Thread 1 "demo" received signal SIGSEGV, Segmentation fault. 0x00007ffff7d7849e in QWidget::show() () from /usr/lib64/libQt6Widgets.so.6 (gdb) backtrace #0 0x00007ffff7d7849e in QWidget::show() () at /usr/lib64/libQt6Widgets.so.6 #1 0x00007ffff7bcb3a6 in ??? () at /usr/lib64/libQt6Widgets.so.6 #2 0x00007ffff6b02bab in ??? () at /usr/lib64/libQt6Core.so.6 #3 0x00007ffff6a0d43f in QAbstractAnimationPrivate::setState(QAbstractAnimation::State) () at /usr/lib64/libQt6Core.so.6 #4 0x00007ffff6a0d28f in QAbstractAnimationPrivate::setState(QAbstractAnimation::State) () at /usr/lib64/libQt6Core.so.6 #5 0x00007ffff7c465e3 in ??? () at /usr/lib64/libQt6Widgets.so.6 #6 0x00007ffff7c50a56 in ??? () at /usr/lib64/libQt6Widgets.so.6 #7 0x00007ffff7b5fc3f in ??? () at /usr/lib64/libQt6Widgets.so.6 #8 0x00007ffff6b02e05 in ??? () at /usr/lib64/libQt6Core.so.6 #9 0x00007ffff7bba7df in QTabBar::setCurrentIndex(int) () at /usr/lib64/libQt6Widgets.so.6 #10 0x00007ffff7c72a98 in ??? () at /usr/lib64/libQt6Widgets.so.6 #11 0x00007ffff7b5ed9e in ??? () at /usr/lib64/libQt6Widgets.so.6 #12 0x0000555555558916 in MainWindow::setDefaultDockArrangement (this=0x5555559a3040) at /home/tobias/tmp/9/MainWindow.cpp:61 #13 0x0000555555559ab6 in QtPrivate::FunctorCall, QtPrivate::List<>, void, void (MainWindow::*)()>::call(void (MainWindow::*)(), MainWindow*, void**)::{lambda()#1}::operator()() const (__closure=0x7fffffffc160) at /usr/include/qt6/QtCore/qobjectdefs_impl.h:127 #14 0x0000555555559c2b in QtPrivate::FunctorCallBase::call_internal, QtPrivate::List<>, void, void (MainWindow::*)()>::call(void (MainWindow::*)(), MainWindow*, void**)::{lambda()#1}>(void**, QtPrivate::FunctorCall, QtPrivate::List<>, void, void (MainWindow::*)()>::call(void (MainWindow::*)(), MainWindow*, void**)::{lambda()#1}&&) (args=0x7fffffffc310, fn=...) at /usr/include/qt6/QtCore/qobjectdefs_impl.h:65 #15 0x0000555555559b2c in QtPrivate::FunctorCall, QtPrivate::List<>, void, void (MainWindow::*)()>::call(void (MainWindow::*)(), MainWindow*, void**) (f=(void (MainWindow::*)(MainWindow * const)) 0x555555558670 , o=0x5555559a3040, arg=0x7fffffffc310) at /usr/include/qt6/QtCore/qobjectdefs_impl.h:126 #16 0x00005555555599c8 in QtPrivate::FunctionPointer::call, void>(void (MainWindow::*)(), MainWindow*, void**) (f=(void (MainWindow::*)(MainWindow * const)) 0x555555558670 for more, q to quit, c to continue without paging-- nt()>, o=0x5555559a3040, arg=0x7fffffffc310) at /usr/include/qt6/QtCore/qobjectdefs_impl.h:174 #17 0x0000555555559849 in QtPrivate::QCallableObject, void>::impl(int, QtPrivate::QSlotObjectBase*, QObject*, void**, bool*) (which=1, this_=0x555555965740, r=0x5555559a3040, a=0x7fffffffc310, ret=0x0) at /usr/include/qt6/QtCore/qobjectdefs_impl.h:545 #18 0x00007ffff6b02bab in ??? () at /usr/lib64/libQt6Core.so.6 #19 0x00007ffff72fccbd in QAction::activate(QAction::ActionEvent) () at /usr/lib64/libQt6Gui.so.6 #20 0x00007ffff7b68d40 in ??? () at /usr/lib64/libQt6Widgets.so.6 #21 0x00007ffff7bda989 in ??? () at /usr/lib64/libQt6Widgets.so.6 #22 0x00007ffff7d7bc88 in QWidget::event(QEvent*) () at /usr/lib64/libQt6Widgets.so.6 #23 0x00007ffff7d68a86 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib64/libQt6Widgets.so.6 #24 0x00007ffff7d6981d in QApplication::notify(QObject*, QEvent*) () at /usr/lib64/libQt6Widgets.so.6 #25 0x00007ffff6b1b718 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib64/libQt6Core.so.6 #26 0x00007ffff7d744eb in QApplicationPrivate::sendMouseEvent(QWidget*, QMouseEvent*, QWidget*, QWidget*, QWidget**, QPointer&, bool, bool) () at /usr/lib64/libQt6Widgets.so.6 #27 0x00007ffff7d76e21 in ??? () at /usr/lib64/libQt6Widgets.so.6 #28 0x00007ffff7d7de10 in ??? () at /usr/lib64/libQt6Widgets.so.6 #29 0x00007ffff7d68a86 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib64/libQt6Widgets.so.6 #30 0x00007ffff6b1b718 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib64/libQt6Core.so.6 #31 0x00007ffff6f88b34 in QGuiApplicationPrivate::processMouseEvent(QWindowSystemInterfacePrivate::MouseEvent*) () at /usr/lib64/libQt6Gui.so.6 #32 0x00007ffff6fea424 in QWindowSystemInterface::sendWindowSystemEvents(QFlags) () at /usr/lib64/libQt6Gui.so.6 #33 0x00007ffff35ae50e in ??? () at /usr/lib64/qt6/plugins/platforms/../../../libQt6XcbQpa.so.6 #34 0x00007ffff6129b12 in ??? () at /usr/lib64/libglib-2.0.so.0 #35 0x00007ffff612cf47 in ??? () at /usr/lib64/libglib-2.0.so.0 #36 0x00007ffff612d6f0 in g_main_context_iteration () at /usr/lib64/libglib-2.0.so.0 --Type for more, q to quit, c to continue without paging-- #37 0x00007ffff68ccaf3 in QEventDispatcherGlib::processEvents(QFlags) () at /usr/lib64/libQt6Core.so.6 #38 0x00007ffff6b48de2 in QEventLoop::exec(QFlags) () at /usr/lib64/libQt6Core.so.6 #39 0x00007ffff6b48f83 in QCoreApplication::exec() () at /usr/lib64/libQt6Core.so.6 #40 0x00005555555579cc in main (argc=1, argv=0x7fffffffd1b8) at /home/tobias/tmp/9/main.cpp:9