Details
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Bug
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Resolution: Duplicate
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Not Evaluated
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None
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5.1.1
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None
Description
This example is a bit contrived, but the crash signature matches what I'm seeing in real code.
import QtQuick 2.1 Item { id: root property var model: ListModel {} Loader { id: loader sourceComponent: component } Component { id: component Instantiator { model: root.model onObjectAdded: object.parent = root Rectangle { color: 'red' x: 0 y: model.foo * 20 width: 18 height: 18 } } } property var __fns: [ function() { loader.active = false; }, function() { model.remove(1, 1); }, function() { loader.active = true; }, ] Timer { interval: 1000 running: true repeat: true onTriggered: { __fns.shift()(); if (!__fns.length) { running = false; } } } Component.onCompleted: { model.append({'foo': 1}); model.append({'foo': 2}); } }
When it runs the second function (after a couple seconds... model.remove(1, 1)), it crashes at:
> Qt5Qmld.dll!QQmlContext::isValid() Line 233 + 0x3 bytes C++ Qt5Qmld.dll!QQmlDelegateModelPrivate::emitChanges() Line 1414 + 0x37 bytes C++ Qt5Qmld.dll!QQmlDelegateModel::_q_itemsRemoved(int index, int count) Line 1336 C++ Qt5Qmld.dll!QQmlDelegateModel::_q_rowsRemoved(const QModelIndex & parent, int begin, int end) Line 1502 C++ Qt5Qmld.dll!QQmlDelegateModel::qt_static_metacall(QObject * _o, QMetaObject::Call _c, int _id, void * * _a) Line 190 + 0x21 bytes C++ Qt5Qmld.dll!QQmlDelegateModel::qt_metacall(QMetaObject::Call _c, int _id, void * * _a) Line 282 + 0x15 bytes C++ Qt5Cored.dll!QMetaObject::metacall(QObject * object, QMetaObject::Call cl, int idx, void * * argv) Line 308 C++ Qt5Cored.dll!QMetaObject::activate(QObject * sender, int signalOffset, int local_signal_index, void * * argv) Line 3509 + 0x30 bytes C++ Qt5Cored.dll!QMetaObject::activate(QObject * sender, const QMetaObject * m, int local_signal_index, void * * argv) Line 3369 + 0x1e bytes C++ Qt5Cored.dll!QAbstractItemModel::rowsRemoved(const QModelIndex & _t1, int _t2, int _t3, QAbstractItemModel::QPrivateSignal __formal) Line 441 + 0x14 bytes C++ Qt5Cored.dll!QAbstractItemModel::endRemoveRows() Line 2617 C++ Qt5Qmld.dll!QQmlListModel::emitItemsRemoved(int index, int count) Line 1697 C++ Qt5Qmld.dll!QQmlListModel::remove(QQmlV8Function * args) Line 1907 C++ Qt5Qmld.dll!QQmlListModel::qt_static_metacall(QObject * _o, QMetaObject::Call _c, int _id, void * * _a) Line 122 + 0x11 bytes C++ Qt5Qmld.dll!QQmlListModel::qt_metacall(QMetaObject::Call _c, int _id, void * * _a) Line 182 + 0x15 bytes C++ Qt5Cored.dll!QMetaObject::metacall(QObject * object, QMetaObject::Call cl, int idx, void * * argv) Line 308 C++ Qt5Qmld.dll!QV8QObjectWrapper::Invoke(void * [2] args) Line 2045 + 0x14 bytes C++ Qt5V8d.dll!v8::internal::HandleApiCallHelper<0>(v8::internal::`anonymous-namespace'::BuiltinArguments<1> args, v8::internal::Isolate * isolate) Line 1164 + 0xe bytes