[issue30536] SubinterpThreadingTests.test_threads_join_2() of test_threading leaks references

[STINNER Victor]

New submission from STINNER Victor:

Ah! I succeeded to hack a tool to bisect -m test -R 3:3 failure (issue #29512, I will publish it later, right now it's too hackish), so I found a first guilty of failure on the Gentoo Refleak failure.

Maybe it's related to recent Eric Snow's work. Maybe not. I didn't dig the bug yet.

haypo at selma$ ./python -m test -R 3:3 -m test_threads_join_2 test_threading
Run tests sequentially
0:00:00 load avg: 0.16 [1/1] test_threading
beginning 6 repetitions
123456
......
test_threading leaked [3, 3, 3] references, sum=9
test_threading failed

1 test failed:
    test_threading

Total duration: 2 sec
Tests result: FAILURE

----------
messages: 294932
nosy: eric.snow, haypo, serhiy.storchaka, zach.ware
priority: normal
severity: normal
status: open
title: SubinterpThreadingTests.test_threads_join_2() of test_threading leaks references
type: resource usage
versions: Python 3.7

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue30536>
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