[3.12] gh-107471: Fix Refleaks in test_import (gh-107569)#107571
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pythongh-107184 introduced a refleak in test_import.SubinterpImportTests (specifically test_singlephase_check_with_setting_and_override and test_single_init_extension_compat). We fix it here by making sure _testsinglephase is removed from sys.modules whenever we clear the runtime's internal state for the module. The underlying problem is strictly contained in the internal function _PyImport_ClearExtension() (AKA _testinternalcapi.clear_extension()), which is only used in tests. (This also fixes an intermittent segfault introduced in the same place, in test_disallowed_reimport.) (cherry picked from commit 017f047) Co-authored-by: Eric Snow <ericsnowcurrently@gmail.com>
miss-islington requested review from brettcannon, encukou, ericsnowcurrently, ncoghlan and warsaw as code owners This was referenced Aug 2, 2023
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gh-107184 introduced a refleak in test_import.SubinterpImportTests (specifically test_singlephase_check_with_setting_and_override and test_single_init_extension_compat). We fix it here by making sure _testsinglephase is removed from sys.modules whenever we clear the runtime's internal state for the module.
The underlying problem is strictly contained in the internal function _PyImport_ClearExtension() (AKA _testinternalcapi.clear_extension()), which is only used in tests.
(This also fixes an intermittent segfault introduced in the same place, in test_disallowed_reimport.)
(cherry picked from commit 017f047)
Co-authored-by: Eric Snow ericsnowcurrently@gmail.com
test_import#107471