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  1. Qt
  2. QTBUG-43754

crash in QQmlObjectCreator::populateInstance when instantiating qml file

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    Description

      we are using statically linked qt within a plugin. the first plugin instance works fine. however further plugin instances (after unloading the initial instance) cannot instantiate the qml file anymore:

      • QQmlComponent::loadUrl() can load the url
      • QQmlComponent::create() crashes in: 
        Exception Type:        EXC_BAD_ACCESS (SIGSEGV)
Exception Codes:       KERN_INVALID_ADDRESS at 0x0000000000000008


Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0   myPlugin	0x00000001274fcf3c QT_NAMESPACE::QScopedPointer<QT_NAMESPACE::QObjectData, QT_NAMESPACE::QScopedPointerDeleter<QT_NAMESPACE::QObjectData> >::data() const + 12
1   myPlugin	0x00000001274f32b5 QT_NAMESPACE::QScopedPointer<QT_NAMESPACE::QObjectData, QT_NAMESPACE::QScopedPointerDeleter<QT_NAMESPACE::QObjectData> >::pointer QT_NAMESPACE::qGetPtrHelper<QT_NAMESPACE::QScopedPointer<QT_NAMESPACE::QObjectData, QT_NAMESPACE::QScopedPointerDeleter<QT_NAMESPACE::QObjectData> > >(QT_NAMESPACE::QScopedPointer<QT_NAMESPACE::QObjectData, QT_NAMESPACE::QScopedPointerDeleter<QT_NAMESPACE::QObjectData> > const&) + 21
2   myPlugin	0x00000001274f3f6c QT_NAMESPACE::QObject::d_func() const + 28
3   myPlugin	0x00000001274e7153 QT_NAMESPACE::QObject::objectName() const + 35
4   myPlugin	0x000000012635c7d1 QT_NAMESPACE::QQmlObjectCreator::populateInstance(int, QT_NAMESPACE::QObject*, QT_NAMESPACE::QObject*, QT_NAMESPACE::QQmlPropertyData*, QT_NAMESPACE::QBitArray const&) + 113
5   myPlugin	0x000000012635ac76 QT_NAMESPACE::QQmlObjectCreator::setPropertyBinding(QT_NAMESPACE::QQmlPropertyData*, QT_NAMESPACE::QV4::CompiledData::Binding const*) + 438
6   myPlugin	0x0000000126358583 QT_NAMESPACE::QQmlObjectCreator::setupBindings(QT_NAMESPACE::QBitArray const&) + 2115
7   myPlugin	0x000000012635cd1d QT_NAMESPACE::QQmlObjectCreator::populateInstance(int, QT_NAMESPACE::QObject*, QT_NAMESPACE::QObject*, QT_NAMESPACE::QQmlPropertyData*, QT_NAMESPACE::QBitArray const&) + 1469
8   myPlugin	0x0000000126357792 QT_NAMESPACE::QQmlObjectCreator::createInstance(int, QT_NAMESPACE::QObject*, bool) + 4290
9   myPlugin	0x000000012635af4e QT_NAMESPACE::QQmlObjectCreator::setPropertyBinding(QT_NAMESPACE::QQmlPropertyData*, QT_NAMESPACE::QV4::CompiledData::Binding const*) + 1166
10  myPlugin	0x0000000126358583 QT_NAMESPACE::QQmlObjectCreator::setupBindings(QT_NAMESPACE::QBitArray const&) + 2115
11  myPlugin	0x000000012635cd1d QT_NAMESPACE::QQmlObjectCreator::populateInstance(int, QT_NAMESPACE::QObject*, QT_NAMESPACE::QObject*, QT_NAMESPACE::QQmlPropertyData*, QT_NAMESPACE::QBitArray const&) + 1469
12  myPlugin	0x0000000126357792 QT_NAMESPACE::QQmlObjectCreator::createInstance(int, QT_NAMESPACE::QObject*, bool) + 4290
13  myPlugin	0x000000012635af4e QT_NAMESPACE::QQmlObjectCreator::setPropertyBinding(QT_NAMESPACE::QQmlPropertyData*, QT_NAMESPACE::QV4::CompiledData::Binding const*) + 1166
14  myPlugin	0x0000000126358583 QT_NAMESPACE::QQmlObjectCreator::setupBindings(QT_NAMESPACE::QBitArray const&) + 2115
15  myPlugin	0x000000012635cd1d QT_NAMESPACE::QQmlObjectCreator::populateInstance(int, QT_NAMESPACE::QObject*, QT_NAMESPACE::QObject*, QT_NAMESPACE::QQmlPropertyData*, QT_NAMESPACE::QBitArray const&) + 1469
16  myPlugin	0x0000000126357792 QT_NAMESPACE::QQmlObjectCreator::createInstance(int, QT_NAMESPACE::QObject*, bool) + 4290
