QDeclarativeView with reference loop

If you point the declarative rootContext to the containing object seemingly creating a reference loop the program seg-faults on exit. The call stack appears to be unchecked recursion. This also seems to create other memory corruption even before the program exit. I include a more complicated example as an attachment illustrating this since I think that's the more worrisome bug.

from PySide import QtCore, QtGui, QtDeclarative

class MainWindow(QtGui.QMainWindow):
    def __init__(self, parent=None):
        super(MainWindow, self).__init__(parent)

        self.declview = QtDeclarative.QDeclarativeView()
        self.setCentralWidget(self.declview)
        self.context = self.declview.rootContext()
        self.context.setContextProperty('controller', self)

    def closeEvent(self, event):
        # This next line clearing the assumed reference loop allows the program
        # to close cleanly.
        #self.context.setContextProperty('controller', None)
        super(MainWindow, self).closeEvent(event)

app = QtGui.QApplication([])
w = MainWindow()
w.show()
app.exec_()

To illustrate the other memory corruption appears to require the Chaco graphing library (although I suspect that's rather incidental). This seems consistent on my system, but I'm not too confident. The code illustrating it is in the attachment. Select "file > other" in the first window and then "file > graph" in the second window that appears. The program will then crash.