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gh-140936: Fix JIT assertion crash at finalization if some generator is alive by efimov-mikhail · Pull Request #140969 · python/cpython · GitHub

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gh-140936: Fix JIT assertion crash at finalization if some generator is alive - #140969

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Fidget-Spinner merged 8 commits into
python:mainfrom
efimov-mikhail:issue-140936-jit-crash-at-finalization
Nov 12, 2025
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gh-140936: Fix JIT assertion crash at finalization if some generator is alive#140969
Fidget-Spinner merged 8 commits into
python:mainfrom
efimov-mikhail:issue-140936-jit-crash-at-finalization

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efimov-mikhail commented Nov 3, 2025 •
edited by bedevere-app Bot
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I've removed setting interp->jit to false at finalization.
Because in rare case it may be a problem when some optimized code is used after finalize_modules.

New test needs subprocess since we have assertion crash only at the finalization stage.
On release builds there was no real problem, and test passed with this fix and without it.

bedevere-app Bot mentioned this pull request Nov 3, 2025
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Fidget-Spinner commented Nov 3, 2025

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Hmm I think this isn't the problem.

The problem might be that JUMP_BACKWARD is specialized to JUMP_BACKWARD_JIT.

Following that, finalization happens, turning the JIT off. However, some of the JUMP_BACKWARD still remains as JUMP_BACKWARD_JIT.

This causes optimizer to be triggered on JUMP_BACKWARD_JIT.

The real fix should be to check if interp->jit is false in _PyOptimizer_Optimize and immediately return if not.

efimov-mikhail commented Nov 3, 2025

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CC @brandtbucher as author of #129194

efimov-mikhail commented Nov 3, 2025

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The real fix should be to check if interp->jit is false in _PyOptimizer_Optimize and immediately return if not.

Ok, I've provided this fix.

Fidget-Spinner commented Nov 3, 2025

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@efimov-mikhail thanks. Just checking: does it pass the test on your system? I didn't test it but I think it should.

efimov-mikhail commented Nov 3, 2025

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On my system new test passes with this fix and fails without it on debug build.
And all others tests also pass.

Fidget-Spinner reviewed Nov 3, 2025
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Comment thread Lib/test/test_capi/test_opt.py Outdated
ZeroIntensity reviewed Nov 4, 2025
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Comment thread Lib/test/test_capi/test_opt.py Outdated
sergey-miryanov approved these changes Nov 4, 2025
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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

LGTM

Fidget-Spinner reviewed Nov 6, 2025
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Comment thread Lib/test/test_capi/test_opt.py Outdated

efimov-mikhail commented Nov 12, 2025

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Friendly ping, @Fidget-Spinner, @ZeroIntensity .
Can we merge this or there's something else that I have to address?

Fidget-Spinner reviewed Nov 12, 2025
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Comment thread Python/optimizer.c
Fidget-Spinner merged commit 35ed3e4 into python:main Nov 12, 2025
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miss-islington-app Bot commented Nov 12, 2025

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Thanks @efimov-mikhail for the PR, and @Fidget-Spinner for merging it 🌮🎉.. I'm working now to backport this PR to: 3.14.
🐍🍒⛏🤖 I'm not a witch! I'm not a witch!

miss-islington-app Bot commented Nov 12, 2025

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Sorry, @efimov-mikhail and @Fidget-Spinner, I could not cleanly backport this to 3.14 due to a conflict.
Please backport using cherry_picker on command line.

cherry_picker 35ed3e4cedc8aef3936da81a6b64e90374532b13 3.14

efimov-mikhail commented Nov 12, 2025

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Thanks for the merge, @Fidget-Spinner. I'll provide manual backport for 3.14.

efimov-mikhail added a commit to efimov-mikhail/cpython that referenced this pull request Nov 13, 2025
pythongh-140936: Fix JIT assertion crash at finalization if some gene…
e996564 
…rator is alive (pythonGH-140969)

bedevere-app Bot commented Nov 13, 2025

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GH-141494 is a backport of this pull request to the 3.14 branch.

bedevere-app Bot removed the needs backport to 3.14 bugs and security fixes label Nov 13, 2025
Fidget-Spinner pushed a commit that referenced this pull request Nov 13, 2025
[3.14] gh-140936: Fix JIT assertion crash at finalization if some gen…
48b7d75 
…erator is alive (GH-140969) (GH-141494)

