https://github.com/python/cpython/commit/3be3c496df3d2ab48d1c66031b9fc78550b3a2a6
commit: 3be3c496df3d2ab48d1c66031b9fc78550b3a2a6
branch: 3.13
author: Miss Islington (bot) <[email protected]>
committer: vsajip <[email protected]>
date: 2025-06-26T15:26:11+01:00
summary:
[3.13] gh-91555: add warning to docs about possibility of deadlock/infinite
recursion (GH-135954) (GH-135989)
(cherry picked from commit a4625d597f9fc2d083fbb9c22d3ffcec73b2061a)
files:
M Doc/library/logging.handlers.rst
diff --git a/Doc/library/logging.handlers.rst b/Doc/library/logging.handlers.rst
index b48c5cb483dcce..c587052ae9a4a0 100644
--- a/Doc/library/logging.handlers.rst
+++ b/Doc/library/logging.handlers.rst
@@ -1052,6 +1052,15 @@ 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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