[3.13] GH-91636: Clear weakrefs created by finalizers. (GH-136401)

[sergey-miryanov]

Weakrefs to unreachable garbage that are created during running of finalizers need to be cleared. This avoids exposing objects that have tp_clear called on them to Python-level code. (cherry picked from commit b6b99bf)

• Issue: Assertion failure when func_repr is called on an already tp_clear-ed object #91636

[gpshead]

I think this needs re-applying to 3.14 if we're going to do it for 3.13. it was removed (likely temporarily) from 3.14 as a risk mitigation for 3.14.1 (see issue and prs)

[sergey-miryanov]

I understand. At least we have "working" PR for backporting if we decide so :)

[vstinner]

I think this needs re-applying to 3.14 if we're going to do it for 3.13. it was removed (likely temporarily) from 3.14 as a risk mitigation for 3.14.1 (see issue and prs)

What's the status of this change? Did it land in 3.14 again or not?

[sergey-miryanov]

@hugovk@Yhg1s Should we merge this since 3.14 backport was merged?

[vstinner]

The 3.14 change is #144444?

[sergey-miryanov]

@vstinner Yes.