C++ Qt5V8d.dll!v8::internal::Builtin_Impl_HandleApiCall(v8::internal::`anonymous-namespace'::BuiltinArguments<1> args, v8::internal::Isolate * isolate) Line 1182 + 0x11 bytes C++ Qt5V8d.dll!v8::internal::Builtin_HandleApiCall(v8::internal::`anonymous-namespace'::BuiltinArguments<1> args, v8::internal::Isolate * isolate) Line 1181 + 0x46 bytes C++ 3c60a236() Qt5V8d.dll!v8::internal::Invoke(bool is_construct, v8::internal::Handle<v8::internal::JSFunction> function, v8::internal::Handle<v8::internal::Object> receiver, int argc, v8::internal::Handle<v8::internal::Object> * args, bool * has_pending_exception, v8::internal::Handle<v8::internal::Object> qml) Line 125 + 0x17 bytes C++ Qt5V8d.dll!v8::internal::Execution::Call(v8::internal::Handle<v8::internal::Object> callable, v8::internal::Handle<v8::internal::Object> receiver, int argc, v8::internal::Handle<v8::internal::Object> * argv, bool * pending_exception, bool convert_receiver, v8::internal::Handle<v8::internal::Object> qml) Line 201 + 0x23 bytes C++ Qt5V8d.dll!v8::internal::Execution::Call(v8::internal::Handle<v8::internal::Object> callable, v8::internal::Handle<v8::internal::Object> receiver, int argc, v8::internal::Handle<v8::internal::Object> * argv, bool * pending_exception, bool convert_receiver) Line 168 + 0x2d bytes C++ Qt5V8d.dll!v8::Function::Call(v8::Handle<v8::Object> recv, int argc, v8::Handle<v8::Value> * argv) Line 3788 + 0x27 bytes C++ Qt5Qmld.dll!QQmlJavaScriptExpression::evaluate(QQmlContextData * context, v8::Handle<v8::Function> function, int argc, v8::Handle<v8::Value> * args, bool * isUndefined) Line 180 + 0x20 bytes C++ Qt5Qmld.dll!QQmlJavaScriptExpression::evaluate(QQmlContextData * context, v8::Handle<v8::Function> function, bool * isUndefined) Line 127 + 0x1c bytes C++ Qt5Qmld.dll!QQmlBoundSignalExpression::evaluate(void * * a) Line 224 C++ Qt5Qmld.dll!QQmlBoundSignal_callback(QQmlNotifierEndpoint * e, void * * a) Line 385 C++ Qt5Qmld.dll!QQmlNotifier::emitNotify(QQmlNotifierEndpoint * endpoint, void * * a) Line 83 + 0x1d bytes C++ Qt5Qmld.dll!QQmlData::signalEmitted(QAbstractDeclarativeData * __formal, QObject * object, int index, void * * a) Line 655 + 0x13 bytes C++ Qt5Cored.dll!QMetaObject::activate(QObject * sender, int signalOffset, int local_signal_index, void * * argv) Line 3387 + 0x1e bytes C++ Qt5Cored.dll!QMetaObject::activate(QObject * sender, const QMetaObject * m, int local_signal_index, void * * argv) Line 3369 + 0x1e bytes C++ Qt5Qmld.dll!QQmlTimer::triggered() Line 247 + 0x13 bytes C++ Qt5Qmld.dll!QQmlTimer::ticked() Line 314 C++ Qt5Qmld.dll!QQmlTimerPrivate::animationCurrentLoopChanged(QAbstractAnimationJob * __formal) Line 63 + 0x1f bytes C++ Qt5Qmld.dll!QAbstractAnimationJob::currentLoopChanged() Line 577 + 0x2b bytes C++ Qt5Qmld.dll!QAbstractAnimationJob::setCurrentTime(int msecs) Line 465 C++ Qt5Qmld.dll!QQmlAnimationTimer::updateAnimationsTime(__int64 delta) Line 118 C++ Qt5Cored.dll!QUnifiedTimer::updateAnimationTimers(__int64 currentTick) Line 290 C++ Qt5Cored.dll!QUnifiedTimer::timerEvent(QTimerEvent * event) Line 394 C++ Qt5Cored.dll!QObject::event(QEvent * e) Line 1060 C++ Qt5Widgetsd.dll!QApplicationPrivate::notify_helper(QObject * receiver, QEvent * e) Line 3471 + 0x11 bytes C++ Qt5Widgetsd.dll!QApplication::notify(QObject * receiver, QEvent * e) Line 2892 + 0x10 bytes C++ Qt5Cored.dll!QCoreApplication::notifyInternal(QObject * receiver, QEvent * event) Line 867 + 0x15 bytes C++ Qt5Cored.dll!QCoreApplication::sendEvent(QObject * receiver, QEvent * event) Line 232 + 0x39 bytes C++ Qt5Cored.dll!QEventDispatcherWin32Private::sendTimerEvent(int timerId) Line 585 + 0x10 bytes C++ Qt5Cored.dll!QEventDispatcherWin32::event(QEvent * e) Line 1137 C++ Qt5Widgetsd.dll!QApplicationPrivate::notify_helper(QObject * receiver, QEvent * e) Line 3471 + 0x11 bytes C++ Qt5Widgetsd.dll!QApplication::notify(QObject * receiver, QEvent * e) Line 2892 + 0x10 bytes C++ Qt5Cored.dll!QCoreApplication::notifyInternal(QObject * receiver, QEvent * event) Line 867 + 0x15 bytes C++ Qt5Cored.dll!QCoreApplication::sendEvent(QObject * receiver, QEvent * event) Line 232 + 0x39 bytes C++ Qt5Cored.dll!QCoreApplicationPrivate::sendPostedEvents(QObject * receiver, int event_type, QThreadData * data) Line 1471 + 0xd bytes C++ Qt5Cored.dll!QCoreApplication::sendPostedEvents(QObject * receiver, int event_type) Line 1329 + 0x11 bytes C++ Qt5Guid.dll!QWindowSystemInterface::sendWindowSystemEvents(QFlags<enum QEventLoop::ProcessEventsFlag> flags) Line 560 + 0xa bytes C++ qwindowsd.dll!QWindowsGuiEventDispatcher::sendPostedEvents() Line 86 + 0xd bytes C++ Qt5Cored.dll!qt_internal_proc(HWND__ * hwnd, unsigned int message, unsigned int wp, long lp) Line 423 C++ user32.dll!_InternalCallWinProc@20() + 0x23 bytes user32.dll!_UserCallWinProcCheckWow@36() + 0xbd bytes user32.dll!_DispatchMessageWorker@8() + 0xf8 bytes user32.dll!_DispatchMessageW@4() + 0x10 bytes Qt5Cored.dll!QEventDispatcherWin32::processEvents(QFlags<enum QEventLoop::ProcessEventsFlag> flags) Line 757 C++ qwindowsd.dll!QWindowsGuiEventDispatcher::processEvents(QFlags<enum QEventLoop::ProcessEventsFlag> flags) Line 78 + 0xd bytes C++ Qt5Cored.dll!QEventLoop::processEvents(QFlags<enum QEventLoop::ProcessEventsFlag> flags) Line 137 C++ Qt5Cored.dll!QEventLoop::exec(QFlags<enum QEventLoop::ProcessEventsFlag> flags) Line 212 + 0x26 bytes C++ Qt5Cored.dll!QCoreApplication::exec() Line 1120 + 0x15 bytes C++ Qt5Guid.dll!QGuiApplication::exec() Line 1221 C++ Qt5Widgetsd.dll!QApplication::exec() Line 2697 C++ qmlscene.exe!main(int argc, char * * argv) Line 533 + 0x6 bytes C++ qmlscene.exe!__tmainCRTStartup() Line 555 + 0x19 bytes C qmlscene.exe!mainCRTStartup() Line 371 C
The QQmlContext at the top of the stack has been deleted, confirmed by adding some prints of the contexts:
QQmlInstantiator::makeModel 0xa6acc0 QQmlDelegateModelPrivate::emitChanges 0xa6acc0 QQmlDelegateModelPrivate::emitChanges 0xa6acc0 QQmlDelegateModelPrivate::emitChanges 0xa6acc0 QQmlDelegateModelPrivate::emitChanges 0xa6acc0 ~QQmlContext 0xa6acc0 ~QQmlContext 0xaa2e90 QQmlDelegateModelPrivate::emitChanges 0xa6acc0
Switching to a Repeater, it does not crash.
Attachments
Issue Links
- is replaced by
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- Closed
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