Flake8 hangs on a windows machine with > 61 procs when running on > 1 file #1965
Description
how did you install flake8?
D:\temp>uv venv flake8
Using CPython 3.10.15
Creating virtual environment at: flake8
Activate with: flake8\Scripts\activate
D:\temp>flake8\Scripts\activate
(flake8) D:\temp>uv pip install flake8
Using Python 3.10.15 environment at: flake8
Resolved 4 packages in 85ms
Prepared 4 packages in 110ms
░░░░░░░░░░░░░░░░░░░░ [0/4] Installing wheels...
Installed 4 packages in 115ms
+ flake8==7.1.1
+ mccabe==0.7.0
+ pycodestyle==2.12.1
+ pyflakes==3.2.0unmodified output of flake8 --bug-report
{
"platform": {
"python_implementation": "CPython",
"python_version": "3.10.15",
"system": "Windows"
},
"plugins": [
{
"plugin": "mccabe",
"version": "0.7.0"
},
{
"plugin": "pycodestyle",
"version": "2.12.1"
},
{
"plugin": "pyflakes",
"version": "3.2.0"
}
],
"version": "7.1.1"
}describe the problem
what I expected to happen
Flake8 should run and exit with defaults from the command line
Runs/does not exit (hangs after printing stack trace):
(flake8) D:\temp>flake8 testit0.py testit1.py
Exception in thread Thread-1 (_handle_workers):
Traceback (most recent call last):
File "lib\threading.py", line 1016, in _bootstrap_inner
self.run()
File "lib\threading.py", line 953, in run
self._target(*self._args, **self._kwargs)
File "lib\multiprocessing\pool.py", line 522, in _handle_workers
cls._wait_for_updates(current_sentinels, change_notifier)
File "lib\multiprocessing\pool.py", line 502, in _wait_for_updates
wait(sentinels, timeout=timeout)
File "lib\multiprocessing\connection.py", line 879, in wait
ready_handles = _exhaustive_wait(waithandle_to_obj.keys(), timeout)
File "lib\multiprocessing\connection.py", line 811, in _exhaustive_wait
res = _winapi.WaitForMultipleObjects(L, False, timeout)
ValueError: need at most 63 handles, got a sequence of length 194 # <-- hangs hereRuns/exits (does NOT hang) when constrained to 61 jobs:
(flake8) D:\temp>flake8 testit0.py testit1.py --jobs 61