Need to keep traceback alive in WITH_EXCEPT_START
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- Dominant language
- Python
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Description
Bug report
Bug description:
Currently in WITH_EXCEPT_START the interpreter loop gets the traceback from the exception object and then immediately decref's it before calling the __exit__ function. But the __exit__ function may not incref the traceback (if it's not an interpretedPython function) and could cause the traceback to be replaced on the exception, leading it holding onto a freed traceback.
CPython versions tested on:
CPython main branch, 3.12
Operating systems tested on:
Linux
Linked PRs
- gh-130562
- gh-130626
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Review linked PRs gh-130562 and gh-130626 first, then locate the WITH_EXCEPT_START interpreter-loop implementation in CPython. Verify the traceback remains valid while exit runs and add or update coverage for the reported replacement and lifetime scenario.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- python
- Domain
- compilers
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 25/100