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Bug
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Resolution: Fixed
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P1: Critical
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6.8.1
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None
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- OS: Windows 10 22h2
- Qt Version: 6.8.1
- Compiler: MSVC 17 (VS2022)
- Build Type: Debug (release builds unaffected)
- Architecture: x64
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Windows
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b02b9fb43 (dev), 90c35756d (6.10), 8523b4feb (6.9), 88ae008e2 (6.8), 9e613024b (tqtc/lts-6.8)
Summary
QQuickWebEngineScriptCollection crashes with assertion "engine" when accessing userScripts.collection after adding a custom library path via QCoreApplication::addLibraryPath - Windows debug builds only
Steps to Reproduce
1. Call `QCoreApplication::addLibraryPath()` to add a custom library path
2. Register a C++ singleton type exposing a `QQuickWebEngineProfile*` property via `qmlRegisterSingletonType`
3. Load QML (QQuickView::setSource) that accesses the `userScripts.collection` property of the WebEngineView profile
Expected outcome
The application should load normally and allow access to the userScripts collection without crashing.
Result
Application crashes with assertion failure: "engine" in `c:\qt\6.8.1\Src\qtwebengine\src\webenginequick\api\qquickwebenginescriptcollection.cpp:242`
Additional Details
- Crash occurs ONLY when custom library path is added AND only in Windows debug builds
- Release builds work fine
- macOS builds (debug and release) work fine
Minimal implementation
singleton
class Model : public QObject { Q_OBJECT public: Q_INVOKABLE QQuickWebEngineProfile* profile() { return mProfile; } private: QQuickWebEngineProfile* mProfile; };
qml
import QtQuick import QtWebChannel import QtWebEngine WebEngineView { id: webView Component.onCompleted: { var qtWebChannelScript = WebEngine.script() var setHooksScript = WebEngine.script() webView.profile.userScripts.collection = [ qtWebChannelScript, setHooksScript ] } }
Crash Stack Trace
> Qt6Cored.dll!qAbort() Line 38 C++ Qt6Cored.dll!qt_message_fatal<QString &>(QtMsgType __formal, const QMessageLogContext & context, QString & message) Line 2117 C++ Qt6Cored.dll!qt_message(QtMsgType msgType, const QMessageLogContext & context, const char * msg, char * ap) Line 382 C++ Qt6Cored.dll!QMessageLogger::fatal(const char * msg, ...) Line 885 C++ Qt6Cored.dll!qt_assert(const char * assertion, const char * file, int line) Line 104 C++ Qt6WebEngineQuickd.dll!QQuickWebEngineScriptCollection::setQmlEngine(QQmlEngine * engine) Line 243 C++ Qt6WebEngineQuickd.dll!QQuickWebEngineProfilePrivate::getUserScripts() Line 339 C++ Qt6WebEngineQuickd.dll!QQuickWebEngineProfile::userScripts() Line 1120 C++ Qt6WebEngineQuickd.dll!QQuickWebEngineProfile::qt_static_metacall(QObject * _o, QMetaObject::Call _c, int _id, void * * _a) Line 535 C++ Qt6Qmld.dll!QQmlPropertyData::readPropertyWithArgs(QObject * target, void * * args) Line 375 C++ Qt6Qmld.dll!QQmlPropertyData::readProperty(QObject * target, void * property) Line 359 C++ Qt6Qmld.dll!QV4::loadProperty(QV4::ExecutionEngine * v4, QV4::Heap::Object * wrapper, QObject * object, const QQmlPropertyData & property) Line 123 C++ Qt6Qmld.dll!QV4::QObjectWrapper::getProperty(QV4::ExecutionEngine * engine, QV4::Heap::Object * wrapper, QObject * object, const QQmlPropertyData * property, QFlags<enum QV4::QObjectWrapper::Flag> flags) Line 377 C++ Qt6Qmld.dll!QV4::QObjectWrapper::lookupPropertyGetterImpl<`QV4::Lookup::getterQObject'::`2'::<lambda_1>>(QV4::Lookup * lookup, QV4::ExecutionEngine * engine, const QV4::Value & object, QFlags<enum QV4::QObjectWrapper::Flag> flags, QV4::Lookup::getterQObject::__l2::<lambda_1> revertLookup) Line 311 C++ Qt6Qmld.dll!QV4::Lookup::getterQObject(QV4::Lookup * lookup, QV4::ExecutionEngine * engine, const QV4::Value & object) Line 420 C++ Qt6Qmld.dll!QV4::QObjectWrapper::virtualResolveLookupGetter(const QV4::Object * object, QV4::ExecutionEngine * engine, QV4::Lookup * lookup) Line 1135 C++ Qt6Qmld.dll!QV4::Object::resolveLookupGetter(QV4::ExecutionEngine * engine, QV4::Lookup * lookup) Line 342 C++ Qt6Qmld.dll!QV4::Lookup::resolveGetter(QV4::ExecutionEngine * engine, const QV4::Object * object) Line 39 C++ Qt6Qmld.dll!QV4::Lookup::getterGeneric(QV4::Lookup * l, QV4::ExecutionEngine * engine, const QV4::Value & object) Line 115 C++ Qt6Qmld.dll!QV4::Moth::VME::interpret(QV4::JSTypesStackFrame * frame, QV4::ExecutionEngine * engine, const char * code) Line 674 C++ Qt6Qmld.dll!QV4::Moth::VME::exec(QV4::JSTypesStackFrame * frame, QV4::ExecutionEngine * engine) Line 487 C++ Qt6Qmld.dll!QV4::doCall(QV4::Function * self, const QV4::Value * thisObject, const QV4::Value * argv, int argc, QV4::ExecutionContext * context) Line 52 C++ Qt6Qmld.dll!QV4::Function::call(const QV4::Value * thisObject, const QV4::Value * argv, int argc, QV4::ExecutionContext * context) Line 78 C++ Qt6Qmld.dll!QV4::Function::call::__l5::<lambda_1>::operator()(const QV4::Value * thisObject, const QV4::Value * argv, int argc) Line 29 C++ Qt6Qmld.dll!QV4::convertAndCall<`QV4::Function::call'::`5'::<lambda_1>>(QV4::ExecutionEngine * engine, QObject * thisObject, void * * a, const QMetaType * types, int argc, QV4::Function::call::__l5::<lambda_1> call) Line 199 C++ Qt6Qmld.dll!QV4::Function::call(QObject * thisObject, void * * a, const QMetaType * types, int argc, QV4::ExecutionContext * context) Line 25 C++ Qt6Qmld.dll!QQmlJavaScriptExpression::evaluate(void * * a, const QMetaType * types, int argc) Line 270 C++ Qt6Qmld.dll!QQmlBoundSignalExpression::evaluate(void * * a) Line 203 C++ Qt6Qmld.dll!QQmlBoundSignal_callback(QQmlNotifierEndpoint * e, void * * a) Line 316 C++ Qt6Qmld.dll!QQmlNotifier::emitNotify(QQmlNotifierEndpoint * endpoint, void * * a) Line 71 C++ Qt6Qmld.dll!QQmlData::signalEmitted(QAbstractDeclarativeData * __formal, QObject * object, int index, void * * a) Line 342 C++ Qt6Cored.dll!doActivate<0>(QObject * sender, int signal_index, void * * argv) Line 4018 C++ Qt6Cored.dll!QMetaObject::activate(QObject * sender, const QMetaObject * m, int local_signal_index, void * * argv) Line 4185 C++ Qt6Qmld.dll!QQmlComponentAttached::completed() Line 155 C++ Qt6Qmld.dll!QQmlObjectCreator::finalize(QQmlInstantiationInterrupt & interrupt) Line 1606 C++ Qt6Qmld.dll!QQmlComponentPrivate::complete(QQmlEnginePrivate * enginePriv, QQmlComponentPrivate::ConstructionState * state) Line 1190 C++ Qt6Qmld.dll!QQmlComponentPrivate::completeCreate() Line 1305 C++ Qt6Qmld.dll!QQmlComponent::completeCreate() Line 1272 C++ Qt6Qmld.dll!QQmlComponentPrivate::createWithProperties(QObject * parent, const QMap<QString,QVariant> & properties, QQmlContext * context, QQmlComponentPrivate::CreateBehavior behavior, bool createFromQml) Line 973 C++ Qt6Qmld.dll!QQmlComponent::create(QQmlContext * context) Line 916 C++ Qt6Quickd.dll!QQuickView::continueExecute() Line 513 C++ Qt6Quickd.dll!QQuickViewPrivate::execute() Line 76 C++ Qt6Quickd.dll!QQuickView::setSource(const QUrl & url) Line 239 C++