[3.13] gh-142829: Fix use-after-free in `Context.eq` via re-entrant `ContextVar.set` (GH-142905) (GH-143871)

(cherry picked from commit a4086d7f89e5d388e4ffcdb13e4fba0255234286)

Co-authored-by: A.Ibrahim <abdulrasheedibrahim47@gmail.com>

Serhiy Storchaka committed 4mo ago

149ecbb9a9e6e58a60c83783412de2c8dc0c9db9

Parent: 343b5c4

Committed by GitHub <noreply@github.com> on 1/15/2026, 3:00:44 PM

[3.13] gh-142829: Fix use-after-free in `Context.__eq__` via re-entrant `ContextVar.set` (GH-142905) (GH-143871)