Public bug reported:

I am running Ubuntu 18.04 64 bit with Gnome III. Action to see bug:
1. double left mouse click on launcher icon on left toolbar (usually happens 
with Chromium Browser icon)
2. Desired result: Drop down menu appears with options to open Chromium browser 
3. Actual result when bug appears: Drop down menu appears then whole desktop 
freezes. No further mouseclicks on display work. Dropdown menu remains frozen 
on display.
4. Current workaround:
When bug appears, the  desktop can be unfrozen via cntl-alt-del keys but the 
drop-down menu remains frozen in place. Next, the frozen drop-down menu can now 
be closed by clicking on the "Activities" menu on the upper-left corner of the 
desktop and then clicking on the icon with the frozen drop-down menu. These 
actions close the frozen drop-down menu and restore normal operation of the 
Gnome III for a while until the bug pops up again. This bug has become 
especially common now rendering the desktop almost unusable and I'm thinking of 
replacing Gnome III due to this.
Thanks, Phil

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: xorg 1:7.7+19ubuntu7.1
ProcVersionSignature: Ubuntu 4.15.0-112.113-generic 4.15.18
Uname: Linux 4.15.0-112-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair nvidia_modeset 
nvidia
.proc.driver.nvidia.gpus.0000.82.00.0: Error: [Errno 21] Is a directory: 
'/proc/driver/nvidia/gpus/0000:82:00.0'
.proc.driver.nvidia.registry: Binary: ""
.proc.driver.nvidia.version:
 NVRM version: NVIDIA UNIX x86_64 Kernel Module  390.138  Thu May 14 01:01:53 
PDT 2020
 GCC version:  gcc version 7.5.0 (Ubuntu 7.5.0-3ubuntu1~18.04)
ApportVersion: 2.20.9-0ubuntu7.16
Architecture: amd64
BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: None
CurrentDesktop: ubuntu:GNOME
Date: Fri Aug  7 12:37:36 2020
DistUpgraded: Fresh install
DistroCodename: bionic
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes
GpuHangFrequency: Several times a week
GpuHangReproducibility: Seems to happen randomly
GpuHangStarted: Immediately after installing this version of Ubuntu
GraphicsCard:
 NVIDIA Corporation GM206 [GeForce GTX 950] [10de:1402] (rev a1) (prog-if 00 
[VGA controller])
   Subsystem: eVga.com. Corp. GM206 [GeForce GTX 950] [3842:2951]
InstallationDate: Installed on 2018-06-01 (798 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
MachineType: Supermicro X9DR3-F
ProcEnviron:
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-112-generic 
root=UUID=89151cf5-98dc-43fa-9046-917fe8211331 ro quiet splash vt.handoff=1
SourcePackage: xorg
Symptom: display
Title: Xorg freeze
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 07/31/2013
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 3.0a
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: X9DR3-F
dmi.board.vendor: Supermicro
dmi.board.version: 0123456789
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: Supermicro
dmi.chassis.version: 0123456789
dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr3.0a:bd07/31/2013:svnSupermicro:pnX9DR3-F:pvr0123456789:rvnSupermicro:rnX9DR3-F:rvr0123456789:cvnSupermicro:ct3:cvr0123456789:
dmi.product.family: To be filled by O.E.M.
dmi.product.name: X9DR3-F
dmi.product.version: 0123456789
dmi.sys.vendor: Supermicro
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.101-2~18.04.1
version.libgl1-mesa-dri: libgl1-mesa-dri 20.0.8-0ubuntu1~18.04.1
version.libgl1-mesa-glx: libgl1-mesa-glx 20.0.8-0ubuntu1~18.04.1
version.nvidia-graphics-drivers: nvidia-graphics-drivers-* N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.19.6-1ubuntu4.4
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:18.0.1-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20171229-1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.15-2

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


** Tags: amd64 apport-bug bionic freeze third-party-packages ubuntu

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https://bugs.launchpad.net/bugs/1890843

Title:
  Xorg freeze

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