[issue37137] test_asyncio: test_cancel_gather_2() dangling thread

[STINNER Victor]

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

Another similar error on "ARMv7 Debian buster 3.x" buildbot:
https://buildbot.python.org/all/#/builders/176/builds/664

test_proc_exited (test.test_asyncio.test_subprocess.SubprocessTransportTests) ... Warning -- threading_cleanup() failed to cleanup -1 threads (count: 0, dangling: 1)

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