Which GUI are you using that exhibits the problem?

** Summary changed:

- Xorg freeze on high disk or cpu load or random
+ GUI freeze on high disk or CPU load, but disabling swap fixes it

** Package changed: xorg (Ubuntu) => linux (Ubuntu)

** Changed in: linux (Ubuntu)
       Status: Confirmed => Incomplete

** Summary changed:

- GUI freeze on high disk or CPU load, but disabling swap fixes it
+ GUI freeze on high disk IO, but disabling swap fixes it

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https://bugs.launchpad.net/bugs/1852001

Title:
  GUI freeze on high disk IO, but disabling swap fixes it

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  I've got massive problems with GUI on my PC.

  The attached logs are from the following setting: 
  - high disk load (f3write)
  - kernel 4.15.0-1050-oem (the only 4x kernel available in eoan)
  - no swap available

  These are the parameters (disk load, kernel, swap) I am fiddling with
  to find out the cause, see below.

  In general 
  - the problem happens once a day with any 5.0 or 5.3 kernel from eoan repo
  - more likely to happen with high disk or CPU load, but not necessarily.
  - less likely with the 4.x kernel mentioned above. 

  I just installed the following kernels from kernel-ppa:
  5.3.10-050310-generic 
  5.4.0-050400rc6-generic
  5.4.0-997-generic (drm-intel-next)
  Now I am waiting for the freeze to occur again. 

  The problem started about half a year ago. 
  There have been three changes that happened at the time and could be the cause
  - switch to kernel 5.x
  - update to Ubuntu 19.4
  - swapped motherboard, CPU and RAM. 

  The hassle started with the following scenario, repeated often: 
  - high disk load
  - PC becomes laggy
  - soon dies/freezes

  The longer I waited, the deeper the lockdown went. but I don't know the exact 
details. 
  The first cause I found was kswapd running amok and take the system with it. 
Workaround: add swap space. 

  Now the problem shifted: Whenever I got high disk load (eg dd 100 GB
  of data) the kernel swaps likle crazy and makes the GUI first lag soon
  freeze. but no excessive CPU load any more, as kswapd does not go
  crazy.

  Again I found a workaround: 
  the above mentioned 4.x kernel. In this case the GUI lags as expected from a 
heavily swapping system. nothing more. 
  but still sometimes the GUI simply freezes (the error reported at the top)

  Another workaround is to completely remove swap. Let's see what
  happens, if kswapd goes amok again.

  I am not sure as how these problems are related.

  I did extensive hardware check like
  - memtest86 newest version, no "may be vulnerable to high frequency row 
hammering"
  - smart

  do you suggest any burn in test suites?

  thanks

  ProblemType: Bug
  DistroRelease: Ubuntu 19.10
  Package: xorg 1:7.7+19ubuntu12
  ProcVersionSignature: Ubuntu 4.15.0-1050.57-oem 4.15.18
  Uname: Linux 4.15.0-1050-oem x86_64
  ApportVersion: 2.20.11-0ubuntu8.2
  Architecture: amd64
  Date: Sun Nov 10 15:55:14 2019
  DistUpgraded: 2019-10-19 13:35:30,394 DEBUG entry '# deb 
http://ppa.launchpad.net/brandonsnider/cdrtools/ubuntu cosmic main # disabled 
on upgrade to eoan' was disabled (unknown mirror)
  DistroCodename: eoan
  DistroVariant: ubuntu
  DkmsStatus:
   virtualbox, 6.0.14, 5.3.0-18-generic, x86_64: installed
   virtualbox, 6.0.14, 5.3.0-19-generic, x86_64: installed
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   Intel Corporation UHD Graphics 630 (Desktop 9 Series) [8086:3e98] (prog-if 
00 [VGA controller])
     Subsystem: Micro-Star International Co., Ltd. [MSI] UHD Graphics 630 
(Desktop 9 Series) [1462:7b16]
  InstallationDate: Installed on 2017-12-16 (693 days ago)
  InstallationMedia: Kubuntu 17.10 "Artful Aardvark" - Release amd64 
(20171017.1)
  MachineType: Micro-Star International Co., Ltd. MS-7B16
  ProcEnviron:
   LANGUAGE=en_US:en
   TERM=linux
   PATH=(custom, no user)
   LANG=de_DE.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-1050-oem 
root=UUID=ca93bfbd-335a-4cc7-9d0f-f0da18447497 ro quiet splash vt.handoff=7
  SourcePackage: xorg
  Symptom: display
  Title: Xorg freeze
  UpgradeStatus: Upgraded to eoan on 2019-10-19 (22 days ago)
  dmi.bios.date: 08/13/2019
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 2.80
  dmi.board.asset.tag: Default string
  dmi.board.name: B360 GAMING PRO CARBON (MS-7B16)
  dmi.board.vendor: Micro-Star International Co., Ltd.
  dmi.board.version: 1.0
  dmi.chassis.asset.tag: Default string
  dmi.chassis.type: 3
  dmi.chassis.vendor: Micro-Star International Co., Ltd.
  dmi.chassis.version: 1.0
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr2.80:bd08/13/2019:svnMicro-StarInternationalCo.,Ltd.:pnMS-7B16:pvr1.0:rvnMicro-StarInternationalCo.,Ltd.:rnB360GAMINGPROCARBON(MS-7B16):rvr1.0:cvnMicro-StarInternationalCo.,Ltd.:ct3:cvr1.0:
  dmi.product.family: Default string
  dmi.product.name: MS-7B16
  dmi.product.version: 1.0
  dmi.sys.vendor: Micro-Star International Co., Ltd.
  version.compiz: compiz N/A
  version.libdrm2: libdrm2 2.4.99-1ubuntu1
  version.libgl1-mesa-dri: libgl1-mesa-dri 19.2.1-1ubuntu1
  version.libgl1-mesa-glx: libgl1-mesa-glx 19.2.1-1ubuntu1
  version.xserver-xorg-core: xserver-xorg-core 2:1.20.5+git20191008-0ubuntu1
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.0.1-1ubuntu1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel N/A
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.16-1

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