An example as simple as the following generates a warning for a binding loop on fill:

import QtQuick 2.4
import QtQuick.Controls 1.3

ApplicationWindow {
    title: "test window"
    width: 500
    height: 500
    visible: true

    TextArea {
        wrapMode: TextEdit.NoWrap
    }
}

The exact warning is:

[..]/mingw492_32/qml/QtQuick/Controls/ScrollView.qml:340:13: QML Item: Possible anchor loop detected on fill.

Setting width/height does not improve the result (as well as setting anchors). It seems that everything is related to the value "TextEdit.NoWrap" since by removing it the warning simply disappears.

A possible workaround is to set the "wrapMode" property in the "Component.onCompleted" handler.