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1. Commits on Oct 22, 2026

   • [3.15] gh-159111: Update vendored mimalloc to v2.5.2 (gh-159112) (gh-160178)

     corona10

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2. Commits on Oct 19, 2026

   • [3.15] gh-159041: Fix use-after-free in asyncio task tracking during thread state cleanup (GH-159073) (#159694)

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     miss-islington

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     ngoldbaum

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3. Commits on Oct 13, 2026

   • [3.15] Fix _PyThreadState_ResumeDetached() assertion with attach waiters (GH-159372)

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     nascheme

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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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4. Commits on Oct 10, 2026

   • [3.15] gh-155504: Set the interpreter before fallible thread state initialization (GH-155590) (GH-155884)

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     miss-islington

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     abdulm5

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5. Commits on Oct 1, 2026

   • [3.15] gh-142349: Simplify lazy import resolution (GH-158282) (#158569)

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     3 peopleauthored
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6. Commits on Sep 30, 2026

   • [3.15] gh-158364: Don't report other interpreters' threads in `sys._current_frames` (GH-158369) (#158471)

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     miss-islington

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     Himesh-rupchandani

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7. Commits on Sep 29, 2026

   • [3.15] gh-157838: Merge biased refcounts on behalf of detached threads (#157839) (#158011)

     kumaraditya303

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8. Commits on Aug 31, 2026

   • [3.15] gh-155725: Remove `PyGILState_Ensure` usage from `tracemalloc` (GH-156409) (#156628)

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     miss-islington

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     kumaraditya303

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9. Commits on Aug 22, 2026

   • [3.15] gh-155363: Fix QSBR slot leak on thread state creation failure (gh-155365) (#155579)

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10. Commits on Jul 27, 2026

    • [3.15] gh-154431: Revert "gh-154431: Fix data race in `sys.audithook` (GH-154462)" (GH-154769) (GH-154774)

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      miss-islington

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      encukou

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11. Commits on Jul 22, 2026

    • [3.15] gh-154431: Fix data race in `sys.audithook` (GH-154462) (#154477)

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      miss-islington

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      sobolevn

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12. Commits on Jun 30, 2026

    • [3.15] gh-151126: Fix a possible crash during the startup with no memory under `Py_STACKREF_DEBUG` (GH-152478) (#152677)

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      miss-islington

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      sobolevn

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13. Commits on Jun 27, 2026

    • [3.15] gh-151613: Fix remote debugging frame cache ABA (#152448)

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      pablogsal

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14. Commits on May 24, 2026

    • [3.15] gh-149335: Avoid JIT trace buffer asserts with overhead above `FITNESS_INITIAL` (GH-149633) (#150245)

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      miss-islington

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      cocolato

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15. Commits on May 11, 2026

    • [3.15] gh-145235: Make dict watcher API thread-safe for free-threaded builds (gh-145233) (#149690)

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      colesbury

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      yoney

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16. Commits on May 6, 2026

    • gh-149101: Implement PEP 788 (GH-149116)

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      3 peopleauthored
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17. Commits on Apr 24, 2026

    • gh-146073: Add fitness/exit quality mechanism for JIT trace frontend (GH-148089)

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      cocolato

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18. Commits on Apr 23, 2026

    • GH-126910: Build/link the JIT shim in the Python interpreter (#148872)

      diegorusso

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19. Commits on Apr 16, 2026

    • gh-146031: Allow keeping specialization enabled when specifying eval frame function (#146032)

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      DinoV

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20. Commits on Apr 11, 2026

    • gh-146302: make Py_IsInitialized() thread-safe and reflect true init completion (GH-146303)

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      gpshead

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      claude

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21. Commits on Apr 4, 2026

    • gh-146073: Revert "gh-146073: Add fitness/exit quality mechanism for JIT trace frontend (GH-147966)" (#148082)

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      Fidget-Spinner

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22. Commits on Apr 3, 2026

    • gh-146073: Add fitness/exit quality mechanism for JIT trace frontend (GH-147966)

      cocolato

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23. Commits on Mar 27, 2026

    • gh-126910: Verify that JIT stencils preserve frame pointer (GH-146524)

      Fidget-Spinner

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    • GH-126910: avoid reading the FP for getting the SP (GH-146521)

      diegorusso

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24. Commits on Mar 16, 2026

    • gh-127958: Trace from RESUME in the JIT (GH-145905)

      Fidget-Spinner

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    • gh-144888: Replace bloom filter linked lists with continuous arrays to optimize executor invalidating performance (GH-145873)

      cocolato

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25. Commits on Mar 11, 2026

    • gh-142183: Cache one datachunk per tstate to prevent alloc/dealloc thrashing (#145789)

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      Yhg1s

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      blurb-it[bot]

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26. Commits on Jan 24, 2026

    • gh-144068: fix JIT tracer memory leak when daemon thread exits (GH-144077)

      cocolato

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27. Commits on Jan 22, 2026

    • GH-139109: Partial reworking of JIT data structures (GH-144105)

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      markshannon

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28. Commits on Jan 20, 2026

    • gh-141504: Move PYTHON_UOPS_OPTIMIZE to policy object (GH-144082)

      corona10

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29. Commits on Jan 15, 2026

    • gh-141504: Refactor policy object into a single opt_config (gh-143644)

      corona10

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30. Commits on Jan 14, 2026

    • gh-138050: Use cold flag instead of warm flag in `MAKE_WARM` (GH-143827)

      cocolato

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31. Commits on Jan 9, 2026

    • gh-143421: Allocate all JIT state in one go (GH-143626)

      Fidget-Spinner

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    • gh-143421: Lazily allocate tracer code and opt buffers (GH-143597)

      Fidget-Spinner

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