[issue42697] 3.8.7rc1 regression: 'free(): invalid pointer' after running backports-zoneinfo test suite

[Michał Górny]

Michał Górny <mgorny at gentoo.org> added the comment:

aeb66c1abbf4ec214e2e80eb972546996d1a1571 is the first bad commit
commit aeb66c1abbf4ec214e2e80eb972546996d1a1571
Author: Miss Skeleton (bot) <31488909+miss-islington at users.noreply.github.com>
Date:   Thu Oct 15 08:51:48 2020 -0700

    bpo-41984: GC track all user classes (GH-22701/GH-22707)
    
    (cherry picked from commit c13b847a6f913b72eeb71651ff626390b738d973)

 Lib/test/test_finalization.py                      | 23 ++++++++++++++++++++--
 Lib/test/test_gc.py                                |  6 +++---
 .../2020-10-14-16-19-43.bpo-41984.SEtKMr.rst       |  2 ++
 Modules/_testcapimodule.c                          | 20 +++++++++++++++++++
 Objects/typeobject.c                               | 22 ++++++---------------
 5 files changed, 52 insertions(+), 21 deletions(-)
 create mode 100644 Misc/NEWS.d/next/Core and Builtins/2020-10-14-16-19-43.bpo-41984.SEtKMr.rst

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<https://bugs.python.org/issue42697>
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