Crash using OpenGL widget

[zyrkiel]

Hello,

I am facing a different issues when handling OpenGL widgets inside the ads::CDockWidget.
I have been able to reproduce a crash with a light example: https://github.com/zyrkiel/Qt-Advanced-Docking-System/tree/Add-OpenGl-example

Screencast.from.2025-02-20.12-16-59.mp4

What I try to do, in this example, is to undock then dock my ads::CDockWidget that handles an OpenGL widget (here a chart with an GPU accelerated series). In that case, the MainWindow crashes when docking back the CDockWidget.
(In my project, I am using QVTKOpenGLStereoWidget that creates a different situation where the CDockWidget disappears if it is undocked from the area it has been added to)

Here is the callstack:

libQt6Core.so.6!QMetaObject::cast(const QMetaObject * const this, const QObject * obj) (/home/tgeffroy/GitRepo/git/vcpkg/buildtrees/qtbase/src/here-src-6-ac50939fe7.clean/src/corelib/kernel/qmetaobject.cpp:395)
libQt6Widgets.so.6!QMetaObject::cast(const QMetaObject * const this, QObject * obj) (/home/tgeffroy/GitRepo/git/vcpkg/buildtrees/qtbase/src/here-src-6-ac50939fe7.clean/src/corelib/kernel/qobjectdefs.h:241)
libQt6Widgets.so.6!qobject_cast<QWidgetWindow*>(QObject * object) (/home/tgeffroy/GitRepo/git/vcpkg/buildtrees/qtbase/src/here-src-6-ac50939fe7.clean/src/corelib/kernel/qobject.h:419)
libQt6Widgets.so.6!QApplicationPrivate::notifyActiveWindowChange(QApplicationPrivate * const this, QWindow * previous) (/home/tgeffroy/GitRepo/git/vcpkg/buildtrees/qtbase/src/here-src-6-ac50939fe7.clean/src/widgets/kernel/qapplication.cpp:1935)
libQt6Gui.so.6!QGuiApplicationPrivate::processFocusWindowEvent(QWindowSystemInterfacePrivate::FocusWindowEvent * e) (/home/tgeffroy/GitRepo/git/vcpkg/buildtrees/qtbase/src/here-src-6-ac50939fe7.clean/src/gui/kernel/qguiapplication.cpp:2566)
libQt6Gui.so.6!QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent * e) (/home/tgeffroy/GitRepo/git/vcpkg/buildtrees/qtbase/src/here-src-6-ac50939fe7.clean/src/gui/kernel/qguiapplication.cpp:2092)
libQt6Gui.so.6!QWindowSystemInterface::sendWindowSystemEvents(QEventLoop::ProcessEventsFlags flags) (/home/tgeffroy/GitRepo/git/vcpkg/buildtrees/qtbase/src/here-src-6-ac50939fe7.clean/src/gui/kernel/qwindowsysteminterface.cpp:1114)
libQt6XcbQpa.so.6!QXcbUnixEventDispatcher::processEvents(QXcbUnixEventDispatcher * const this, QEventLoop::ProcessEventsFlags flags) (/home/tgeffroy/GitRepo/git/vcpkg/buildtrees/qtbase/src/here-src-6-ac50939fe7.clean/src/plugins/platforms/xcb/qxcbeventdispatcher.cpp:27)
libQt6Core.so.6!QEventLoop::processEvents(QEventLoop * const this, QEventLoop::ProcessEventsFlags flags) (/home/tgeffroy/GitRepo/git/vcpkg/buildtrees/qtbase/src/here-src-6-ac50939fe7.clean/src/corelib/kernel/qeventloop.cpp:100)
libQt6Core.so.6!QEventLoop::exec(QEventLoop * const this, QEventLoop::ProcessEventsFlags flags) (/home/tgeffroy/GitRepo/git/vcpkg/buildtrees/qtbase/src/here-src-6-ac50939fe7.clean/src/corelib/kernel/qeventloop.cpp:182)
libQt6Core.so.6!QCoreApplication::exec() (/home/tgeffroy/GitRepo/git/vcpkg/buildtrees/qtbase/src/here-src-6-ac50939fe7.clean/src/corelib/kernel/qcoreapplication.cpp:1486)
libQt6Gui.so.6!QGuiApplication::exec() (/home/tgeffroy/GitRepo/git/vcpkg/buildtrees/qtbase/src/here-src-6-ac50939fe7.clean/src/gui/kernel/qguiapplication.cpp:1926)
libQt6Widgets.so.6!QApplication::exec() (/home/tgeffroy/GitRepo/git/vcpkg/buildtrees/qtbase/src/here-src-6-ac50939fe7.clean/src/widgets/kernel/qapplication.cpp:2555)
main(int argc, char ** argv) (/home/tgeffroy/GitRepo/git/Qt-Advanced-Docking-System/examples/openGL/main.cpp:16)

---

My config is:
Qt: 6.7.2 (through vcpkg official ports but it should not matter)
ADS: 4.4.0
OS: Ubuntu 24.04
Debug & Release

[zyrkiel]

I have done a similar test by replacing the ads::CDockWidget by a QDockWidget. In that case, undocking and docking the dock widget containing the OpenGL chart doesn't meet the issue.

[zyrkiel]

A colleague has tested it on Windows and cannot reproduce what happens on Ubuntu...