[issue38997] test__xxsubinterpreters test_atexit test_capi test_threading are leaking references

[Pablo Galindo Salgado]

Pablo Galindo Salgado <pablogsal at gmail.com> added the comment:

Bisecting points to:

commit 81fe5bd3d78f9bb955f8255404d99df27a31c36a
Author: Victor Stinner <vstinner at python.org>
Date:   Fri Dec 6 02:43:30 2019 +0100

    bpo-38858: new_interpreter() reuses _PySys_Create() (GH-17481)
    
    new_interpreter() now calls _PySys_Create() to create a new sys
    module isolated from the main interpreter. It now calls
    _PySys_InitCore() and _PyImport_FixupBuiltin().
    
    init_interp_main() now calls _PySys_InitMain().

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<https://bugs.python.org/issue38997>
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