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1. Commits on Oct 5, 2026

   • [3.15] Revert backports merged during the 3.15.0 release freeze on 5 October (#158873)

     pablogsal

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   • [3.15] Add MSan to CI (GH-158625) (#158832)

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   • [3.15] gh-154194: Degrade frames in Tachyon instead of failing the sample (GH-154195) (#158831)

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     pablogsal

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     maurycy

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   • [3.15] gh-155811: Add a seqcount to `gc_stats` to prevent torn reads (GH-155828) (#158829)

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2. Commits on Oct 2, 2026

   • [3.15] gh-158140: Resolve lazily imported sibling submodules independently (GH-158521) (#158613)

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     5 peopleauthored
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   • [3.15] gh-155695: Remove resolved names from sys.lazy_modules more consistently (GH-157714) (#158607)

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     4 peopleauthored
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3. Commits on Oct 1, 2026

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

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4. Commits on Sep 30, 2026

   • [3.15] gh-157914: Revert "gh-135871: Reload lock internal state while spinning in `PyMutex_LockTimed` (gh-146064)" (gh-158082) (#158290)

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     miss-islington

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     dpdani

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   • [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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   • [3.15] gh-158446: Reject float format precision near INT_MAX (GH-158474) (#158476)

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     miss-islington

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     gpshead

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5. Commits on Sep 29, 2026

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

     kumaraditya303

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6. Commits on Sep 26, 2026

   • [3.15] gh-157757: Fix to make `lazy import a.b as c` import the module `a.b` (GH-158092) (#158257)

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     pablogsal

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     brittanyrey

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7. Commits on Sep 24, 2026

   • [3.15] gh-152708: Fix AST generation asymmetry for unary positive in match statements (GH-152712) (#158079)

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     4 peopleauthored
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   • [3.15] gh-156689: Fix out-of-bounds read in `PyAst_CheckMode()` for `mode='func_type'` (GH-156697) (#156705)

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     miss-islington

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     StanFromIreland

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8. Commits on Sep 23, 2026

   • [3.15] gh-157247: Block perf trampoline activation when the main interpreter's JIT is enabled (GH-157258) (#157324)

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     miss-islington

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     cocolato

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9. Commits on Sep 19, 2026

   • [3.15] gh-157549: Use sysconf() for the page size in remote_debug.h (GH-157800) (#157813)

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     miss-islington

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     nouraellm

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10. Commits on Sep 18, 2026

    • [3.15] gh-156114: Fix crash in perf trampoline with unencodable code names (GH-156300) (#157773)

      miss-islington

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11. Commits on Sep 15, 2026

    • [3.15] gh-128509: Use bytes singletons in marshal (GH-157398) (#157433)

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      miss-islington

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      vstinner

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12. Commits on Sep 12, 2026

    • [3.15] gh-156126: Fix crash in -X importtime with unencodable module names (GH-156137) (#156259)

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      miss-islington

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      Eclips4

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13. Commits on Aug 31, 2026

    • [3.15] gh-156466: Fix additional compiler scope cleanup errors (GH-156547) (#156571)

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      miss-islington

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      JelleZijlstra

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    • [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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14. Commits on Aug 29, 2026

    • [3.15] gh-156395: Report frozen objects on free-threaded GC build (GH-156396) (#156420)

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      miss-islington

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      DinoV

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    • [3.15] gh-155952: Fix `<unrepresentable>` Argument Clinic defaults in several signatures (GH-155954) (#156165)

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      miss-islington

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      StanFromIreland

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15. Commits on Aug 27, 2026

    • [3.15] gh-148750: Unfreeze encodings module to avoid import errors with zipped stdlib (GH-156183) (#156328)

      zooba

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    • [3.15] gh-156243: Indicate that emscripten_runtime depends on stringToNewUTF8 (GH-156335) (#156383)

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      miss-islington

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      hoodmane

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16. Commits on Aug 26, 2026

    • [3.15] gh-129752: Don't update adaptive counters when TLBC=0 in free-threading. (gh-155497) (#155647)

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      miss-islington

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      corona10

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17. Commits on Aug 25, 2026

    • [3.15] gh-154701: prevent executor self-links in JIT cold exits (GH-155323) (#155832)

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18. 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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19. Commits on Aug 19, 2026

    • [3.15] gh-155194: Fix not raising on non-module import (GH-155189) (#155983)

      brittanyrey

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    • [3.15] gh-148817: Fold long lists/sets of constant elements into constant tuples/frozensets (GH-149016) (#155897)

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    • [3.15] gh-155519: fix data-race for Context.ctx_vars (GH-155522) (#155893)

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      miss-islington

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      nascheme

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    • [3.15] gh-85260: Extend the AST Validator to validate all identifiers (GH-21069) (#155652)

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      miss-islington

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      isidentical

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20. Commits on Aug 17, 2026

    • [3.15] gh-155515: Use GC tracking for HAMT iterators (GH-155517) (#155697)

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      miss-islington

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      nascheme

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21. Commits on Aug 8, 2026

    • [3.15] gh-151524: Make it clearer that `_PyInstrumentation_DISABLE` is immortal in the code (GH-151525) (#155350)

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      miss-islington

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      lpyu001

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22. Commits on Aug 4, 2026

    • [3.15] gh-154902: Type-check the SET_ADD operand (#155071)

      deadlovelll

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