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[3.15] gh-159739: Skip context watchers cleared during notification (GH-160164) - #160291
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…ythonGH-160164) A context watcher callback can clear a later watcher while a context-switch notification is being dispatched. The dispatcher still uses its earlier snapshot of active watchers, so it calls a NULL callback and crashes; check that each callback is still registered before invoking it. Backport to 3.15 and 3.14. (cherry picked from commit 0a57626) Co-authored-by: Jelle Zijlstra <jelle@openai.com>
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A context watcher callback can clear a later watcher while a context-switch notification is being dispatched. The dispatcher still uses its earlier snapshot of active watchers, so it calls a NULL callback and crashes; check that each callback is still registered before invoking it. Backport to 3.15 and 3.14.
(cherry picked from commit 0a57626)
Co-authored-by: Jelle Zijlstra jelle@openai.com