During Panel tests, it was common to see the following error repeating in the log: QWARN : [...]unity8/qml/Panel/PanelItemRow.qml:168:5: QML ListView: Binding loop detected for property "width" Generally this didn't cause any problems. Occasionally, though, the loop would not be caught and the tests would lock up forever at 100% CPU. To fix this, use the ListView's contentItem rather than childrenRect. This likely should have been the case since the beginning, since the ListView reparents all contained Items to contentItem rather than holding them directly.