tests/test_inotify_buffer.py tests fail in 1-core-VM

[bmwiedemann]

While working on reproducible builds for openSUSE, I found that our python-watchdog-2.1.3 package failed 1 test when running in a 1-core-VM (usually this happens due to differences in scheduling/timing)

To reproduce

maybe run tests as taskset 1 pytest

or on Debian or openSUSE run

osc checkout openSUSE:Factory/python-watchdog && cd $_
osc build --vm-type=kvm --noservice --clean -j1 standard

Actual behavior

4 test errors

 =========================== short test summary info ============================
 ERROR tests/test_inotify_buffer.py::test_move_to - AssertionError: assert not...
 ERROR tests/test_inotify_buffer.py::test_move_internal - AssertionError: asse...
 ERROR tests/test_inotify_buffer.py::test_move_internal_batch - AssertionError...
 ERROR tests/test_inotify_buffer.py::test_close_should_terminate_thread - Asse...
 =========== 100 passed, 6 skipped, 1 deselected, 4 errors in 29.42s ============

You can find the full build log with errors at https://rb.zq1.de/temp/python-watchdog-j1-buildlog.txt

[BoboTiG]

Attached the log file for history.
python-watchdog-j1-buildlog.txt

---

The issue is not about 1-core, but about OSError: [Errno 9] Bad file descriptor. It is not the first time someone reported such issue 🤔

watchdog/src/watchdog/observers/inotify_c.py

Line 285 in 4ef348b

event_buffer = os.read(self._inotify_fd, event_buffer_size)

[BoboTiG]

I close that issue as duplicate of #805. Thanks for the report @bmwiedemann :)