Python segfaults when connecting to a signal attribute of a temporary object; e.g.

tv = QTreeView()
...
tv.selectionModel().destroyed.connect(callback)

What happens is a PyObject* is created for the selection model, but is destroyed after its 'destroyed' attribute is gotten and before the .connect(callback) call.

It may not segfault in a non-debug python build because the recently freed memory may still contain its old values