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Type: Bug
Resolution: Done
Priority: P3: Somewhat important
Fix Version/s: 5.12.3, 5.13.0, 5.14.0 Alpha
Affects Version/s: 5.9.7, 5.12.1
Component/s: WebEngine
Labels:
None
Environment:

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Windows, Qt-5.9.7, debug -> crash
Windows, Qt-5.9.7, release -> crash
Linux, Qt-5.9.7, debug -> crash
Linux, Qt-5.12.1, debug -> crash
Linux, Qt-5.12.1, release -> ok

Qt-binaries downloaded and installed from http://download.qt.io/official_releases/qt/

Show
Windows, Qt-5.9.7, debug -> crash Windows, Qt-5.9.7, release -> crash Linux, Qt-5.9.7, debug -> crash Linux, Qt-5.12.1, debug -> crash Linux, Qt-5.12.1, release -> ok Qt-binaries downloaded and installed from http://download.qt.io/official_releases/qt/

The application crashes when dynamic_casting eventFilter()'s first parameter 'QObject obj' to a QWidget. qobject_casting works.

The crash happens while eventFilter() is called with an obj originating from Qt5WebEngineCored, see attached screenshot.

A minimal application which reproduces the crash is attached.

PS: There is the class MessagePumpForUIQt which inherits QObject, but has no Q_OBJECT-Macro.

relates to

PYSIDE-819 QWebEngineView crashes Python process if ancestor widget processes key events