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  1. Qt
  2. QTBUG-64282

QDeclarativeGeoMapItemView::removeInstantiatedItems crash when remove items added with a Q_INVOKABLE



    • Type: Bug
    • Status: Closed
    • Priority: P1: Critical
    • Resolution: Invalid
    • Affects Version/s: 5.6, 5.9.2
    • Fix Version/s: None
    • Component/s: Location
    • Labels:
    • Environment:
      * Qt: 5.9.2, 5.6;
       * OS: MacOs High Sierra (10.13), Android 4.2.


      For some reason when a MapItemView removes items related to object created with a Q_INVOKABLE it crashes.

      Attached there is a simple project to reproduce the crash.

      To program has a Map with a MapItemView that shows some markes, based on a c++ model, and two buttons (connected to two Q_INVOKABLEs in the model), one to add data, and one to reset them. The model is exposed as a context property.

      At startup such model is filled with some mocked data from the c++, so if you click on "add data" OR "reset" it works, but as soon as data are added with the Q_INVOKABLE call (button to add data), any subsequent action (add/reset) results in a crash when the MapItemView tries to remove previously instantiated objects.

      A possible (really dirty) workaround is to set the view's model to undefined, add data and reset it to the correct context property.


      The debugged shows this:


      1 QDeclarativeGeoMapItemView::removeInstantiatedItems() 0x10cc6a1a0
      2 QDeclarativeGeoMapItemView::itemModelReset() 0x10cc6ae5e
      3 QMetaObject::activate(QObject *, int, int, void * *) 0x100b3fab1
      4 QAbstractItemModel::endResetModel() 0x100abf784
      5 LocationsModel::reset() LocationsModel.cpp 65 0x10000596b
      6 LocationsModel::qt_static_metacall(QObject *, QMetaObject::Call, int, void * *) moc_LocationsModel.cpp 86 0x100006d25
      7 LocationsModel::qt_metacall(QMetaObject::Call, int, void * *) moc_LocationsModel.cpp 119 0x100006ed5
      8 CallMethod(QQmlObjectOrGadget const&, int, int, int, int *, QV4::ExecutionEngine *, QV4::CallData *, QMetaObject::Call) 0x1005ccdd2
      9 CallPrecise(QQmlObjectOrGadget const&, QQmlPropertyData const&, QV4::ExecutionEngine *, QV4::CallData *, QMetaObject::Call) 0x1005cb671
      10 QV4::QObjectMethod::callInternal(QV4::CallData *, QV4::Scope&) const 0x1005caff0
      11 QV4::Runtime::method_callProperty(QV4::ExecutionEngine *, int, QV4::CallData *) 0x1005ded4a
      12 QV4::Moth::VME::run(QV4::ExecutionEngine *, unsigned const char *) 0x1005db554
      13 QV4::Moth::VME::exec(QV4::ExecutionEngine *, unsigned const char *) 0x1005dd180
      14 QV4::ExecutionContext::call(QV4::Scope&, QV4::CallData *, QV4::Function *, QV4::FunctionObject const *) 0x10054ac7c
      15 QQmlJavaScriptExpression::evaluate(QV4::CallData *, bool *, QV4::Scope&) 0x10067c2cc
      16 QQmlBoundSignalExpression::evaluate(void * *) 0x1006139b7
      17 QQmlBoundSignal_callback(QQmlNotifierEndpoint *, void * *) 0x10061417d
      18 QQmlNotifier::emitNotify(QQmlNotifierEndpoint *, void * *) 0x10065d37d
      19 QMetaObject::activate(QObject *, int, int, void * *) 0x100b3f799
      20 QQuickAbstractButtonPrivate::handleRelease(QPointF const&) 0x10ca72741
      ... <More>



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            paangele Paolo Angelelli
            paskol Pasquale Damiani
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