[3.10] bpo-42972: Fully support GC for _winapi.Overlapped (GH-26381)

[miss-islington]

(cherry picked from commit 0fa282c)

Co-authored-by: Ken Jin 28750310+Fidget-Spinner@users.noreply.github.com

https://bugs.python.org/issue42972

[miss-islington]

@Fidget-Spinner and @vstinner: Status check is done, and it's a success ✅ .

[vstinner]

LGTM, good bot.

[miss-islington]

@Fidget-Spinner and @vstinner: Status check is done, and it's a success ❌ .

[Fidget-Spinner]

Errors:

2021-05-28T09:19:40.5802159Z 3 tests failed: 2021-05-28T09:19:40.5802633Z test_asyncio test_httplib test_importlib 

asyncio's logs, these tests are known to be flaky and reported somewhere on bpo:

2021-05-28T09:18:08.9401293Z FAIL: test_sendfile_close_peer_in_the_middle_of_receiving (test.test_asyncio.test_sendfile.ProactorEventLoopTests) 2021-05-28T09:18:08.9402357Z ---------------------------------------------------------------------- 2021-05-28T09:18:08.9402931Z Traceback (most recent call last): 2021-05-28T09:18:08.9403749Z File "D:\a\cpython\cpython\lib\test\test_asyncio\test_sendfile.py", line 457, in test_sendfile_close_peer_in_the_middle_of_receiving 2021-05-28T09:18:08.9405206Z with self.assertRaises(ConnectionError): 2021-05-28T09:18:08.9405959Z AssertionError: ConnectionError not raised 

test_importlib errors: I've never seen this one before

2021-05-28T09:16:08.2062616Z ====================================================================== 2021-05-28T09:16:08.2063656Z FAIL: test_multiprocessing_pool_circular_import (test.test_importlib.test_threaded_import.ThreadedImportTests) 2021-05-28T09:16:08.2064777Z ---------------------------------------------------------------------- 2021-05-28T09:16:08.2065427Z Traceback (most recent call last): 2021-05-28T09:16:08.2066366Z File "D:\a\cpython\cpython\lib\test\test_importlib\test_threaded_import.py", line 258, in test_multiprocessing_pool_circular_import 2021-05-28T09:16:08.2067891Z script_helper.assert_python_ok(fn) 2021-05-28T09:16:08.2068847Z File "D:\a\cpython\cpython\lib\test\support\script_helper.py", line 160, in assert_python_ok 2021-05-28T09:16:08.2069688Z return _assert_python(True, *args, **env_vars) 2021-05-28T09:16:08.2070645Z File "D:\a\cpython\cpython\lib\test\support\script_helper.py", line 145, in _assert_python 2021-05-28T09:16:08.2071564Z res.fail(cmd_line) 2021-05-28T09:16:08.2072242Z File "D:\a\cpython\cpython\lib\test\support\script_helper.py", line 72, in fail 2021-05-28T09:16:08.2073008Z raise AssertionError("Process return code is %d\n" 2021-05-28T09:16:08.2073741Z AssertionError: Process return code is 3221225477 2021-05-28T09:16:08.2075029Z command line: ['D:\\a\\cpython\\cpython\\PCbuild\\amd64\\python.exe', '-X', 'faulthandler', '-I', 'D:\\a\\cpython\\cpython\\lib\\test\\test_importlib\\partial\\pool_in_threads.py'] 2021-05-28T09:16:08.2075868Z 2021-05-28T09:16:08.2076267Z stdout: 2021-05-28T09:16:08.2076663Z --- 2021-05-28T09:16:08.2076929Z 2021-05-28T09:16:08.2077459Z --- 2021-05-28T09:16:08.2077744Z 2021-05-28T09:16:08.2078110Z stderr: 2021-05-28T09:16:08.2078492Z --- 2021-05-28T09:16:08.2078789Z 2021-05-28T09:16:08.2079162Z --- 2021-05-28T09:16:08.2079440Z 2021-05-28T09:16:08.2080183Z ---------------------------------------------------------------------- 

httplib errors, this is already mentioned here https://bugs.python.org/issue44252:

2021-05-28T09:15:10.7551568Z Windows fatal exception: access violation 2021-05-28T09:15:10.7552292Z 0:03:29 load avg: 4.33 [231/427/1] test_httplib crashed (Exit code 3221225477) 2021-05-28T09:15:10.7575556Z 2021-05-28T09:15:10.8138347Z Current thread 0x00001558 (most recent call first): 2021-05-28T09:15:10.8596401Z File "D:\a\cpython\cpython\lib\ssl.py", line 1072 in _create 2021-05-28T09:15:10.8608169Z File "D:\a\cpython\cpython\lib\ssl.py", line 518 in wrap_socket 2021-05-28T09:15:10.8616549Z File "D:\a\cpython\cpython\lib\test\ssl_servers.py", line 37 in get_request 2021-05-28T09:15:10.8931572Z File "D:\a\cpython\cpython\lib\socketserver.py", line 311 in _handle_request_noblock 2021-05-28T09:15:10.9022362Z File "D:\a\cpython\cpython\lib\socketserver.py", line 237 in serve_forever 2021-05-28T09:15:10.9068369Z File "D:\a\cpython\cpython\lib\test\ssl_servers.py", line 142 in run 2021-05-28T09:15:10.9087982Z File "D:\a\cpython\cpython\lib\threading.py", line 1006 in _bootstrap_inner 2021-05-28T09:15:10.9127252Z File "D:\a\cpython\cpython\lib\threading.py", line 963 in _bootstrap 2021-05-28T09:15:10.9768277Z 2021-05-28T09:15:11.1399522Z Thread 0x0000058c (most recent call first): 2021-05-28T09:15:11.1537467Z File "D:\a\cpython\cpython\lib\socket.py", line 496 in _real_close 2021-05-28T09:15:11.1876364Z File "D:\a\cpython\cpython\lib\ssl.py", line 1330 in _real_close 2021-05-28T09:15:11.3695982Z File "D:\a\cpython\cpython\lib\socket.py", line 502 in close 2021-05-28T09:15:11.3743399Z File "D:\a\cpython\cpython\lib\ssl.py", line 1072 in _create 

I have a feeling it's unrelated but I'm going to be cautious here - _winapi.Overlapped is used by asyncio on Windows so there's a chance. Gonna re-run the CI one more time. If it fails again then I'll start investigating.

[Fidget-Spinner]

Dang I forgot miss-islington auto deletes backports when I close them :(. Sorry I'll make it backport again.

[vstinner]

test_httplib crash is unrelated: https://bugs.python.org/issue44252

test_importlib: test_multiprocessing_pool_circular_import(): I wasn't aware of this crash, it sounds unrelated. Likely a random crash.

test_asyncio: test_sendfile_close_peer_in_the_middle_of_receiving(): it's also known and unrelated: https://bugs.python.org/issue41682