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Bug
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Resolution: Unresolved
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P2: Important
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None
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6.10.0
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None
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Linux/Wayland
Running the attached program causes QDialog::exec() to return early and the program to exit. It seems to come from the fact that when the QQuickWidget is created on a delay, it forces the dialog window to be destroyed and created with a new RSI config. This happens around qwidget.cpp:10938:
if (existingSurfaceType != surfaceType) {
qCDebug(lcWidgetPainting)
<< "Recreating" << existingWindow
<< "with current type" << existingSurfaceType
<< "to support" << surfaceType;
const auto windowStateBeforeDestroy = newParentWithWindow->windowState();
const auto visibilityBeforeDestroy = newParentWithWindow->isVisible();
const auto positionBeforeDestroy = newParentWithWindow->pos();
newParentWithWindow->destroy();
newParentWithWindow->create();
Using QDialog::open() instead gets around the problem:
int main(int argc, char **argv) { QApplication app{argc, argv}; Dialog dlg; dlg.open(); QObject::connect(&dlg, &QDialog::finished, [](int i) { qDebug() << "Result:" << i; }); return app.exec(); }
This would probably be a suitable workaround for the linked issues as well.
Backtrace:
* thread #1, name = 'main', stop reason = breakpoint 1.1 * frame #0: 0x00007fffd1733f31 libQt6Widgets.so.6`QWidget::setParent(this=0x00005555557f4350, parent=0x00007fffffffdeb0, f=Qt::WindowFlags @ 0x00007fffffffc938) at qwidget.cpp:10938:21 frame #1: 0x00007fffd1731f0a libQt6Widgets.so.6`QWidgetPrivate::init(this=0x000055555573c0e0, parentWidget=0x00007fffffffdeb0, f=Qt::WindowFlags @ 0x00007fffffffca64) at qwidget.cpp:985:12 frame #2: 0x00007fffd1731b26 libQt6Widgets.so.6`QWidget::QWidget(this=0x00005555557f4350, dd=0x000055555573c0e0, parent=0x00007fffffffdeb0, f=Qt::WindowFlags @ 0x00007fffffffcac4) at qwidget.cpp:864:12 frame #3: 0x00007ffff7f91a0b libQt6QuickWidgets.so.6`QQuickWidget::QQuickWidget(this=0x00005555557f4350, parent=0x00007fffffffdeb0) at qquickwidget.cpp:657:7 frame #4: 0x0000555555557afc main`Dialog::showEvent(QShowEvent*)::'lambda'()::operator()() const + 58 frame #5: 0x0000555555558125 main`QtPrivate::FunctorCall<std::integer_sequence<unsigned long>, QtPrivate::List<>, void, Dialog::showEvent(QShowEvent*)::'lambda'()>::call(Dialog::showEvent(QShowEvent*)::'lambda'()&, void**)::'lambda'()::operator()() const + 31 frame #6: 0x00005555555581ad main`void QtPrivate::FunctorCallBase::call_internal<void, QtPrivate::FunctorCall<std::integer_sequence<unsigned long>, QtPrivate::List<>, void, Dialog::showEvent(QShowEvent*)::'lambda'()>::call(Dialog::showEvent(QShowEvent*)::'lambda'()&, void**)::'lambda'()>(void**, QtPrivate::FunctorCall<std::integer_sequence<unsigned long>, QtPrivate::List<>, void, Dialog::showEvent(QShowEvent*)::'lambda'()>::call(Dialog::showEvent(QShowEvent*)::'lambda'()&, void**)::'lambda'()&&) + 40 frame #7: 0x000055555555816e main`QtPrivate::FunctorCall<std::integer_sequence<unsigned long>, QtPrivate::List<>, void, Dialog::showEvent(QShowEvent*)::'lambda'()>::call(Dialog::showEvent(QShowEvent*)::'lambda'()&, void**) + 70 frame #8: 0x0000555555558103 main`void QtPrivate::FunctorCallable<Dialog::showEvent(QShowEvent*)::'lambda'()>::call<QtPrivate::List<>, void>(Dialog::showEvent(QShowEvent*)::'lambda'()&, void*, void**) + 43 frame #9: 0x00005555555580bb