupColor+0x13c) [0x563325a93dec]
  [  1552.381] (EE) 1: /lib/x86_64-linux-gnu/libpthread.so.0 (funlockfile+0x60) 
[0x7f2f998ab41f]
  [  1552.381] (EE) 2: /usr/lib/xorg/Xorg (RamDacHandleColormaps+0xb2f) 
[0x5633259b337f]
  [  1552.381] (EE) 3: /usr/lib/xorg/Xorg (AddTraps+0x5d58) [0x563325a11648]
  [  1552.382] (EE) 4: /usr/lib/xorg/Xorg (FreeCursor+0x67) [0x563325926267]
  [  1552.382] (EE) 5: /usr/lib/xorg/Xorg (ChangeWindowAttributes+0xa41) 
[0x563325960cf1]
  [  1552.382] (EE) 6: /usr/lib/xorg/Xorg (ProcBadRequest+0x223) 
[0x56332592cad3]
  [  1552.382] (EE) 7: /usr/lib/xorg/Xorg (SendErrorToClient+0x354) 
[0x563325932f44]
  [  1552.382] (EE) 8: /usr/lib/xorg/Xorg (InitFonts+0x3b4) [0x563325936fd4]
  [  1552.382] (EE) 9: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0xf3) 
[0x7f2f996c90b3]
  [  1552.383] (EE) 10: /usr/lib/xorg/Xorg (_start+0x2e) [0x563325920a3e]
  [  1552.383] (EE) 
  [  1552.383] (EE) Segmentation fault at address 0x7
  [  1552.383] (EE) 
  Fatal server error:
  [  1552.383] (EE) Caught signal 11 (Segmentation fault). Server aborting
  [  1552.383] (EE) 
  [  1552.383] (EE) 
  Please consult the The X.Org Foundation support 
           at http://wiki.x.org
   for help. 
  [  1552.383] (EE) Please also check the log file at "/var/log/Xorg.1.log" for 
additional information.
  [  1552.383] (EE) 
  [  1552.383] (EE) NVIDIA(0): The NVIDIA X driver has encountered an error; 
attempting to
  [  1552.383] (EE) NVIDIA(0):     recover...
  [  1555.389] (EE) NVIDIA(GPU-0): Failed to initialize DMA.
  [  1556.391] (EE) NVIDIA(0): Failed to allocate push buffer
  [  1556.391] (EE) NVIDIA(0): Error recovery failed.
  [  1556.391] (EE) NVIDIA(0):  *** Aborting ***
  [  1556.391] (EE) 
  FatalError re-entered, aborting
  [  1556.391] (EE) Failed to recover from error!

  Let me know if I can help with diagnostics / repro

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: xorg 1:7.7+19ubuntu14
  ProcVersionSignature: Ubuntu 5.4.0-29.33-generic 5.4.30
  Uname: Linux 5.4.0-29-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp nvidia_modeset zcommon znvpair 
nvidia
  .proc.driver.nvidia.gpus.0000.02.00.0: Error: [Errno 21] Is a directory: 
'/proc/driver/nvidia/gpus/0000:02:00.0'
  .proc.driver.nvidia.registry: Binary: ""
  .proc.driver.nvidia.suspend: suspend hibernate resume
  .proc.driver.nvidia.suspend_depth: default modeset uvm
  .proc.driver.nvidia.version:
   NVRM version: NVIDIA UNIX x86_64 Kernel Module  440.64  Fri Feb 21 01:17:26 
UTC 2020
   GCC version:
  ApportVersion: 2.20.11-0ubuntu27
  Architecture: amd64
  BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
  CasperMD5CheckResult: skip
  CompositorRunning: None
  CurrentDesktop: ubuntu:GNOME
  Date: Tue May 12 21:18:28 2020
  DistUpgraded: Fresh install
  DistroCodename: focal
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes
  GpuHangFrequency: This is the first time
  GraphicsCard:
   Intel Corporation UHD Graphics 620 [8086:5917] (rev 07) (prog-if 00 [VGA 
controller])
     Subsystem: Lenovo UHD Graphics 620 [17aa:225b]
     Subsystem: Lenovo GP108GLM [Quadro P500 Mobile] [17aa:225b]
  InstallationDate: Installed on 2020-04-25 (17 days ago)
  InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
  MachineType: LENOVO 20LB000KGE
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.4.0-29-generic 
root=UUID=4ba6b1d7-81de-4b61-b9df-0cd72af5d17e ro quiet splash vt.handoff=7
  SourcePackage: xorg
  Symptom: display
  Title: Xorg freeze
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 04/30/2019
  dmi.bios.vendor: LENOVO
  dmi.bios.version: N27ET35W (1.21 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20LB000KGE
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Defined
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: None
  dmi.modalias: 
dmi:bvnLENOVO:bvrN27ET35W(1.21):bd04/30/2019:svnLENOVO:pn20LB000KGE:pvrThinkPadP52s:rvnLENOVO:rn20LB000KGE:rvrNotDefined:cvnLENOVO:ct10:cvrNone:
  dmi.product.family: ThinkPad P52s
  dmi.product.name: 20LB000KGE
  dmi.product.sku: LENOVO_MT_20LB_BU_Think_FM_ThinkPad P52s
  dmi.product.version: ThinkPad P52s
  dmi.sys.vendor: LENOVO
  version.compiz: compiz N/A
  version.libdrm2: libdrm2 2.4.101-2
  version.libgl1-mesa-dri: libgl1-mesa-dri 20.0.4-2ubuntu1
  version.libgl1-mesa-glx: libgl1-mesa-glx N/A
  version.nvidia-graphics-drivers: nvidia-graphics-drivers-* N/A
  version.xserver-xorg-core: xserver-xorg-core 2:1.20.8-2ubuntu2
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.1.0-1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20200226-1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.16-1

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