https://bugs.kde.org/show_bug.cgi?id=419415

            Bug ID: 419415
           Summary: Frequently freezes up suddenly, sometimes crashes,
                    with no apparent cause.
           Product: krita
           Version: 4.2.9
          Platform: Other
                OS: macOS
            Status: REPORTED
          Severity: crash
          Priority: NOR
         Component: General
          Assignee: krita-bugs-n...@kde.org
          Reporter: b.32.whitefa...@gmail.com
  Target Milestone: ---

SUMMARY
Frequently during drawing, krita freezes up. Occasionally it returns to normal,
but only to freeze again later. Eventually the program crashes, or stays stuck
in a permanent freeze where I can't click anything on my laptop and have to
switch it off and restart.

STEPS TO REPRODUCE
1. Start drawing. I was drawing over an image, but it was a very small sized
one, so it certainly didn't take up too much memory.
2. The onscreen cursor stops working and freezes in place.
3. It might start being movable again after a bit, or the cursor might change
to a constant loading symbol. Crashes are possible at any time throughout this.

OBSERVED RESULT
Program is difficult to use, and loses work if you don't deliberately save
every minute. Sometimes my whole computer freezes up and the fan starts working
overtime. My computer doesn't freeze up when using any other application.

EXPECTED RESULT
For the program to not freeze up and/or crash.

SOFTWARE/OS VERSIONS
macOS: 10.14.6

ADDITIONAL INFORMATION
Below is the krita log for my most recent uses of the program.

SESSION: 29 Mar 2020 18:39:44 +0800. Executing
/Applications/krita.app/Contents/MacOS/krita

Krita

 Version: 4.2.5
 Languages: en_AU
 Hidpi: true

Qt

  Version (compiled): 5.12.3
  Version (loaded): 5.12.3

OS Information

  Build ABI: x86_64-little_endian-lp64
  Build CPU: x86_64
  CPU: x86_64
  Kernel Type: darwin
  Kernel Version: 18.7.0
  Pretty Productname: macOS Mojave (10.14)
  Product Type: osx
  Product Version: 10.14


Hardware Information

  GPU Acceleration: auto
  Memory: 4096 Mb
  Number of Cores: 4
  Swap Location: /Users/TabithaCatDeeks/Library/Application Support/krita/swap

29 Mar 2020 18:45:07 +0800: Closing.

KRITA DID NOT CLOSE CORRECTLY
================================================================================
SESSION: 29 Mar 2020 19:52:22 +0800. Executing
/Applications/krita.app/Contents/MacOS/krita

Krita Version: 4.2.9, Qt version compiled: 5.12.7, loaded: 5.12.7. Process ID:
1413
-- -- -- -- -- -- -- --
29 Mar 2020 19:52:46 +0800: CLOSING SESSION
================================================================================
SESSION: 30 Mar 2020 20:33:24 +0800. Executing
/Applications/krita.app/Contents/MacOS/krita

Krita Version: 4.2.9, Qt version compiled: 5.12.7, loaded: 5.12.7. Process ID:
2182
-- -- -- -- -- -- -- --

KRITA DID NOT CLOSE CORRECTLY
================================================================================
SESSION: 30 Mar 2020 20:33:32 +0800. Executing
/Applications/krita.app/Contents/MacOS/krita

