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Type: Bug
Resolution: Fixed
Priority: Not Evaluated
Fix Version/s: 6.8.4, 6.9.2, 6.10.0 Beta3
Affects Version/s: 6.10
Component/s: Core: Event loop
Labels:
None

Commits:
c8d3d7a7a (dev), 2a613662a (6.9), 8c4e99f7d (tqtc/lts-6.8), 1d1eadd19 (dev), 0fc9846f1 (dev), 104bdf96a (6.10), 7dde76196 (6.10), 2cd653d94 (6.9), 501c518d5 (6.9), bb66b247a (tqtc/lts-6.8), 0726388a5 (tqtc/lts-6.8)

Backtrace:

#0  0x00007fa07abbeb4e in QtPrivate::QMetaTypeForType<QList<QString> >::getMoveCtr()::{lambda(QtPrivate::QMetaTypeInterface const*, void*, void*)#1}::_FUN(QtPrivate::QMetaTypeInterface const*, void*, void*) () at /home/tjmaciei/obj/qt/installed/bin/../lib64/libQt6Core.t.so.6
#1  0x00007fa07ab89249 in QBasicTimer::stop() () at /home/tjmaciei/obj/qt/installed/bin/../lib64/libQt6Core.t.so.6
#2  0x00007fa07abffae9 in QSingleShotTimer::~QSingleShotTimer() () at /home/tjmaciei/obj/qt/installed/bin/../lib64/libQt6Core.t.so.6
#3  0x00007fa07abe0041 in QObjectPrivate::deleteChildren() () at /home/tjmaciei/obj/qt/installed/bin/../lib64/libQt6Core.t.so.6
#4  0x00007fa07abe672a in QObject::~QObject() () at /home/tjmaciei/obj/qt/installed/bin/../lib64/libQt6Core.t.so.6
#5  0x00007fa07bd24826 in QPAEventDispatcherGlib::~QPAEventDispatcherGlib() () at /home/tjmaciei/obj/qt/installed/bin/../lib64/libQt6Gui.t.so.6
#6  0x00007fa07b7e47a5 in QGuiApplication::~QGuiApplication() () at /home/tjmaciei/obj/qt/installed/bin/../lib64/libQt6Gui.t.so.6
#7  0x0000000000419669 in SharedTools::QtSingleApplication::~QtSingleApplication ()
    at /home/tjmaciei/src/qt/qt-creator/src/shared/qtsingleapplication/qtsingleapplication.cpp:104
#8  0x000000000040daf3 in std::default_delete<SharedTools::QtSingleApplication>::operator() () at /usr/include/c++/14/bits/unique_ptr.h:93
#9  std::unique_ptr<SharedTools::QtSingleApplication, std::default_delete<SharedTools::QtSingleApplication> >::~unique_ptr ()
    at /usr/include/c++/14/bits/unique_ptr.h:399
#10 main () at /home/tjmaciei/src/qt/qt-creator/src/app/main.cpp:1022

Frame 0 appears to be nonsense (jump to wrong address). Frame 1 is:

void QBasicTimer::stop()
{
    if (isActive()) {
        QAbstractEventDispatcher *eventDispatcher = QAbstractEventDispatcher::instance();
        if (eventDispatcher && !eventDispatcher->unregisterTimer(m_id)) {
            qWarning("QBasicTimer::stop: Failed. Possibly trying to stop from a different thread");
            return;
        }
        QAbstractEventDispatcherPrivate::releaseTimerId(m_id);
    }
    m_id = Qt::TimerId::Invalid;
}

Disassembly shows the crash happened in the call eventDispatcher->unregisterTimer. This pointer is valid, but the vtable inside of it is:

0x326be350:     0x7fa07b068948 <_ZTV7QObject+16>

This is a partially destroyed object. In fact, the backtrace tells us that: this is a QBasicTimer associated with the event dispatcher object, but is being destroyed by the QObject destructor... so the dispatcher no longer exists.