main`QtPrivate::QCallableObject<Dialog::showEvent(QShowEvent*)::'lambda'(), QtPrivate::List<>, void>::impl(int, QtPrivate::QSlotObjectBase*, QObject*, void**, bool*) + 124 frame #10: 0x00007fffd0a30602 libQt6Core.so.6`QtPrivate::QSlotObjectBase::call(this=0x0000555555796e70, r=0x00005555555878b0, a=0x00005555557e9138) at qobjectdefs_impl.h:461:51 frame #11: 0x00007fffd0c1ce7c libQt6Core.so.6`QMetaCallEvent::placeMetaCall(this=0x00005555557e90f0, object=0x00005555555878b0) at qobject.cpp:621:21 frame #12: 0x00007fffd0c1e9e1 libQt6Core.so.6`QObject::event(this=0x00005555555878b0, e=0x00005555557e90f0) at qobject.cpp:1411:18 frame #13: 0x00007fffd0d89aa6 libQt6Core.so.6`QThread::event(this=0x00005555555878b0, event=0x00005555557e90f0) at qthread.cpp:1273:25 frame #14: 0x00007fffd16a33e0 libQt6Widgets.so.6`QApplicationPrivate::notify_helper(this=0x0000555555587630, receiver=0x00005555555878b0, e=0x00005555557e90f0) at qapplication.cpp:3307:26 frame #15: 0x00007fffd16a72bc libQt6Widgets.so.6`QApplication::notify(this=0x00007fffffffde80, receiver=0x00005555555878b0, e=0x00005555557e90f0) at qapplication.cpp:3257:18 frame #16: 0x00007fffd0b6e4a9 libQt6Core.so.6`QCoreApplication::notifyInternal2(receiver=0x00005555555878b0, event=0x00005555557e90f0) at qcoreapplication.cpp:1109:18 frame #17: 0x00007fffd0b6f119 libQt6Core.so.6`QCoreApplication::sendEvent(receiver=0x00005555555878b0, event=0x00005555557e90f0) at qcoreapplication.cpp:1549:12 frame #18: 0x00007fffd0b7004a libQt6Core.so.6`QCoreApplicationPrivate::sendPostedEvents(receiver=0x0000000000000000, event_type=0, data=0x0000555555587810) at qcoreapplication.cpp:1893:9 frame #19: 0x00007fffd0b6ef5c libQt6Core.so.6`QCoreApplication::sendPostedEvents(receiver=0x0000000000000000, event_type=0) at qcoreapplication.cpp:1746:5 frame #20: 0x00007fffd110ff81 libQt6Core.so.6`postEventSourceDispatch(s=0x000055555558a7c0, (null)=0x0000000000000000, (null)=0x0000000000000000) at qeventdispatcher_glib.cpp:246:5 frame #21: 0x00007fffcb4f7de2 libglib-2.0.so.0`___lldb_unnamed_symbol2573 + 402 frame #22: 0x00007fffcb5691f8 libglib-2.0.so.0`___lldb_unnamed_symbol2838 + 984 frame #23: 0x00007fffcb4f8223 libglib-2.0.so.0`g_main_context_iteration + 51 frame #24: 0x00007fffd110f1bb libQt6Core.so.6`QEventDispatcherGlib::processEvents(this=0x000055555558a840, flags=QEventLoop::ProcessEventsFlags @ 0x00007fffffffdc44) at qeventdispatcher_glib.cpp:399:19 frame #25: 0x00007fffcd877fb8 libQt6Gui.so.6`QPAEventDispatcherGlib::processEvents(this=0x000055555558a840, flags=QEventLoop::ProcessEventsFlags @ 0x00007fffffffdc74) at qeventdispatcher_glib.cpp:89:34 frame #26: 0x00007fffd0b87cb0 libQt6Core.so.6`QEventLoop::processEvents(this=0x00007fffffffde08, flags=QEventLoop::ProcessEventsFlags @ 0x00007fffffffdcc4) at qeventloop.cpp:104:55 frame #27: 0x00007fffd0b87f03 libQt6Core.so.6`QEventLoop::exec(this=0x00007fffffffde08, flags=QEventLoop::ProcessEventsFlags @ 0x00007fffffffdd7c) at qeventloop.cpp:186:9 frame #28: 0x00007fffd1b16490 libQt6Widgets.so.6`QDialog::exec(this=0x00007fffffffdeb0) at qdialog.cpp:575:26 frame #29: 0x000055555555751d main`main + 145 frame #30: 0x00007fffcfe2a578 libc.so.6`__libc_start_call_main(main=(main`main), argc=1, argv=0x00007fffffffe018) at libc_start_call_main.h:58:16 frame #31: 0x00007fffcfe2a63b libc.so.6`__libc_start_main_impl(main=(main`main), argc=1, argv=0x00007fffffffe018, init=<unavailable>, fini=<unavailable>, rtld_fini=<unavailable>, stack_end=0x00007fffffffe008) at libc-start.c:360:3 frame #32: 0x00005555555572e5 main`_start + 37
- relates to
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- Open
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- Closed
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