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GeezerVison is showing github.com — gh-145559: Add PyUnstable_DumpTraceback() and PyUnstable_DumpTracebackThreads() by alexmalyshev · Pull Request #148145 · python/cpython

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@alexmalyshev

@alexmalyshev 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.

  • Issue: Expose signal-safe way to print stacktraces #145559

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

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@alexmalyshev
Add PyUnstable_DumpTraceback() and PyUnstable_DumpTracebackThreads()
fc1d6ad 
Public versions of _Py_DumpTraceback() and _Py_DumpTracebackThreads().
@bedevere-app bedevere-app Bot mentioned this pull request Apr 5, 2026
Expose signal-safe way to print stacktraces #145559
Closed
alexmalyshev added 5 commits April 5, 2026 18:19
@alexmalyshev
Generate NEWS.d entry with blurb
d7c02c5
@alexmalyshev
Run make regen-configure
d7d4720
@alexmalyshev
Use backticks and roles properly in NEWS.d entry
7809d9c
@alexmalyshev
Fix missing colon
0e03292
@alexmalyshev
More sphinx-lint fixes
4bcd445
@alexmalyshev
alexmalyshev marked this pull request as ready for review April 6, 2026 20:09
@alexmalyshev
alexmalyshev requested review from AA-Turner, FFY00, ZeroIntensity, corona10, emmatyping, ericsnowcurrently and erlend-aasland as code owners April 6, 2026 20:09
@bedevere-app bedevere-app Bot added the awaiting review label Apr 6, 2026
@vstinner

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?
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@vstinner vstinner mentioned this pull request Apr 30, 2026
gh-148925: Add non-allocating PyUnstable_* APIs for call-stack iteration #148930
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alexmalyshev added 3 commits April 30, 2026 23:27
@alexmalyshev
Merge branch 'main' into traceback
aaa13b5
@alexmalyshev
Add back max_threads argument to decl after merge
5448a45
@alexmalyshev
Document max_threads argument
1ec0367
@read-the-docs-community

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)

  🔍 Preview build  

36 files changed · ± 36 modified

± Modified

  • glossary.html
  • c-api/exceptions.html
  • c-api/perfmaps.html
  • deprecations/index.html
  • deprecations/pending-removal-in-3.18.html
  • deprecations/pending-removal-in-3.19.html
  • deprecations/pending-removal-in-3.20.html
  • faq/programming.html
  • howto/descriptor.html
  • howto/perf_profiling.html
  • and 26 more...
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@encukou
Merge branch 'main' into traceback
116b58a
vstinner
vstinner reviewed May 4, 2026
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Comment thread Doc/c-api/exceptions.rst Resolved

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Comment thread Python/traceback.c Resolved

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@vstinner vstinner mentioned this pull request May 4, 2026
Add PyUnstable_DumpTraceback() and PyUnstable_DumpTracebackThreads() capi-workgroup/decisions#101
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4 of 5 tasks
@alexmalyshev
dump_error() and writing return values to fd
0e82438
vstinner
vstinner approved these changes May 6, 2026
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LGTM if my suggestions are applied :-)

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Comment thread Doc/c-api/exceptions.rst Resolved

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Comment thread Modules/faulthandler.c Resolved

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Comment thread Doc/whatsnew/3.15.rst Resolved

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@bedevere-app bedevere-app Bot added awaiting merge and removed awaiting review labels May 6, 2026
@vstinner
Apply suggestions from code review
cbfc410 
Co-authored-by: Victor Stinner <[email protected]>
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vstinner enabled auto-merge (squash) May 6, 2026 14:32
@vstinner
vstinner merged commit 646853d into python:main May 6, 2026
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@bedevere-app bedevere-app Bot removed the awaiting merge label May 6, 2026
@alexmalyshev
alexmalyshev deleted the traceback branch May 6, 2026 15:28
@alexmalyshev

alexmalyshev commented May 6, 2026

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

vstinner commented May 6, 2026

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You're welcome. Thanks for your contribution.
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@vstinner

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.
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@hoodmane hoodmane mentioned this pull request Jul 19, 2026
gh-145559: Make PyUnstable_DumpTraceback return void again #154131
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@vstinner vstinner vstinner approved these changes
@ericsnowcurrently ericsnowcurrently Awaiting requested review from ericsnowcurrently ericsnowcurrently is a code owner
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@alexmalyshev @vstinner @encukou
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