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gh-145559: Add PyUnstable_DumpTraceback() and PyUnstable_DumpTracebackThreads() by alexmalyshev · Pull Request #148145 · python/cpython · GitHub

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gh-145559: Add PyUnstable_DumpTraceback() and PyUnstable_DumpTracebackThreads() - #148145

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vstinner merged 12 commits into
python:mainfrom
alexmalyshev:traceback
May 6, 2026
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gh-145559: Add PyUnstable_DumpTraceback() and PyUnstable_DumpTracebackThreads()#148145
vstinner merged 12 commits into
python:mainfrom
alexmalyshev:traceback

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alexmalyshev commented Apr 5, 2026 •
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These functions stopped being exported in #107215. However, they are the only way to print a Python stacktrace safely from a signal handler, making them very useful for extensions. Re-export them.

Regenerated from #145560 due to a bad merge.

📚 Documentation preview 📚: https://cpython-previews--148145.org.readthedocs.build/

Add PyUnstable_DumpTraceback() and PyUnstable_DumpTracebackThreads()
fc1d6ad 
Public versions of _Py_DumpTraceback() and _Py_DumpTracebackThreads().
bedevere-app Bot mentioned this pull request Apr 5, 2026
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alexmalyshev marked this pull request as ready for review April 6, 2026 20:09

vstinner commented Apr 30, 2026

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@alexmalyshev: There are now merge conflicts, can you try to solve them? Moreover, a new max_threads parameter has been added. Can you update your PR to add it?

vstinner mentioned this pull request Apr 30, 2026
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read-the-docs-community Bot commented May 1, 2026 •
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Documentation build overview

📚 cpython-previews | 🛠️ Build #32564237 | 📁 Comparing cbfc410 against main (c0e0640)

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36 files changed · ± 36 modified

± Modified

vstinner reviewed May 4, 2026
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Comment thread Doc/c-api/exceptions.rst Outdated
Comment thread Python/traceback.c Outdated
vstinner mentioned this pull request May 4, 2026
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vstinner approved these changes May 6, 2026
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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

LGTM if my suggestions are applied :-)

Comment thread Doc/c-api/exceptions.rst Outdated
Comment thread Modules/faulthandler.c
Comment thread Doc/whatsnew/3.15.rst Outdated
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cbfc410 
Co-authored-by: Victor Stinner <vstinner@python.org>
vstinner enabled auto-merge (squash) May 6, 2026 14:32
vstinner merged commit 646853d into python:main May 6, 2026
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alexmalyshev deleted the traceback branch May 6, 2026 15:28

alexmalyshev commented May 6, 2026

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Thanks for all the help @vstinner, I really appreciate it!

vstinner commented May 6, 2026

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You're welcome. Thanks for your contribution.

vstinner commented May 6, 2026

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There is no tests on the newly added C APIs. These functions are tested indirectly by test_faulthandler.

hoodmane mentioned this pull request Jul 19, 2026
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