Thank you for taking the time to report this bug and helping to make
Ubuntu better. It sounds like some part of the system has crashed. To
help us find the cause of the crash please follow these steps:

1. Look in /var/crash for crash files and if found run:
    ubuntu-bug YOURFILE.crash
Then tell us the ID of the newly-created bug.

2. If step 1 failed then look at https://errors.ubuntu.com/user/ID where
ID is the content of file /var/lib/whoopsie/whoopsie-id on the machine.
Do you find any links to recent problems on that page? If so then please
send the links to us.

3. If step 2 also failed then apply the workaround from bug 994921,
reboot, reproduce the crash, and retry step 1.

Please take care to avoid attaching .crash files to bugs as we are
unable to process them as file attachments. It would also be a security
risk for yourself.

Current LTS 20.04 Focal Fossa might be more stable for you.

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1877890

Title:
  System Hangs when trying to kill a Window

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  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)
  --- 
  ProblemType: Bug
  ApportVersion: 2.20.9-0ubuntu7.14
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  fkrauss    1808 F.... pulseaudio
   /dev/snd/controlC0:  fkrauss    1808 F.... pulseaudio
  CurrentDesktop: ubuntu:GNOME
  DistroRelease: Ubuntu 18.04
  InstallationDate: Installed on 2020-04-20 (20 days ago)
  InstallationMedia: Ubuntu 18.04.3 LTS "Bionic Beaver" - Release amd64 
(20190805)
  IwConfig:
   ens2      no wireless extensions.
   
   lo        no wireless extensions.
  Package: linux (not installed)
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 nouveaudrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.3.0-51-generic 
root=UUID=b52c713d-a2a9-4b17-8eed-79a031a415e8 ro quiet splash zswap.enabled=1 
zswap.compressor=lz4 crashkernel=512M-:192M vt.handoff=1 idle=nomwait
  ProcVersionSignature: Ubuntu 5.3.0-51.44~18.04.2-generic 5.3.18
  RelatedPackageVersions:
   linux-restricted-modules-5.3.0-51-generic N/A
   linux-backports-modules-5.3.0-51-generic  N/A
   linux-firmware                            1.173.17
  RfKill:
   
  Tags:  bionic
  Uname: Linux 5.3.0-51-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm audio cdrom dip lpadmin plugdev sambashare sudo video
  _MarkForUpload: True
  dmi.bios.date: 02/08/2010
  dmi.bios.vendor: Intel Corp.
  dmi.bios.version: PRG3110H.86A.0070.2010.0208.1351
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: DG31PR
  dmi.board.vendor: Intel Corporation
  dmi.board.version: AAD97573-306
  dmi.chassis.type: 3
  dmi.modalias: 
dmi:bvnIntelCorp.:bvrPRG3110H.86A.0070.2010.0208.1351:bd02/08/2010:svn:pn:pvr:rvnIntelCorporation:rnDG31PR:rvrAAD97573-306:cvn:ct3:cvr:

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