This relates to pytest – Windows fatal exception: code 0x8001010d but i narrowed the error down to the simplest program.

from PyQt5 import QtWidgets

q_app = QtWidgets.QApplication([])

def test_widget():
    w = QtWidgets.QWidget()
    w.show()
    q_app.processEvents()

Running test_widget with pytest passes, but it also displays a Windows fatal exception: code 0x8001010d on the line q_app.processEvents().

The answer in pytest – Windows fatal exception: code 0x8001010d recommends to ignore the error display using faulthandler.disable(), but rather than ignoring the error, can’t we understand and avoid it?!

I am using python 3.9.12, PyQt5 5.15.7 and latest pytest 8.2.1.