Bug report: Tests halt on Rocky Linux 8 using PySide6-6.7.1

[itziakos]

Environment

OS: Linux
Python version: 3.11
Toolkit: Qt
Qt API: PySide6 6.7.1

Description

Tests halt on (WSL2) Rocky Linux 8 using PySide6-6.7.1. The test run will resume if the pop up windows are closed but similar errors appear later and the run does not finish.

Steps to Reproduce

edm env create test --version 3.11
edm install -e test PySide6 numpy pygments packaging pillow importlib_resources build wheel
edm run -e test -- pip install traits pyface
edm run -e test -- python -m unittest discover pyface

output

test_set_title_change_active_task (pyface.tasks.tests.test_task_window.TestTaskWindow.test_set_title_change_active_task) ... ok
test_set_title_change_active_task_name (pyface.tasks.tests.test_task_window.TestTaskWindow.test_set_title_change_active_task_name) ... ok
test_set_title_change_title (pyface.tasks.tests.test_task_window.TestTaskWindow.test_set_title_change_title) ... ok
test_set_title_no_active_task (pyface.tasks.tests.test_task_window.TestTaskWindow.test_set_title_no_active_task) ... ok
test_set_title_no_tasks (pyface.tasks.tests.test_task_window.TestTaskWindow.test_set_title_no_tasks) ... ok
test_title_activate_task (pyface.tasks.tests.test_task_window.TestTaskWindow.test_title_activate_task) ... ok
test_title_change_active_task (pyface.tasks.tests.test_task_window.TestTaskWindow.test_title_change_active_task) ... ok
test_title_change_active_task_name (pyface.tasks.tests.test_task_window.TestTaskWindow.test_title_change_active_task_name) ... ok
test_title_change_deactivate_task (pyface.tasks.tests.test_task_window.TestTaskWindow.test_title_change_deactivate_task) ... ok
test_title_default (pyface.tasks.tests.test_task_window.TestTaskWindow.test_title_default) ... ok
test_title_no_active_task (pyface.tasks.tests.test_task_window.TestTaskWindow.test_title_no_active_task) ... ok
test_defaults (pyface.tasks.tests.test_tasks_application.TestApplication.test_defaults) ... ok
test_lifecycle (pyface.tasks.tests.test_tasks_application.TestApplication.test_lifecycle) ... Traceback (most recent call last):
  File "/home/itziakos/.edm/envs/build-env/lib/python3.11/site-packages/pyface/ui/qt/gui.py", line 190, in _dispatch
    self._callable(*self._args, **self._kw)
  File "/home/itziakos/.edm/envs/build-env/lib/python3.11/site-packages/pyface/application.py", line 220, in exit
    self._exit()
  File "/home/itziakos/.edm/envs/build-env/lib/python3.11/site-packages/pyface/gui_application.py", line 236, in _exit
    self.gui.stop_event_loop()
    ^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: '_Undefined' object has no attribute 'stop_event_loop'

[itziakos]

On WSL2 the tests halt but on linux VM they segfault.

[2024-06-12T15:33:10.219Z] b'test_lifecycle (pyface.tasks.tests.test_tasks_application.TestApplication.test_lifecycle) ... Traceback (most recent call last):'
[2024-06-12T15:33:10.220Z] b'  File "/home/builder/.edm/envs/build-env/lib/python3.11/site-packages/pyface/ui/qt/gui.py", line 190, in _dispatch'
[2024-06-12T15:33:10.220Z] b'    self._callable(*self._args, **self._kw)'
[2024-06-12T15:33:10.220Z] b'  File "/home/builder/.edm/envs/build-env/lib/python3.11/site-packages/pyface/application.py", line 220, in exit'
[2024-06-12T15:33:10.220Z] b'    self._exit()'
[2024-06-12T15:33:10.220Z] b'  File "/home/builder/.edm/envs/build-env/lib/python3.11/site-packages/pyface/gui_application.py", line 236, in _exit'
[2024-06-12T15:33:10.220Z] b'    self.gui.stop_event_loop()'
[2024-06-12T15:33:10.220Z] b'    ^^^^^^^^^^^^^^^^^^^^^^^^'
[2024-06-12T15:33:10.220Z] b"AttributeError: '_Undefined' object has no attribute 'stop_event_loop'"
[2024-06-12T15:33:10.220Z] b'FAIL'
[2024-06-12T15:33:10.220Z] b''
[2024-06-12T15:33:10.220Z] b'======================================================================'
[2024-06-12T15:33:10.220Z] b'FAIL: test2_test_pyside6 (__main__.Tests.test2_test_pyside6)'
[2024-06-12T15:33:10.220Z] b'----------------------------------------------------------------------'
[2024-06-12T15:33:10.220Z] b'Traceback (most recent call last):'
[2024-06-12T15:33:10.220Z] b'  File "/home/builder/workspace/Buildsystem/test/new/cp311/pyface-8.0.0/tests/run.py", line 27, in test2_test_pyside6'
[2024-06-12T15:33:10.220Z] b'    self.runpy(args, env=env)'
[2024-06-12T15:33:10.220Z] b'  File "/home/builder/workspace/Buildsystem/test/new/cp311/entest_utils.py", line 469, in runpy'
[2024-06-12T15:33:10.220Z] b'    self.run_test_function('
[2024-06-12T15:33:10.220Z] b'  File "/home/builder/workspace/Buildsystem/test/new/cp311/entest_utils.py", line 546, in run_test_function'
[2024-06-12T15:33:10.220Z] b'    self.fail("unexpected test exit code {!r}".format(ret))'
[2024-06-12T15:33:10.220Z] b'AssertionError: unexpected test exit code -15'
[2024-06-12T15:33:10.220Z] b''
[2024-06-12T15:33:10.220Z] b'----------------------------------------------------------------------'
[2024-06-12T15:33:10.220Z] b'Ran 18 tests in 1180.661s'
[2024-06-12T15:33:10.220Z] b''
[2024-06-12T15:33:10.220Z] b'FAILED (failures=1, skipped=11)'
[2024-06-12T15:33:10.220Z] b'================================================='
[2024-06-12T15:33:10.220Z] b"ENTEST STOP -- TOTAL FAILURES: 1 ('pyface-8.0.0')"