RecursionError on Python 3.6+3.7 with flake8 5.0.3 #1650
Description
how did you install flake8?
$ pip install --upgrade --upgrade-strategy eager -r dev-requirements.txt
In dev-requirements.txt:
flake8>=3.8.0; python_version == '2.7'
flake8>=3.8.0,<3.9.0; python_version == '3.4'
flake8>=3.8.0; python_version >= '3.5' and python_version <= '3.9'
flake8>=4.0.0; python_version >= '3.10'unmodified output of flake8 --bug-report
{
"platform": {
"python_implementation": "CPython",
"python_version": "3.7.13",
"system": "Darwin"
},
"plugins": [
{
"plugin": "mccabe",
"version": "0.7.0"
},
{
"plugin": "pycodestyle",
"version": "2.9.0"
},
{
"plugin": "pyflakes",
"version": "2.5.0"
}
],
"version": "5.0.3"
}describe the problem
what I expected to happen
flake8 succeeds with no issues
sample code
The issue happens on only some of our projects, and only on Python 3.6 and 3.7. On all projects where it fails, it does not fail on Python 3.8 or higher.
I saw the issue first with flake8 5.0.0 and also with 5.0.3 (did not check versions in between).
It can be reproduced for example in the https://github.com/pywbem/nocaselist project with these commands on Linux or MacOS:
git clone https://github.com/pywbem/nocaselist.git
cd nocaselist
mkvirtualenv -p python3.7 py37
make develop
make check # invokes flake8 and reproduces the failureflake8 command and output showing the failure:
flake8 --statistics --config=.flake8 --filename='*' setup.py nocaselist/_version.py nocaselist/_nocaselist.py nocaselist/__init__.py tests/__init__.py tests/utils/import_installed.py tests/utils/__init__.py tests/utils/simplified_test_function.py tests/unittest/test_package.py tests/unittest/__init__.py tests/unittest/test_nocaselist.py
Traceback (most recent call last):
File "/opt/hostedtoolcache/Python/3.7.13/x64/bin/flake8", line 8, in <module>
sys.exit(main())
File "/opt/hostedtoolcache/Python/3.7.13/x64/lib/python3.7/site-packages/flake8/main/cli.py", line 22, in main
app.run(argv)
File "/opt/hostedtoolcache/Python/3.7.13/x64/lib/python3.7/site-packages/flake8/main/application.py", line 336, in run
self._run(argv)
File "/opt/hostedtoolcache/Python/3.7.13/x64/lib/python3.7/site-packages/flake8/main/application.py", line 325, in _run
self.run_checks()
File "/opt/hostedtoolcache/Python/3.7.13/x64/lib/python3.7/site-packages/flake8/main/application.py", line 229, in run_checks
self.file_checker_manager.run()
File "/opt/hostedtoolcache/Python/3.7.13/x64/lib/python3.7/site-packages/flake8/checker.py", line 250, in run
self.run_parallel()
File "/opt/hostedtoolcache/Python/3.7.13/x64/lib/python3.7/site-packages/flake8/checker.py", line 217, in run_parallel
for ret in pool_map:
File "/opt/hostedtoolcache/Python/3.7.13/x64/lib/python3.7/multiprocessing/pool.py", line 354, in <genexpr>
return (item for chunk in result for item in chunk)
File "/opt/hostedtoolcache/Python/3.7.13/x64/lib/python3.7/multiprocessing/pool.py", line 748, in next
raise value
File "/opt/hostedtoolcache/Python/3.7.13/x64/lib/python3.7/multiprocessing/pool.py", line 431, in _handle_tasks
put(task)
File "/opt/hostedtoolcache/Python/3.7.13/x64/lib/python3.7/multiprocessing/connection.py", line 206, in send
self._send_bytes(_ForkingPickler.dumps(obj))
File "/opt/hostedtoolcache/Python/3.7.13/x64/lib/python3.7/multiprocessing/reduction.py", line 51, in dumps
cls(buf, protocol).dump(obj)
File "/opt/hostedtoolcache/Python/3.7.13/x64/lib/python3.7/collections/__init__.py", line 432, in __getnewargs__
return tuple(self)
RecursionError: maximum recursion depth exceededSee also this GitHub Actions run on the same project: https://github.com/pywbem/nocaselist/runs/7646495550?check_suite_focus=true