Author vstinner
Recipients christian.heimes, eric.smith, eric.snow, vstinner
Date 2020-11-18.13:51:51
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> The reference leak was introduced in 86ea58149c3 / GH-13159 / bpo-36737. PR GH-20929 fixes it, too.

Usually, it's not that the subinterpreter work introduces new leak, but makes old leak suddenly visible.

The create_filter() leak was introduced way earlier:

commit 9b99747386b690007027c3be2a5d7cfe3d3634f5
Author: Nick Coghlan <>
Date:   Mon Jan 8 12:45:02 2018 +1000

    bpo-31975 (PEP 565): Show DeprecationWarning in __main__ (GH-4458)

It's a minor leak since the create_filter() function is called exactly 5 times at startup. It's a leak of 5 strong references, it's not a big deal :-)
Date User Action Args
2020-11-18 13:51:52vstinnersetrecipients: + vstinner, eric.smith, christian.heimes, eric.snow
2020-11-18 13:51:52vstinnersetmessageid: <>
2020-11-18 13:51:52vstinnerlinkissue40998 messages
2020-11-18 13:51:51vstinnercreate