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[3.14] gh-91555: add warning to docs about possibility of deadlock/infinite recursion (GH-135954) by miss-islington · Pull Request #135988 · python/cpython · GitHub

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[3.14] gh-91555: add warning to docs about possibility of deadlock/infinite recursion (GH-135954) #135988

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vsajip merged 1 commit into from
Jun 26, 2025
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[3.14] gh-91555: add warning to docs about possibility of deadlock/infinite recursion (GH-135954) #135988

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9 changes: 9 additions & 0 deletions Doc/library/logging.handlers.rst
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Expand Up @@ -1059,6 +1059,15 @@ possible, while any potentially slow operations (such as sending an email via
.. note:: If you are using :mod:`multiprocessing`, you should avoid using
:class:`~queue.SimpleQueue` and instead use :class:`multiprocessing.Queue`.

.. warning::

The :mod:`multiprocessing` module uses an internal logger created and
accessed via :meth:`~multiprocessing.get_logger`.
:class:`multiprocessing.Queue` will log ``DEBUG`` level messages upon
items being queued. If those log messages are processed by a
:class:`QueueHandler` using the same :class:`multiprocessing.Queue` instance,
it will cause a deadlock or infinite recursion.

.. method:: emit(record)

Enqueues the result of preparing the LogRecord. Should an exception
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