17  myPlugin	0x000000012635af4e QT_NAMESPACE::QQmlObjectCreator::setPropertyBinding(QT_NAMESPACE::QQmlPropertyData*, QT_NAMESPACE::QV4::CompiledData::Binding const*) + 1166
18  myPlugin	0x0000000126358583 QT_NAMESPACE::QQmlObjectCreator::setupBindings(QT_NAMESPACE::QBitArray const&) + 2115
19  myPlugin	0x000000012635cd1d QT_NAMESPACE::QQmlObjectCreator::populateInstance(int, QT_NAMESPACE::QObject*, QT_NAMESPACE::QObject*, QT_NAMESPACE::QQmlPropertyData*, QT_NAMESPACE::QBitArray const&) + 1469
20  myPlugin	0x0000000126357792 QT_NAMESPACE::QQmlObjectCreator::createInstance(int, QT_NAMESPACE::QObject*, bool) + 4290
21  myPlugin	0x000000012635af4e QT_NAMESPACE::QQmlObjectCreator::setPropertyBinding(QT_NAMESPACE::QQmlPropertyData*, QT_NAMESPACE::QV4::CompiledData::Binding const*) + 1166
22  myPlugin	0x0000000126358583 QT_NAMESPACE::QQmlObjectCreator::setupBindings(QT_NAMESPACE::QBitArray const&) + 2115
23  myPlugin	0x000000012635cd1d QT_NAMESPACE::QQmlObjectCreator::populateInstance(int, QT_NAMESPACE::QObject*, QT_NAMESPACE::QObject*, QT_NAMESPACE::QQmlPropertyData*, QT_NAMESPACE::QBitArray const&) + 1469
24  myPlugin	0x0000000126357792 QT_NAMESPACE::QQmlObjectCreator::createInstance(int, QT_NAMESPACE::QObject*, bool) + 4290
25  myPlugin	0x0000000126356567 QT_NAMESPACE::QQmlObjectCreator::create(int, QT_NAMESPACE::QObject*, QT_NAMESPACE::QQmlInstantiationInterrupt*) + 1943
26  myPlugin	0x0000000126356eed QT_NAMESPACE::QQmlObjectCreator::createInstance(int, QT_NAMESPACE::QObject*, bool) + 2077
27  myPlugin	0x000000012635af4e QT_NAMESPACE::QQmlObjectCreator::setPropertyBinding(QT_NAMESPACE::QQmlPropertyData*, QT_NAMESPACE::QV4::CompiledData::Binding const*) + 1166
28  myPlugin	0x0000000126358583 QT_NAMESPACE::QQmlObjectCreator::setupBindings(QT_NAMESPACE::QBitArray const&) + 2115
29  myPlugin	0x000000012635cd1d QT_NAMESPACE::QQmlObjectCreator::populateInstance(int, QT_NAMESPACE::QObject*, QT_NAMESPACE::QObject*, QT_NAMESPACE::QQmlPropertyData*, QT_NAMESPACE::QBitArray const&) + 1469
30  myPlugin	0x0000000126357792 QT_NAMESPACE::QQmlObjectCreator::createInstance(int, QT_NAMESPACE::QObject*, bool) + 4290
31  myPlugin	0x0000000126356567 QT_NAMESPACE::QQmlObjectCreator::create(int, QT_NAMESPACE::QObject*, QT_NAMESPACE::QQmlInstantiationInterrupt*) + 1943
32  myPlugin	0x0000000126356eed QT_NAMESPACE::QQmlObjectCreator::createInstance(int, QT_NAMESPACE::QObject*, bool) + 2077
33  myPlugin	0x0000000126356567 QT_NAMESPACE::QQmlObjectCreator::create(int, QT_NAMESPACE::QObject*, QT_NAMESPACE::QQmlInstantiationInterrupt*) + 1943
34  myPlugin	0x00000001262b415c QT_NAMESPACE::QQmlComponentPrivate::beginCreate(QT_NAMESPACE::QQmlContextData*) + 940
35  myPlugin	0x00000001262b3da2 QT_NAMESPACE::QQmlComponent::beginCreate(QT_NAMESPACE::QQmlContext*) + 98
36  myPlugin	0x00000001262b3cfd QT_NAMESPACE::QQmlComponent::create(QT_NAMESPACE::QQmlContext*) + 125

      this crash somehow seems to be triggered, if a Component:

      • contains Keys properties, like 
            Keys.onReturnPressed: doSomething()
    Keys.onEnterPressed: doSomething()
    Keys.onEscapePressed: doSomethingElse()
      • contains elements from QtGraphicalEffects (like DropShadow or ColorOverlay)

      removing all Keys properties and QtGraphicalEffects components resolves this issue.

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            aalpert Alan Alpert
            timblechmann tim blechmann
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              Created:
              Updated:
              Resolved:

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