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1. Commits on Oct 20, 2026

   • [3.15] gh-159864: Fix syslog.openlog() crash with concurrent sys.argv changes (GH-159884) (GH-159952)

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   • [3.15] gh-159786: Convert HACL* update() errors in `_hmac` after releasing the lock (GH-159805) (#159825)

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   • [3.15] gh-159811: Raise OpenSSL errors in `_hashlib.HASH` after re-attaching the thread state (GH-159817) (#159927)

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     miss-islington

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     picnixz

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   • [3.15] gh-159739: Propagate macOS proxy conversion errors (GH-159750) (#159934)

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   • [3.15] gh-159739: Preserve the normalization buffer on allocation failure (GH-159755) (#159935)

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     jelle-openai

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   • [3.15] gh-159811: Raise OpenSSL errors in `_hashlib.HMAC` after re-attaching the thread state (GH-159818) (#159926)

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     miss-islington

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   • [3.15] gh-159458: Fix free-threading data race in datetime strftime century normalization (GH-159520) (gh-159536)

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     AnnaAr321

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   • [3.15] gh-158876: Update bundled Expat to 2.9.0 (GH-158881) (#159921)

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   • [3.15] gh-159739: Preserve the full maxlen when copying deque subclasses (GH-159765) (#159896)

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   • [3.15] gh-159739: Track group records for cyclic garbage collection (GH-159778) (#159904)

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   • [3.15] gh-159739: Handle overlapping buffers in BytesIO.readinto (GH-159777) (#159902)

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   • [3.15] gh-159739: Read resized ctypes scalars using their declared size (GH-159767) (#159898)

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   • [3.15] gh-146065: Fix NULL dereference in FutureIter_am_send (GH-158468) (#159870)

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     miss-islington

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     msullivan

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2. Commits on Oct 19, 2026

   • [3.15] gh-159739: Release resources on interpreter startup error paths (GH-159752) (#159793)

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   • [3.15] gh-158973: Reset the warnings lock after fork in the child (gh-158974) (gh-159614)

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     ngoldbaum

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   • [3.15] gh-159739: Release SSL resources on error paths (GH-159745) (#159761)

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   • [3.15] gh-155782: avoid a crash in `ssl.SSLObject.group` for session-less objects (GH-155829) (#159740)

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     miss-islington

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     picnixz

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   • [3.15] gh-155830: properly initialize BLAKE-2 objects before GC tracking (GH-155831) (#159732)

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3. Commits on Oct 17, 2026

   • [3.15] gh-159620: Fix remote asyncio stacks stopping at async generators (GH-159623) (GH-159654)

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4. Commits on Oct 16, 2026

   • [3.15] gh-157364: Fix use-after-free in io.TextIOWrapper during reentrant detach (#159591)

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   • [3.15] gh-158585: Backport test_capi.test_bytes from main (#159588)

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   • [3.15] gh-158451: Add _PyUnicodeWriter_WriteLatin1String() test (#158464) (#159551)

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   • [3.15] gh-158585: Fix _PyBytes_Resize() if hash value is already computed (#159555)

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   • [3.15] gh-157242: Add more PyBytesWriter tests (#159546)

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   • [3.15] gh-158445: Detect invalid UCS4 characters in debug mode (#158502) (#159524)

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   • [3.15] gh-156939: Add tests on the PyUnicode C API (#159533)

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   • [3.15] gh-158445: Add C API tests on build information functions (#159515)

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     StanFromIreland

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5. Commits on Oct 14, 2026

   • [3.15] Set default arguments in _testlimitedcapi/unicode.c (GH-159380) (#159411)

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6. Commits on Oct 13, 2026

   • [3.15] gh-152754: Fix crash when an os.scandir iterator is shared between threads (gh-153462) (gh-159365)

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   • [3.15] gh-151518: Avoid STW starvation of attaching threads (GH-152826) (GH-158186)

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     tpn

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   • [3.15] gh-157242: Do not close io.BytesIO on MemoryError (GH-157344) (#159275)

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     miss-islington

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7. Commits on Oct 12, 2026

   • [3.15] gh-157242: Fix PyBytesWriter_Resize() on MemoryError (#157243) (#159260)

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     maurycy

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   • [3.15] gh-129813: Check size in PyBytesWriter_FinishWithSize() (#157226) (#159261)

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   • [3.15] gh-142083: Document the 'w' type code in the array.array docstring (#158040) (#158575)

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   • [3.15] gh-155621: Fix unrepresentable defaults in socket.sendmsg() signature (GH-155623) (GH-155802)

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     aisk

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     lpyu001

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