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  1. Qt
  2. QTBUG-105286

Crash with UpdateWindowTitle event triggered by closing a dialog (mac)

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    Details

    • Platform/s:
      macOS
    • Commits:
      3be99799a6 (qt/qtbase/dev) 3be99799a6 (qt/tqtc-qtbase/dev) 6daa89f083 (qt/qtbase/6.3) 8855431c84 (qt/tqtc-qtbase/6.2) 6daa89f083 (qt/tqtc-qtbase/6.3) 580e0527eb (qt/tqtc-qtbase/5.15) 77a892affc (qt/qtbase/6.4) 77a892affc (qt/tqtc-qtbase/6.4)

      Description

      We hit this crash after upgrading Qt base from 5.10.0 to 5.15.4. It happens intermittently. The call stack we have captured looks like:

      1 libQt5Qml.5.15.4.dylib!QQmlData::isSignalConnected(QAbstractDeclarativeData*, QObject const*, int)
      2 libQt5Core.5.15.4.dylib!void doActivate<false>(QObject*, int, void**)
      3 libQt5Widgets.5.15.4.dylib!QWidget::setWindowTitle(String const&)
      ...
      6 libQt5Core.5.15.4.dylib!void doActivate<false>(QObject*, int, void**)
      ...
      10 libQt5Widgets.5.15.4.dylib!QApplicationPrivate::notify_helper(QObject*, QEvent*)
      11 libQt5Widgets.5.15.4.dylib!QApplication::notify(QObject*, QEvent*)
      ...
      13 libQt5Core.5.15.4.dylib!QCoreApplication::notifyInternal2(QObject*, QEvent*)
      14 libQt5Core.5.15.4.dylib!QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*)
      15 libqcocoa.dylib!QCocoaEventDispatcherPrivate::processPostedEvents()
      16 libqcocoa.dylib!QCocoaEventDispatcher::processEvents(QFlags<QEventLoop::ProcessEventsFlag>)
      17 libtabcore.dylib!CancelMgr::WaitForSignal(IEvent... >)
      ...
      20 libQt5Core.5.15.4.dylib!QObjectPrivate::deleteChildren()
      21 libQt5Widgets.5.15.4.dylib!Widget::~QWidget()
      22 libtabui.dylib!ConnectWebDataDialog::ShowWebDataDialog(...)
      ... ... 

      We don't use the QML; but the union in QtBase - src/corelib/kernel/qobject_p.h

      union

      Unknown macro: { QObject *currentChildBeingDeleted; // should only be used when QObjectData}

      ;

      could lead the code to QmlData::isSignalConnected...

      Attached is a Qt creator project - WindowTitleDialogIssue.zip - for easy repro.

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              Assignee:
              vhilshei Volker Hilsheimer
              Reporter:
              ying.peng Ying Peng
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                Created:
                Updated:
                Resolved: