QML app chrashes after user-triggered drawImage call

[Andreykonn]

I have this code:

@import QtQuick 2.1
import QtQuick.Controls 1.0

Rectangle {
width: 640
height: 600
id: win
Image
{
id: img
source: "../../../../../Windows/winsxs/x86_setup-uxwizard-clientimages_31bf3856ad364e35_6.1.7600.16385_none_48ada01d8ff36e68/background.bmp"
width:300
height:300
}
Canvas
{
anchors.bottom: parent.bottom
width:300
height:300
id: cnv
onPaint: {
var ctx = cnv.getContext('2d');
ctx.drawImage(img, 0,0,300,300);

    }
}
Button {
    text: 'Do it'
    anchors.centerIn: parent
    onClicked: {
        cnv.requestPaint();
    }
}

}@

drawImage works (though terribly slow) until you request it by requestPaint. Then it just crashes the app. Tested on Windows 7, QT 5.1. Just change Image.source to any available image file.