QQmlEngine singleton double free - qt

Question

for using a QQmlEngine singleton in multiple qquickwindow , qquickwidget,qquickview,
(if each window create a QQmlEngine, you will have to set plugins path, import qmldir path ,..etc again and again)
i store QQmlEngine singleton into my ioc container. it's a std::shared_ptr in template class;
when i exit app.exec(); then error :
*** Error in `path to my executeable': double free or corruption (out): 0x00000000029df190 ***
======= Backtrace: =========
.
.
.
my ioc container backtrace...
.
.
.
============================
my code is:
{
auto p_engine = IocContainer::get()->ResolveObject<QQmlEngine>().get();
QQmlComponent component(p_engine);
QQuickWindow::setDefaultAlphaBuffer(true);
auto url = transUrl("qrc:/dv_qmlLib/Window/QmlDebugWindow.qml");
component.loadUrl(url);
if ( component.isReady() )
{
QEventLoop loop;
auto a = component.create();
qmlDebugWindow* win = reinterpret_cast<qmlDebugWindow*>(a);
QObject::connect(win,&QQuickWindow::closing,&loop,[&](auto* p){
Q_UNUSED(p)
if(win->isClosed())
loop.exit();
});
if(onWinCreated)
onWinCreated(win);
win->setLoadUrl(qmlUrl);
loop.exec();
loop.disconnect(win);
win->deleteLater();
}
else
qWarning() << component.errorString();
}
but i don't know where is the first destroy method called;
print QQmlEngine::objectOwnerShip indicte it owner is cpp;
i also test QQmlApplicationEngine , it has a same error:double free.
have one meeted this error ?
i want to using a QQmlEninge singleton in my application. (base on qwidgets, but have some qquickwindow, qquickwidget, and their are using qml library) ,and when app exit , QQmlEngine singleton will not double free;