PPC64LE RHEL8 Refleaks 3.9:
https://buildbot.python.org/all/#/builders/482/builds/128

test test_asyncio failed -- Traceback (most recent call last):
  File "/home/buildbot/buildarea/3.9.cstratak-RHEL8-ppc64le.refleak/build/Lib/test/test_asyncio/test_sock_lowlevel.py", line 373, in test_huge_content_recvinto
    self.loop.run_until_complete(
  File "/home/buildbot/buildarea/3.9.cstratak-RHEL8-ppc64le.refleak/build/Lib/asyncio/base_events.py", line 642, in run_until_complete
    return future.result()
  File "/home/buildbot/buildarea/3.9.cstratak-RHEL8-ppc64le.refleak/build/Lib/test/test_asyncio/test_sock_lowlevel.py", line 366, in _basetest_huge_content_recvinto
    self.assertEqual(size, 0)
AssertionError: 978216 != 0


Full output (reformatted for readability):
---
0:22:42 load avg: 10.83 [300/425/1] test_asyncio failed (1 failure) (22 min 40 sec) -- running: (...)
beginning 6 repetitions
123456

Unknown child process pid 201442, will report returncode 255
Loop <_UnixSelectorEventLoop running=False closed=True debug=False> that handles pid 201442 is closed

...

Unknown child process pid 240062, will report returncode 255
Loop <_UnixSelectorEventLoop running=False closed=True debug=False> that handles pid 240062 is closed

.

/home/buildbot/buildarea/3.9.cstratak-RHEL8-ppc64le.refleak/build/Lib/test/support/__init__.py:1468: ResourceWarning: unclosed <socket.socket fd=9, family=AddressFamily.AF_INET, type=SocketKind.SOCK_STREAM, proto=0, laddr=('127.0.0.1', 35628)>
  gc.collect()
ResourceWarning: Enable tracemalloc to get the object allocation traceback

Task exception was never retrieved
future: <Task finished name='Task-17758' coro=<BaseSelectorEventLoop.sock_sendall() done, defined at /home/buildbot/buildarea/3.9.cstratak-RHEL8-ppc64le.refleak/build/Lib/asyncio/selector_events.py:433> exception=ConnectionResetError(104, 'Connection reset by peer')>
Traceback (most recent call last):
  File "/home/buildbot/buildarea/3.9.cstratak-RHEL8-ppc64le.refleak/build/Lib/asyncio/selector_events.py", line 462, in sock_sendall
    return await fut
  File "/home/buildbot/buildarea/3.9.cstratak-RHEL8-ppc64le.refleak/build/Lib/asyncio/selector_events.py", line 470, in _sock_sendall
    n = sock.send(view[start:])
ConnectionResetError: [Errno 104] Connection reset by peer

test test_asyncio failed -- Traceback (most recent call last):
  File "/home/buildbot/buildarea/3.9.cstratak-RHEL8-ppc64le.refleak/build/Lib/test/test_asyncio/test_sock_lowlevel.py", line 373, in test_huge_content_recvinto
    self.loop.run_until_complete(
  File "/home/buildbot/buildarea/3.9.cstratak-RHEL8-ppc64le.refleak/build/Lib/asyncio/base_events.py", line 642, in run_until_complete
    return future.result()
  File "/home/buildbot/buildarea/3.9.cstratak-RHEL8-ppc64le.refleak/build/Lib/test/test_asyncio/test_sock_lowlevel.py", line 366, in _basetest_huge_content_recvinto
    self.assertEqual(size, 0)
AssertionError: 978216 != 0
---


Moreover, test_huge_content_recvinto() seems to change the event loop policy without restoring it once done:
---
0:48:26 load avg: 1.00 Re-running test_asyncio in verbose mode (matching: test_huge_content_recvinto)
beginning 6 repetitions
123456
test_huge_content_recvinto (test.test_asyncio.test_sock_lowlevel.EPollEventLoopTests) ... ok
test_huge_content_recvinto (test.test_asyncio.test_sock_lowlevel.PollEventLoopTests) ... ok
test_huge_content_recvinto (test.test_asyncio.test_sock_lowlevel.SelectEventLoopTests) ... ok

----------------------------------------------------------------------

Ran 3 tests in 0.367s

OK
test_huge_content_recvinto (test.test_asyncio.test_sock_lowlevel.EPollEventLoopTests) ... ok
test_huge_content_recvinto (test.test_asyncio.test_sock_lowlevel.PollEventLoopTests) ... ok
test_huge_content_recvinto (test.test_asyncio.test_sock_lowlevel.SelectEventLoopTests) ... ok

----------------------------------------------------------------------

Ran 3 tests in 0.363s

OK
test_huge_content_recvinto (test.test_asyncio.test_sock_lowlevel.EPollEventLoopTests) ... ok
test_huge_content_recvinto (test.test_asyncio.test_sock_lowlevel.PollEventLoopTests) ... ok
test_huge_content_recvinto (test.test_asyncio.test_sock_lowlevel.SelectEventLoopTests) ... ok

----------------------------------------------------------------------

Ran 3 tests in 0.402s

OK
test_huge_content_recvinto (test.test_asyncio.test_sock_lowlevel.EPollEventLoopTests) ... ok
test_huge_content_recvinto (test.test_asyncio.test_sock_lowlevel.PollEventLoopTests) ... ok
test_huge_content_recvinto (test.test_asyncio.test_sock_lowlevel.SelectEventLoopTests) ... ok

----------------------------------------------------------------------

Ran 3 tests in 0.338s

OK
test_huge_content_recvinto (test.test_asyncio.test_sock_lowlevel.EPollEventLoopTests) ... ok
test_huge_content_recvinto (test.test_asyncio.test_sock_lowlevel.PollEventLoopTests) ... ok
test_huge_content_recvinto (test.test_asyncio.test_sock_lowlevel.SelectEventLoopTests) ... ok

----------------------------------------------------------------------

Ran 3 tests in 0.332s

OK
test_huge_content_recvinto (test.test_asyncio.test_sock_lowlevel.EPollEventLoopTests) ... ok
test_huge_content_recvinto (test.test_asyncio.test_sock_lowlevel.PollEventLoopTests) ... ok
test_huge_content_recvinto (test.test_asyncio.test_sock_lowlevel.SelectEventLoopTests) ... ok

----------------------------------------------------------------------

Ran 3 tests in 0.384s

OK
......
Warning -- asyncio.events._event_loop_policy was modified by test_asyncio
  Before: None
  After:  <asyncio.unix_events._UnixDefaultEventLoopPolicy object at 0x7fff9de7a1e0> 
1 test failed again:
    test_asyncio
---