ColorOverlay causing segmentation fault

Kyeiv · wrote on 9 Apr 2020, 13:21

Hello, developing an ColumnLayout with labels preceded by icons i stumbled upon an strange issue:

Code below works fine and as i want which is drawing a column of icon + text records. But unfortunately when i quit the application it crashes on destructor of class exporting QML classes from C++ (callstack below).

I figured out that commenting out ScalingIcon's ColorOverlay is solving the issue, why i that and ow can i fix it?

ScalingIcon.qml

Image {
    id: root
    property int size: 24  // default
    property real scalingFactor: 1

    sourceSize.width: size * scalingFactor
    sourceSize.height: size * scalingFactor

    ColorOverlay {
        id: colorOverlay
        anchors.fill: root
        source: root
        color: "white"
    }
}

myWidget.qml

	Component
	{
		id: overlayIconItem

		Row
		{
			ScalingIcon
			{
				id: scalingIcon
            	                source: "myIcon.svg"
				size: label.font.pixelSize
			}

			Label
			{
				id: label

				text: "sample Text"

				color: "white"
				wrapMode: Text.Wrap

				style: Text.Outline
				styleColor: "black"

				Component.onCompleted:
				{
					font.weight = Font.Bold
					font.pixelSize = 24
				}

				Rectangle
				{
					z: -1
					opacity: 0.25
					color: "grey"
					height: parent.contentHeight
					width: parent.contentWidth
					radius: 2
				}
			}
		}

	}

ColumnLayout{
Loader
{
	sourceComponent: overlayIconItem
}
...
}

#0  0x00007ffff3d4d205 in QQuickWindow::mouseGrabberItem() const ()
    at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#1  0x00007ffff3d4f8a4 in QQuickWindowPrivate::removeGrabber(QQuickItem*, bool, bool) ()
    at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#2  0x00007ffff3d3d370 in QQuickItemPrivate::derefWindow() ()
    at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#3  0x00007ffff3d3d8d7 in QQuickItem::setParentItem(QQuickItem*) ()
    at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#4  0x00007ffff3d3e34c in QQuickItem::~QQuickItem() () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#5  0x00007ffff3d5a36d in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#6  0x00007ffff295b13b in QObjectPrivate::deleteChildren() ()
    at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007ffff296496b in QObject::~QObject() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007ffff3d3e455 in QQuickItem::~QQuickItem() () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#9  0x00007ffff3d5aff5 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#10 0x00007ffff295b13b in QObjectPrivate::deleteChildren() ()
    at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#11 0x00007ffff296496b in QObject::~QObject() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#12 0x00007ffff3d3e455 in QQuickItem::~QQuickItem() () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#13 0x00007fff97a48738 in  ()
    at /usr/lib/x86_64-linux-gnu/qt5/qml/QtQuick/Layouts/libqquicklayoutsplugin.so
#14 0x00007fff97a44460 in  ()
    at /usr/lib/x86_64-linux-gnu/qt5/qml/QtQuick/Layouts/libqquicklayoutsplugin.so
#15 0x00007ffff295b13b in QObjectPrivate::deleteChildren() ()
    at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#16 0x00007ffff296496b in QObject::~QObject() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#17 0x00007ffff3d3e455 in QQuickItem::~QQuickItem() () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#18 0x00007fff97a48738 in  ()
    at /usr/lib/x86_64-linux-gnu/qt5/qml/QtQuick/Layouts/libqquicklayoutsplugin.so
#19 0x00007fff97a44320 in  ()
    at /usr/lib/x86_64-linux-gnu/qt5/qml/QtQuick/Layouts/libqquicklayoutsplugin.so
#20 0x00007ffff295b13b in QObjectPrivate::deleteChildren() ()
    at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#21 0x00007ffff296496b in QObject::~QObject() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#22 0x00007ffff3d3e455 in QQuickItem::~QQuickItem() () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#23 0x00007ffff3d5a765 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#24 0x00007ffff295b13b in QObjectPrivate::deleteChildren() ()
    at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#25 0x00007ffff296496b in QObject::~QObject() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#26 0x00007ffff3d3e455 in QQuickItem::~QQuickItem() () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#27 0x00007ffff3d598f5 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#28 0x00007ffff295b13b in QObjectPrivate::deleteChildren() ()
    at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#29 0x00007ffff296496b in QObject::~QObject() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#30 0x00007ffff3796b9b in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#31 0x00007ffff295b13b in QObjectPrivate::deleteChildren() ()
---Type <return> to continue, or q <return> to quit---
    at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#32 0x00007ffff296496b in QObject::~QObject() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#33 0x00007ffff3796b9b in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#34 0x00007ffff295b13b in QObjectPrivate::deleteChildren() ()
    at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#35 0x00007ffff296496b in QObject::~QObject() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#36 0x00007ffff3796b9b in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#37 0x00005555570ba57e in std::default_delete<QObject>::operator()(QObject*) const (this=0x5555631a45d8, __ptr=0x555563374e30) at /usr/include/c++/7/bits/unique_ptr.h:78
#38 0x00005555570af6c3 in std::unique_ptr<QObject, std::default_delete<QObject> >::~unique_ptr() (this=0x5555631a45d8, __in_chrg=<optimized out>) at /usr/include/c++/7/bits/unique_ptr.h:263