gh-140936: Fix JIT assertion crash at finalization if some generator is alive (GH-140969)
CuriousLearner added a commit to CuriousLearner/cpython that referenced this pull request Nov 13, 2025
Merge branch 'main' into fix-issue21914
b9f473c 
* main: (463 commits)
  pythongh-140601: Add ResourceWarning to iterparse when not closed (pythonGH-140603)
  pythongh-137969: Fix double evaluation of `ForwardRef`s which rely on globals (python#140974)
  pythongh-139109: A new tracing JIT compiler frontend for CPython (pythonGH-140310)
  pythongh-141004: Document `PyErr_RangedSyntaxLocationObject` (python#141521)
  pythongh-140873: Add support of non-descriptor callables in functools.singledispatchmethod() (pythonGH-140884)
  pythongh-139653: Add PyUnstable_ThreadState_SetStackProtection() (python#139668)
  pythongh-141004: Document `PyCode_Optimize` (pythonGH-141378)
  pythongh-141004: Document C APIs for dictionary keys, values, and items (pythonGH-141009)
  pythongh-137959: Fix `TIER1_TO_TIER2` macro name in JIT InternalDocs (pythonGH-141496)
  pythongh-139871: Add `bytearray.take_bytes([n])` to efficiently extract `bytes` (pythonGH-140128)
  pythongh-140601: Refactor ElementTree.iterparse() tests (pythonGH-141499)
  pythongh-135801: Add the module parameter to compile() etc (pythonGH-139652)
  pythongh-140260: fix data race in `_struct` module initialization with subinterpreters (python#140909)
  pythongh-137109: refactor warning about threads when forking (python#141438)
  pythongh-141004: Document `PyRun_InteractiveOneObject` (pythonGH-141405)
  pythongh-124111: Fix TCL 9 thread detection (pythonGH-128103)
  pythongh-141442: Add escaping to iOS testbed arguments (python#141443)
  pythongh-140936: Fix JIT assertion crash at finalization if some generator is alive (pythonGH-140969)
  Add details about JIT build infrastructure and updating dependencies to `Tools/jit` (python#141167)
  pythongh-141412: Use reliable target URL for urllib example (pythonGH-141428)
  ...
CuriousLearner added a commit to CuriousLearner/cpython that referenced this pull request Nov 14, 2025
Merge branch 'main' of github.com:python/cpython into fix-Issue18387
c46ecc5 
* 'main' of github.com:python/cpython: (464 commits)
  pythongh-140601: Add ResourceWarning to iterparse when not closed (pythonGH-140603)
  pythongh-137969: Fix double evaluation of `ForwardRef`s which rely on globals (python#140974)
  pythongh-139109: A new tracing JIT compiler frontend for CPython (pythonGH-140310)
  pythongh-141004: Document `PyErr_RangedSyntaxLocationObject` (python#141521)
  pythongh-140873: Add support of non-descriptor callables in functools.singledispatchmethod() (pythonGH-140884)
  pythongh-139653: Add PyUnstable_ThreadState_SetStackProtection() (python#139668)
  pythongh-141004: Document `PyCode_Optimize` (pythonGH-141378)
  pythongh-141004: Document C APIs for dictionary keys, values, and items (pythonGH-141009)
  pythongh-137959: Fix `TIER1_TO_TIER2` macro name in JIT InternalDocs (pythonGH-141496)
  pythongh-139871: Add `bytearray.take_bytes([n])` to efficiently extract `bytes` (pythonGH-140128)
  pythongh-140601: Refactor ElementTree.iterparse() tests (pythonGH-141499)
  pythongh-135801: Add the module parameter to compile() etc (pythonGH-139652)
  pythongh-140260: fix data race in `_struct` module initialization with subinterpreters (python#140909)
  pythongh-137109: refactor warning about threads when forking (python#141438)
  pythongh-141004: Document `PyRun_InteractiveOneObject` (pythonGH-141405)
  pythongh-124111: Fix TCL 9 thread detection (pythonGH-128103)
  pythongh-141442: Add escaping to iOS testbed arguments (python#141443)
  pythongh-140936: Fix JIT assertion crash at finalization if some generator is alive (pythonGH-140969)
  Add details about JIT build infrastructure and updating dependencies to `Tools/jit` (python#141167)
  pythongh-141412: Use reliable target URL for urllib example (pythonGH-141428)
  ...
CuriousLearner added a commit to CuriousLearner/cpython that referenced this pull request Nov 14, 2025
Merge branch 'main' of github.com:python/cpython into fix-issue24255
c240289 
* 'main' of github.com:python/cpython: (464 commits)
  pythongh-140601: Add ResourceWarning to iterparse when not closed (pythonGH-140603)
  pythongh-137969: Fix double evaluation of `ForwardRef`s which rely on globals (python#140974)
  pythongh-139109: A new tracing JIT compiler frontend for CPython (pythonGH-140310)
  pythongh-141004: Document `PyErr_RangedSyntaxLocationObject` (python#141521)
  pythongh-140873: Add support of non-descriptor callables in functools.singledispatchmethod() (pythonGH-140884)
  pythongh-139653: Add PyUnstable_ThreadState_SetStackProtection() (python#139668)
  pythongh-141004: Document `PyCode_Optimize` (pythonGH-141378)
  pythongh-141004: Document C APIs for dictionary keys, values, and items (pythonGH-141009)
  pythongh-137959: Fix `TIER1_TO_TIER2` macro name in JIT InternalDocs (pythonGH-141496)
  pythongh-139871: Add `bytearray.take_bytes([n])` to efficiently extract `bytes` (pythonGH-140128)
  pythongh-140601: Refactor ElementTree.iterparse() tests (pythonGH-141499)
  pythongh-135801: Add the module parameter to compile() etc (pythonGH-139652)
  pythongh-140260: fix data race in `_struct` module initialization with subinterpreters (python#140909)
  pythongh-137109: refactor warning about threads when forking (python#141438)
  pythongh-141004: Document `PyRun_InteractiveOneObject` (pythonGH-141405)
  pythongh-124111: Fix TCL 9 thread detection (pythonGH-128103)
  pythongh-141442: Add escaping to iOS testbed arguments (python#141443)
  pythongh-140936: Fix JIT assertion crash at finalization if some generator is alive (pythonGH-140969)
  Add details about JIT build infrastructure and updating dependencies to `Tools/jit` (python#141167)
  pythongh-141412: Use reliable target URL for urllib example (pythonGH-141428)
  ...
StanFromIreland pushed a commit to StanFromIreland/cpython that referenced this pull request Dec 6, 2025
pythongh-140936: Fix JIT assertion crash at finalization if some gene…
3ff68f7 
…rator is alive (pythonGH-140969)
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Fidget-Spinner Fidget-Spinner approved these changes
sergey-miryanov sergey-miryanov approved these changes
ericsnowcurrently Awaiting requested review from ericsnowcurrently
markshannon Awaiting requested review from markshannon markshannon is a code owner
ZeroIntensity Awaiting requested review from ZeroIntensity

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