[issue40887] Leaks in new free lists

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

I'm curious about this bug, so I looked at code changes.

Before Python 3.6, warnings.c "garbage" is declared as a static variable. It is initialized once but never cleared.

In Python 3.7, the variable moved into _PyRuntimeState.gc.

In Python 3.8, _PyGC_Fini() started to clear the "garbage" list. This function is called by Py_FinalizeEx() *after* PyList_Fini().

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