gh-140936: Fix JIT assertion crash at finalization if some generator is alive #140969
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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 |
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CC @brandtbucher as author of #129194 |
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Ok, I've provided this fix. |
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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. |
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On my system new test passes with this fix and fails without it on debug build. |
Fidget-Spinner
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Nov 4, 2025
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Friendly ping, @Fidget-Spinner, @ZeroIntensity . |
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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. |
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Sorry, @efimov-mikhail and @Fidget-Spinner, I could not cleanly backport this to |
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Thanks for the merge, @Fidget-Spinner. I'll provide manual backport for 3.14. |
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GH-141494 is a backport of this pull request to the 3.14 branch. |
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* 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 cra A3E2 sh 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) ...
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* '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) ...
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* '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
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I've removed setting
interp->jittofalseat 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.