[issue37137] test_asyncio: test_cancel_gather_2() dangling thread

[STINNER Victor]

STINNER Victor <vstinner at redhat.com> added the comment:

AMD64 Ubuntu Shared 3.x:
https://buildbot.python.org/all/#/builders/141/builds/1912

test_proc_exited (test.test_asyncio.test_subprocess.SubprocessTransportTests) ... Warning -- threading_cleanup() failed to cleanup -1 threads (count: 0, dangling: 1)
test_close (test.test_asyncio.test_unix_events.SafeChildWatcherTests) ... /srv/buildbot/buildarea/3.x.bolen-ubuntu/build/Lib/asyncio/base_events.py:646: ResourceWarning: unclosed event loop <_UnixSelectorEventLoop running=False closed=False debug=False>
  _warn(f"unclosed event loop {self!r}", ResourceWarning, source=self)
ResourceWarning: Enable tracemalloc to get the object allocation traceback

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<https://bugs.python.org/issue37137>
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