ValueError: I/O operation on closed file

[bnomis]

This is a follow-up to this issue #11439

Now the exception comes from sys.__stderr__.fileno()

Maybe it would be better to stash the original value of stderr and use that in unconfigure rather than trying to get it by calling fileno()? Happy to supply a patch.

Traceback (most recent call last):
  File "/home/venv3.9/lib/python3.9/site-packages/_pytest/faulthandler.py", line 47, in get_stderr_fileno
    fileno = sys.stderr.fileno()
ValueError: I/O operation on closed file

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/venv3.9/bin/pytest", line 8, in <module>
    sys.exit(console_main())
  File "/home/venv3.9/lib/python3.9/site-packages/_pytest/config/__init__.py", line 192, in console_main
    code = main()
  File "/home/venv3.9/lib/python3.9/site-packages/_pytest/config/__init__.py", line 169, in main
    ret: Union[ExitCode, int] = config.hook.pytest_cmdline_main(
  File "/home/venv3.9/lib/python3.9/site-packages/pluggy/_hooks.py", line 493, in __call__
    return self._hookexec(self.name, self._hookimpls, kwargs, firstresult)
  File "/home/venv3.9/lib/python3.9/site-packages/pluggy/_manager.py", line 115, in _hookexec
    return self._inner_hookexec(hook_name, methods, kwargs, firstresult)
  File "/home/venv3.9/lib/python3.9/site-packages/pluggy/_callers.py", line 113, in _multicall
    raise exception.with_traceback(exception.__traceback__)
  File "/home/venv3.9/lib/python3.9/site-packages/pluggy/_callers.py", line 77, in _multicall
    res = hook_impl.function(*args)
  File "/home/venv3.9/lib/python3.9/site-packages/_pytest/main.py", line 318, in pytest_cmdline_main
    return wrap_session(config, _main)
  File "/home/venv3.9/lib/python3.9/site-packages/_pytest/main.py", line 313, in wrap_session
    config._ensure_unconfigure()
  File "/home/venv3.9/lib/python3.9/site-packages/_pytest/config/__init__.py", line 1058, in _ensure_unconfigure
    self.hook.pytest_unconfigure(config=self)
  File "/home/venv3.9/lib/python3.9/site-packages/pluggy/_hooks.py", line 493, in __call__
    return self._hookexec(self.name, self._hookimpls, kwargs, firstresult)
  File "/home/venv3.9/lib/python3.9/site-packages/pluggy/_manager.py", line 115, in _hookexec
    return self._inner_hookexec(hook_name, methods, kwargs, firstresult)
  File "/home/venv3.9/lib/python3.9/site-packages/pluggy/_callers.py", line 113, in _multicall
    raise exception.with_traceback(exception.__traceback__)
  File "/home/venv3.9/lib/python3.9/site-packages/pluggy/_callers.py", line 77, in _multicall
    res = hook_impl.function(*args)
  File "/home/venv3.9/lib/python3.9/site-packages/_pytest/faulthandler.py", line 42, in pytest_unconfigure
    faulthandler.enable(file=get_stderr_fileno())
  File "/home/venv3.9/lib/python3.9/site-packages/_pytest/faulthandler.py", line 57, in get_stderr_fileno
    return sys.__stderr__.fileno()
ValueError: I/O operation on closed file

Environment

Python 	3.9.10
Platform 	Linux-5.4.226-129.415.amzn2.x86_64-x86_64-with-glibc2.31
Packages 	

    pytest: 7.4.3
    pluggy: 1.3.0

Plugins 	

    Faker: 19.6.2
    anyio: 4.0.0
    cov: 4.1.0
    csv: 3.0.0
    django: 4.5.2
    factoryboy: 2.5.1
    flake8: 1.1.1
    html: 4.0.2
    icdiff: 0.7
    instafail: 0.5.0
    isort: 3.1.0
    metadata: 3.0.0
    mock: 3.11.1
    mypy: 0.10.3
    ordering: 0.6
    randomly: 3.15.0
    subprocess: 1.5.0
    timeout: 2.1.0
    xdist: 3.3.1
    typeguard: 2.13.3

[martimors]

Seeing this whenever calling pytest from inside the code https://docs.pytest.org/en/7.4.x/how-to/usage.html#calling-pytest-from-python-code . It still exits with the correct exit code but the stack trace looks terrifying

Nevermind, the issue here was setting up the logger twice by mistake.