[Development] QtQuick: new Drag&Drop crashes

[Thiago Macieira]

Please run valgrind with debug-mode Qt too. Valgrinding release-mode Qt is not 
helpful. We need to know what these question marks mean:

On terça-feira, 21 de janeiro de 2014 01:36:36, Fabien Castan wrote:
> ==22064== Invalid read of size 8
> ==22064==    at 0x6306D30: QDrag::mimeData() const (in
> /opt/Qt5.2.0/5.2.0/gcc_64/lib/libQt5Gui.so.5.2.0)
> ==22064==    by 0xD4BA356: ??? (in
> /opt/Qt5.2.0/5.2.0/gcc_64/plugins/platforms/libqxcb.so)
> ==22064==    by 0xD4B1E67: ??? (in
> /opt/Qt5.2.0/5.2.0/gcc_64/plugins/platforms/libqxcb.so)
> ==22064==    by 0xD4B2A5A: ??? (in
> /opt/Qt5.2.0/5.2.0/gcc_64/plugins/platforms/libqxcb.so)
> ==22064==    by 0x6B4D90D: QObject::event(QEvent*) (in
> /opt/Qt5.2.0/5.2.0/gcc_64/lib/libQt5Core.so.5.2.0)
> ==22064==    by 0x5B16F33: QApplicationPrivate::notify_helper(QObject*,
> QEvent*) (in /opt/Qt5.2.0/5.2.0/gcc_64/lib/libQt5Widgets.so.5.2.0)
> ==22064==    by 0x5B1A50D: QApplication::notify(QObject*, QEvent*) (in
> /opt/Qt5.2.0/5.2.0/gcc_64/lib/libQt5Widgets.so.5.2.0)
> ==22064==    by 0x6B23553: QCoreApplication::notifyInternal(QObject*,
> QEvent*) (in /opt/Qt5.2.0/5.2.0/gcc_64/lib/libQt5Core.so.5.2.0)
> ==22064==    by 0x6B25E08:
> QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) (in
> /opt/Qt5.2.0/5.2.0/gcc_64/lib/libQt5Core.so.5.2.0)
> ==22064==    by 0x6B73B82: ??? (in
> /opt/Qt5.2.0/5.2.0/gcc_64/lib/libQt5Core.so.5.2.0)
> ==22064==    by 0x83A43B5: g_main_context_dispatch (in
> /lib/x86_64-linux-gnu/libglib-2.0.so.0.3800.1)
> ==22064==    by 0x83A4707: ??? (in
> /lib/x86_64-linux-gnu/libglib-2.0.so.0.3800.1)
> ==22064==  Address 0x13b07288 is 8 bytes inside a block of size 16 free'd
> ==22064==    at 0x4C2BADC: operator delete(void*) (in
> /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
> ==22064==    by 0x5074AB9: ??? (in
> /opt/Qt5.2.0/5.2.0/gcc_64/lib/libQt5Quick.so.5.2.0)

These here. What deleted the pointer?

> ==22064==    by 0x5074F02: ??? (in
> /opt/Qt5.2.0/5.2.0/gcc_64/lib/libQt5Quick.so.5.2.0)
> ==22064==    by 0x50EAFEF: ??? (in
> /opt/Qt5.2.0/5.2.0/gcc_64/lib/libQt5Quick.so.5.2.0)
> ==22064==    by 0x55DD022: QQmlPropertyPrivate::write(QObject*,
> QQmlPropertyData const&, QVariant const&, QQmlContextData*,
> QFlags<QQmlPropertyPrivate::WriteFlag>) (in
> /opt/Qt5.2.0/5.2.0/gcc_64/lib/libQt5Qml.so.5.2.0)
> ==22064==    by 0x55DEB32:
> QQmlPropertyPrivate::writeValueProperty(QObject*, QQmlPropertyData const&,
> QVariant const&, QQmlContextData*, QFlags<QQmlPropertyPrivate::WriteFlag>)
> (in /opt/Qt5.2.0/5.2.0/gcc_64/lib/libQt5Qml.so.5.2.0)
> ==22064==    by 0x55DF174: QQmlPropertyPrivate::writeBinding(QObject*,
> QQmlPropertyData const&, QQmlContextData*, QQmlJavaScriptExpression*,
> QV4::ValueRef, bool, QFlags<QQmlPropertyPrivate::WriteFlag>) (in
> /opt/Qt5.2.0/5.2.0/gcc_64/lib/libQt5Qml.so.5.2.0)
> ==22064==    by 0x5684169:
> QQmlBinding::update(QFlags<QQmlPropertyPrivate::WriteFlag>) (in
> /opt/Qt5.2.0/5.2.0/gcc_64/lib/libQt5Qml.so.5.2.0)
> ==22064==    by 0x56844DD:
> QQmlBinding::expressionChanged(QQmlJavaScriptExpression*) (in
> /opt/Qt5.2.0/5.2.0/gcc_64/lib/libQt5Qml.so.5.2.0)
> ==22064==    by 0x565AE46: QQmlNotifier::emitNotify(QQmlNotifierEndpoint*,
> void**) (in /opt/Qt5.2.0/5.2.0/gcc_64/lib/libQt5Qml.so.5.2.0)
> ==22064==    by 0x55CA1CB:
> QQmlData::signalEmitted(QAbstractDeclarativeData*, QObject*, int, void**)
> (in /opt/Qt5.2.0/5.2.0/gcc_64/lib/libQt5Qml.so.5.2.0)
> ==22064==    by 0x6B4C126: QMetaObject::activate(QObject*, int, int,
> void**) (in /opt/Qt5.2.0/5.2.0/gcc_64/lib/libQt5Core.so.5.2.0)

-- 
Thiago Macieira - thiago.macieira (AT) intel.com
  Software Architect - Intel Open Source Technology Center
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