Krita Version: 4.2.9, Qt version compiled: 5.12.7, loaded: 5.12.7. Process ID:
2191
-- -- -- -- -- -- -- --
30 Mar 2020 20:33:49 +0800: Importing application/x-krita to
application/x-krita. Location: /Users/TabithaCatDeeks/Downloads/rantlebone.kra.
Real location: /Users/TabithaCatDeeks/Downloads/rantlebone.kra. Batchmode: 0
30 Mar 2020 20:33:49 +0800: Loaded image from application/x-krita. Size: 562 *
592 pixels, 4.16667 dpi. Color model: 8-bit integer/channel RGB/Alpha
(sRGB-elle-V2-srgbtrc.icc). Layers: 4
30 Mar 2020 20:35:50 +0800: Saving Document
/Users/TabithaCatDeeks/Downloads/rantlebone.kra as
/Users/TabithaCatDeeks/Downloads/rantlebone.kra (mime: application/x-krita).
562 * 592 pixels, 4 layers.  101 frames, 24 framerate. Export configuration: No
configuration
30 Mar 2020 20:35:50 +0800: Create a simple backup for
/Users/TabithaCatDeeks/Downloads/rantlebone.kra in the same location as the
file.
30 Mar 2020 20:35:50 +0800: Converting from application/x-krita to
application/x-krita. Location: /Users/TabithaCatDeeks/Downloads/rantlebone.kra.
Real location: /Users/TabithaCatDeeks/Downloads/rantlebone.kra. Batchmode: 0.
Configuration: none
30 Mar 2020 20:35:51 +0800: Completed saving
/Users/TabithaCatDeeks/Downloads/rantlebone.kra (mime: application/x-krita).
Result: OK. Size: 2157788. MD5 Hash: 6a65ab64b5ac802e401c166af58a6940
30 Mar 2020 20:35:51 +0800: Saving Completed
30 Mar 2020 20:38:15 +0800: Saving Document
/Users/TabithaCatDeeks/Downloads/rantlebone.kra as
/Users/TabithaCatDeeks/Downloads/rantlebone.kra (mime: application/x-krita).
562 * 592 pixels, 4 layers.  101 frames, 24 framerate. Export configuration: No
configuration
30 Mar 2020 20:38:15 +0800: Create a simple backup for
/Users/TabithaCatDeeks/Downloads/rantlebone.kra in the same location as the
file.
30 Mar 2020 20:38:15 +0800: Converting from application/x-krita to
application/x-krita. Location: /Users/TabithaCatDeeks/Downloads/rantlebone.kra.
Real location: /Users/TabithaCatDeeks/Downloads/rantlebone.kra. Batchmode: 0.
Configuration: none
30 Mar 2020 20:38:16 +0800: Completed saving
/Users/TabithaCatDeeks/Downloads/rantlebone.kra (mime: application/x-krita).
Result: OK. Size: 2161588. MD5 Hash: 52e88203a8be526ca2398b86a28f494a
30 Mar 2020 20:38:16 +0800: Saving Completed
30 Mar 2020 20:38:31 +0800: Saving Document
/Users/TabithaCatDeeks/Downloads/rantlebone.kra as
/Users/TabithaCatDeeks/Downloads/rantlebone.kra (mime: application/x-krita).
562 * 592 pixels, 4 layers.  101 frames, 24 framerate. Export configuration: No
configuration
30 Mar 2020 20:38:31 +0800: Create a simple backup for
/Users/TabithaCatDeeks/Downloads/rantlebone.kra in the same location as the
file.
30 Mar 2020 20:38:31 +0800: Converting from application/x-krita to
application/x-krita. Location: /Users/TabithaCatDeeks/Downloads/rantlebone.kra.
Real location: /Users/TabithaCatDeeks/Downloads/rantlebone.kra. Batchmode: 0.
Configuration: none
30 Mar 2020 20:38:32 +0800: Completed saving
/Users/TabithaCatDeeks/Downloads/rantlebone.kra (mime: application/x-krita).
Result: OK. Size: 2161588. MD5 Hash: 4904164ba7095cd1a8aea34c2e6b4759
30 Mar 2020 20:38:32 +0800: Saving Completed

KRITA DID NOT CLOSE CORRECTLY


And here is my system/OS information:

Krita

 Version: 4.2.9
 Languages: 
 Hidpi: true

Qt

  Version (compiled): 5.12.7
  Version (loaded): 5.12.7

OS Information

  Build ABI: x86_64-little_endian-lp64
  Build CPU: x86_64
  CPU: x86_64
  Kernel Type: darwin
  Kernel Version: 18.7.0
  Pretty Productname: macOS Mojave (10.14)
  Product Type: osx
  Product Version: 10.14

OpenGL Info

  Vendor:  "Intel Inc." 
  Renderer:  "Intel(R) HD Graphics 6000" 
  Version:  "4.1 INTEL-12.10.17" 
  Shading language:  "4.10" 
  Requested format:  QSurfaceFormat(version 3.2, options
QFlags<QSurfaceFormat::FormatOption>(), depthBufferSize 24, redBufferSize 8,
greenBufferSize 8, blueBufferSize 8, alphaBufferSize 8, stencilBufferSize 8,
samples -1, swapBehavior QSurfaceFormat::DoubleBuffer, swapInterval 0,
colorSpace QSurfaceFormat::DefaultColorSpace, profile 
QSurfaceFormat::CoreProfile) 
  Current format:    QSurfaceFormat(version 4.1, options
QFlags<QSurfaceFormat::FormatOption>(), depthBufferSize 24, redBufferSize 8,
greenBufferSize 8, blueBufferSize 8, alphaBufferSize 8, stencilBufferSize 8,
samples 0, swapBehavior QSurfaceFormat::DoubleBuffer, swapInterval 0,
colorSpace QSurfaceFormat::DefaultColorSpace, profile 
QSurfaceFormat::CoreProfile) 
     Version: 4.1
     Supports deprecated functions false 
     is OpenGL ES: false 

QPA OpenGL Detection Info 
  supportsDesktopGL: true 
  supportsOpenGLES: false 
  isQtPreferOpenGLES: false 

Hardware Information

  GPU Acceleration: auto
  Memory: 4096 Mb
  Number of Cores: 4
  Swap Location: /Users/TabithaCatDeeks/Library/Application Support/krita/swap

Current Settings

  Current Swap Location: /Users/TabithaCatDeeks/Library/Application
Support/krita/swap
  Undo Enabled: 1
  Undo Stack Limit: 30
  Use OpenGL: 1
  Use OpenGL Texture Buffer: 1
  Use AMD Vectorization Workaround: 0
  Canvas State: OPENGL_SUCCESS
  Autosave Interval: 900
  Use Backup Files: 1
  Number of Backups Kept: 1
  Backup File Suffix: ~
  Backup Location: Same Folder as the File
  Use Win8 Pointer Input: 0
  Use RightMiddleTabletButton Workaround: 0
  Levels of Detail Enabled: 0
  Use Zip64: 0


Display Information
Number of screens: 1
        Screen: 0
                Name: Color LCD
                Depth: 24
                Scale: 1
                Resolution in pixels: 1366x768
                Manufacturer: 
                Model: 
                Refresh Rate: 60

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