[issue35053] Enhance tracemalloc to trace properly free lists

[STINNER Victor]

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

Even if Python 3.6 and 3.7 are impacted by the bug, I propose to only fix Python 3.8 since the change modifies a _Py_NewReference() function which is critical for performance.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue35053>
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