- A stop() landing while the final diagnostics (critical log,
traceback dump) are executing could still reach os._exit(75) after
the pre-diagnostic check. Add a third stop_event recheck immediately
before the hard exit: diagnostics may complete, but a disarmed
watchdog never exits.
- Deterministic regressions for both windows (stop triggered from
inside logger.critical and from inside faulthandler.dump_traceback);
mutation-verified (removing the check turns both red). Frozen-loop
semantics unchanged.
Addresses the second round of the shutdown-race review on #69164.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Josh Tsai
df03120cb6