[Bug 1877890] [NEW] System Hangs when trying to kill a Window

[Launchpad Bug Tracker]

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Dear Sirs,
I'm a long term user of Ubuntu,
I run a Client/Server system that my clients expect to be very stable.
I ran under Trust Tahr for a long while with great success and no Hangups at all.
I recently upgraded to Bionic Beaver and I find that I have a number of
Hangups.
They seem to occur mostly when switching between different users.
The latest one that occurred last night that I want to show you here was
caused by something else.
I was watching a video from Youtube under Firefox.
At the end of it I clicked the upper right hand button of the window
to kill the screen. At this point the system froze on me.
I could move the mouse around but none of the keys worked.
I used the SysrRq - Magic Key combination to get the following information
ALT + PrtScrn, ALT + CREISUB
The system re-booted and gave me the following files in /var/crash
  4096 May  9 23:38 202005092338
   349 May 10 11:01 kexec_cmd
 25387 May  9 23:39 linux-image-5.3.0-51-generic-202005092338.crash

     69696 May  9 23:38 dmesg.202005092338
 291014103 May  9 23:38 dump.202005092338

I used the crash program with the Symbols file and in the backtrace section
   under the exception line it says:
           exception RIP mwait_idle+132
   in the disassembly of mwait_idle
    the line at +132 is
          mov    %gs:0x72774cb4(%rip),%r12d        # 0x10350

Any information that I can supply to you I will be glad to in order to
aid you in solving this problem.

I'm fairly computer literate and so I can follow any directions that
you want to give to me.

I have enjoyed using Ubutnu for many years but I do need a Stable
environment for my Development work and for my users satisfaction.

Yours truly,
Frank Krauss

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.37
ProcVersionSignature: Ubuntu 5.3.0-51.44~18.04.2-generic 5.3.18
Uname: Linux 5.3.0-51-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.14
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: ubuntu:GNOME
Date: Sun May 10 13:19:54 2020
InstallationDate: Installed on 2020-04-20 (19 days ago)
InstallationMedia: Ubuntu 18.04.3 LTS "Bionic Beaver" - Release amd64 (20190805)
PackageArchitecture: all
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: ubuntu-release-upgrader
Symptom: release-upgrade
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug bionic dist-upgrade
-- 
System Hangs when trying to kill a Window
https://bugs.launchpad.net/bugs/1877890
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