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Details

Type: Bug
Resolution: Done
Priority: P1: Critical
Fix Version/s: 6.5.0 Beta1
Affects Version/s: 5.15.9, 5.15.10
Component/s: WebEngine
Labels:
None
Environment:
Windows 7 x64 in VirtualBox
Windows 11 x64 on real hardware (Dell Precision 7760)
Visual Studio 2022 / MSVC 19.33.31629.0

Platform/s:

Windows
Commits:
db4d4d1eda (qt/qtwebengine/dev) bd949de2d3 (qt/qtwebengine/6.3) 135722510f (qt/qtwebengine/6.4) bd949de2d3 (qt/tqtc-qtwebengine/6.3) 135722510f (qt/tqtc-qtwebengine/6.4)

Description

In certain environments where only Software OpenGL is usable and ANGLE/Desktop OpenGL is not (e.g. Windows 7 in VirtualBox), or forcing it with the `QT_OPENGL` environment variable, WebEngine crashes during surface creation.

Repro:

1) Load the widget-based SimpleBrowser example in Creator

2) Configure the project for Qt 5.15.9

3) Add QT_OPENGL=software to the run environment

4) Run

Expected result: the default "www.qt.io" page loads, which is the case for 5.15.8.

Actual result: the page doesn't load, stays empty, the application log contains OpenGL errors:

12:20:15: Starting C:/git/Qt/Examples/Qt-5.15.10/webenginewidgets/build-simplebrowser-Desktop_Qt_5_15_9_MSVC2019_64bit-Release/release/simplebrowser.exe...

qt.qpa.backingstore: composeAndFlush: makeCurrent() failed
[23216:25412:0831/122015.828:ERROR:gl_context_wgl.cc(78)] Could not share GL contexts.
[23216:25412:0831/122015.835:ERROR:gpu_channel_manager.cc(753)] ContextResult::kFatalFailure: Failed to create shared context for virtualization.
[23216:25412:0831/122015.835:ERROR:shared_image_stub.cc(470)] SharedImageStub: unable to create context
[23216:25412:0831/122015.835:ERROR:gpu_channel.cc(449)] GpuChannel: Failed to create SharedImageStub
[23216:25412:0831/122015.843:ERROR:gl_context_wgl.cc(78)] Could not share GL contexts.

<these lines keep repeating forever>

The opengl32sw.dll is the one that ships with Qt 5.15.9 in the msvc2019_x64 package.