We do rely on bug reporters to help with triaging the bugs they open.
This is mostly because we do not have infinite resources to try and
reproduce everyone's bugs ourselves. And doing so would be unreliable
anyway, as we might hit slightly different issues and mistake them for
the original issue. We have hundreds of bug reports to deal with each
week -- there is not enough time to replicate them all.

Please follow the instructions in comment #2 as that will get this
closer to a resolution.

** Changed in: compiz (Ubuntu)
       Status: New => Incomplete

** Changed in: nvidia-graphics-drivers-340 (Ubuntu)
       Status: New => Incomplete

** Changed in: unity (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1853707

Title:
  Whole system stopped responding because of single program's fault - no
  way out, had to force power off

Status in compiz package in Ubuntu:
  Incomplete
Status in nvidia-graphics-drivers-340 package in Ubuntu:
  Incomplete
Status in unity package in Ubuntu:
  Incomplete

Bug description:
  What I did was:

  - install LibreCAD (by adding their ppa and then using apt-get)
  - open it
  - try to open the attached .dwf file

  LibreCAD hanged and the whole system stopped responding. The mouse
  button stopped moving, the system wouldn't respond to keyboard
  strokes, AND not even Ctrl+Alt+F1 worked to open a virtual terminal
  where I could have tried killing some process.

  Obviously there's a bug in LibreCAD, but no matter how badly a buggy
  (or even evil) process behaves, if a single misbehaving program can
  cause the whole OS to stall in a way that you cannot recover from,
  then by definition there's a bug in the OS.

  You must ALWAYS be able to kill the offending program and resume
  normal operation without having to stop one single application other
  than the offending one.

  I have no idea whether the bug is actually in Xorg or somewhere else;
  the reason I'm reporting it against xorg is that ctrl+alt+F1 wouldn't
  work. I might very well be wrong but I believe xorg is responsible for
  providing the virtual terminal via ctrl+alt+f1?

  Either way, that MUST ALWAYS be available no matter how badly things
  go.

  That a single program hanging causes me to have to force-power down
  the computer is outrageous.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: xorg 1:7.7+13ubuntu3.1
  ProcVersionSignature: Ubuntu 4.4.0-169.198-generic 4.4.197
  Uname: Linux 4.4.0-169-generic x86_64
  NonfreeKernelModules: nvidia_uvm nvidia
  .proc.driver.nvidia.gpus.0000.01.00.0: Error: [Errno 21] Is a directory: 
'/proc/driver/nvidia/gpus/0000:01:00.0'
  .proc.driver.nvidia.registry: Binary: ""
  .proc.driver.nvidia.version:
   NVRM version: NVIDIA UNIX x86_64 Kernel Module  340.107  Thu May 24 21:54:01 
PDT 2018
   GCC version:  gcc version 5.4.0 20160609 (Ubuntu 5.4.0-6ubuntu1~16.04.12)
  .tmp.unity_support_test.0:
   
  ApportVersion: 2.20.1-0ubuntu2.21
  Architecture: amd64
  CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: compiz
  CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
  CompositorUnredirectFSW: true
  CurrentDesktop: Unity
  Date: Sat Nov 23 17:27:22 2019
  DistUpgraded: Fresh install
  DistroCodename: xenial
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes, if not too technical
  GraphicsCard:
   Intel Corporation 3rd Gen Core processor Graphics Controller [8086:0166] 
(rev 09) (prog-if 00 [VGA controller])
     Subsystem: Acer Incorporated [ALI] 3rd Gen Core processor Graphics 
Controller [1025:0647]
   NVIDIA Corporation GF117M [GeForce 610M/710M/810M/820M / GT 
620M/625M/630M/720M] [10de:1140] (rev a1) (prog-if 00 [VGA controller])
     Subsystem: Acer Incorporated [ALI] GeForce 710M [1025:0691]
  InstallationDate: Installed on 2013-10-11 (2233 days ago)
  InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
  MachineType: Acer Aspire V3-571G
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-169-generic 
root=UUID=5830b30e-69e8-4bb4-8a2b-bc2b43c7414a ro quiet splash vt.handoff=7
  SourcePackage: xorg
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 10/15/2012
  dmi.bios.vendor: Acer
  dmi.bios.version: V2.07
  dmi.board.asset.tag: Type2 - Board Asset Tag
  dmi.board.name: VA50_HC_CR
  dmi.board.vendor: Acer
  dmi.board.version: Type2 - Board Version
  dmi.chassis.type: 10
  dmi.chassis.vendor: Acer
  dmi.chassis.version: V2.07
  dmi.modalias: 
dmi:bvnAcer:bvrV2.07:bd10/15/2012:svnAcer:pnAspireV3-571G:pvrV2.07:rvnAcer:rnVA50_HC_CR:rvrType2-BoardVersion:cvnAcer:ct10:cvrV2.07:
  dmi.product.name: Aspire V3-571G
  dmi.product.version: V2.07
  dmi.sys.vendor: Acer
  version.compiz: compiz 1:0.9.12.3+16.04.20180221-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.91-2~16.04.1
  version.libgl1-mesa-dri: libgl1-mesa-dri 18.0.5-0ubuntu0~16.04.1
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 18.0.5-0ubuntu0~16.04.1
  version.nvidia-graphics-drivers: nvidia-graphics-drivers-* N/A
  version.xserver-xorg-core: xserver-xorg-core 2:1.18.4-0ubuntu0.8
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.1-1ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.7.0-1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20160325-1ubuntu1.2
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 
1:1.0.12-1build2
  xserver.bootTime: Sat Nov 23 17:25:58 2019
  xserver.configfile: /etc/X11/xorg.conf
  xserver.errors:
   NVIDIA(0): Failed to initiate mode change.
   NVIDIA(0): Failed to complete mode change
  xserver.logfile: /var/log/Xorg.0.log
  xserver.version: 2:1.18.4-0ubuntu0.8

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