STINNER Victor <vstin...@python.org> added the comment:

I added the test which leaks in bpo-42846.

commit 07f2cee93f1b619650403981c455f47bfed8d818
Author: Victor Stinner <vstin...@python.org>
Date:   Fri Jan 8 00:15:22 2021 +0100

    bpo-42846: Convert CJK codec extensions to multiphase init (GH-24157)
    
    Convert the 6 CJK codec extension modules (_codecs_cn, _codecs_hk,
    _codecs_iso2022, _codecs_jp, _codecs_kr and _codecs_tw) to the
    multiphase initialization API (PEP 489).
    
    Remove getmultibytecodec() local cache: always import
    _multibytecodec. It should be uncommon to get a codec. For example,
    this function is only called once per CJK codec module.
    
    Fix a reference leak in register_maps() error path.

I don't think that the leak is new. It's just that it wasn't seen previously.

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<https://bugs.python.org/issue42866>
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