[3.15] gh-146452: Improve locking granularity in pickle's batch_dict_exact and fix race condition (GH-150025)#150039
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…xact and fix race condition (pythonGH-150025) Remove assertion that could fail in rare race condition. Replace the coarse critical section wrapping the entire function with fine-grained sections covering only PyDict_Next + Py_INCREF. Also handle PyDict_Next returning 0 in the single-item fast path. (cherry picked from commit 57a0e57) Co-authored-by: Saul Cooperman <58375603+scopreon@users.noreply.github.com>
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This was referenced May 18, 2026
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Remove assertion that could fail in rare race condition.
Replace the coarse critical section wrapping the entire function with
fine-grained sections covering only PyDict_Next + Py_INCREF.
Also handle PyDict_Next returning 0 in the single-item fast path.
(cherry picked from commit 57a0e57)
Co-authored-by: Saul Cooperman 58375603+scopreon@users.noreply.github.com