[issue44895] refleak test failure in test_exceptions

[STINNER Victor]

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

> It could be a problem with the way _Py_RefTotal is incremented/decremented.

It can be a cache which is kept alive and then clear the following iteration. See my previous comment:

test leaked [-4, 4, -4, 4, -4, 4, -4, 4, -4, 4, -4, 4, -4, 4, -4, 4, -4, 4, -4, 4] references, sum=0

libregrtest/refleak.py does its best to clear *all* caches, type caches, free lists, etc. A single cache which is not cleared can confused libregrtest.

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<https://bugs.python.org/issue44895>
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