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[Launchpad Bug Tracker <1853707@xxxxxxxxxxxxxxxxxx>]

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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

** Affects: librecad-dev
     Importance: Unknown
         Status: Unknown

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

** Affects: unity (Ubuntu)
     Importance: Undecided
         Status: Incomplete


** Tags: amd64 apport-bug compiz-0.9 third-party-packages ubuntu xenial
-- 
Whole system stopped responding because of single program's fault - no way out, had to force power off
https://bugs.launchpad.net/bugs/1853707
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