[issue37126] test_threading is leaking references

[Pablo Galindo Salgado]

New submission from Pablo Galindo Salgado <pablogsal at gmail.com>:

https://buildbot.python.org/all/#/builders/1/builds/601

OK (skipped=1)
.
test_threading leaked [9770, 9772, 9768] references, sum=29310
test_threading leaked [3960, 3961, 3959] memory blocks, sum=11880
2 tests failed again:
    test_asyncio test_threading

----------
components: Tests
messages: 344191
nosy: pablogsal, vstinner
priority: normal
severity: normal
status: open
title: test_threading is leaking references
versions: Python 3.8

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue37126>
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