New submission from Erik Montnemery <erik.montnem...@gmail.com>:
logging.handlers.QueueHandler logs stack twice when stack_info=True:
>>> import logging
>>> from logging.handlers import QueueHandler, QueueListener
>>> from queue import Queue
>>> q = Queue()
>>> logging.getLogger().addHandler(QueueHandler(q))
>>> listener = QueueListener(q, logging.StreamHandler())
>>> listener.start()
>>> _LOGGER.error("Hello", stack_info=True)
Hello
Stack (most recent call last):
File "<stdin>", line 1, in <module>
Stack (most recent call last):
File "<stdin>", line 1, in <module>
Reproduced on CPython 3.9.9, but the code is unchanged in 3.10 and 3.11, so the
issue should exist there too.
Patching QueueHandler.prepare() to set stack_info to None seems to fix this:
diff --git a/Lib/logging/handlers.py b/Lib/logging/handlers.py
index d42c48de5f..7cd5646d85 100644
--- a/Lib/logging/handlers.py
+++ b/Lib/logging/handlers.py
@@ -1452,6 +1452,7 @@ def prepare(self, record):
record.args = None
record.exc_info = None
record.exc_text = None
+ record.stack_info = None
return record
def emit(self, record):
Related issue: Issue34334, with patch
https://github.com/python/cpython/pull/9537
----------
components: Library (Lib)
messages: 413278
nosy: erik.montnemery
priority: normal
severity: normal
status: open
title: QueueHandler logs stack_info twice
type: behavior
versions: Python 3.9
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue46755>
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