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Unittest: self-referencing explicit exception cause results in infinite loop #98458
Description
Bug report
If an exception is raised with a self-referencing __cause__ or __context__ then TestResult._clean_tracebacks() in result.py enters an infinite loop.
Minimal example 1:
try:
raise Exception()
except Exception as e:
raise e from eMinimal example 2:
try:
e = Exception()
raise e from e
except Exception as e:
raise eIdentified Cause
Self-references are not checked while unwinding the chained exception on line 216 of result.py
Your environment
- CPython versions tested on: 3.9, 3.10
- Operating system and architecture: macOS
Linked PRs
- gh-98458: unittest: bugfix for infinite loop while handling chained exceptions that contain cycles #98459
- [3.11] gh-98458: unittest: bugfix for infinite loop while handling chained exceptions that contain cycles (GH-98459) #99995
- [3.10] gh-98458: unittest: bugfix for infinite loop while handling chained exceptions that contain cycles (GH-98459) #99996
Activity
gh-98458: unittest: bugfix for infinite loop while handling chained e…
pythongh-98458: unittest: bugfix for infinite loop while handling cha…
pythongh-98458: unittest: bugfix for infinite loop while handling cha…
gpshead commentedon Dec 4, 2022
Thanks! A bit of an unusual issue but no doubt a pain to debug when something winds up with this happening.
The backport PRs should automerge after CI runs.
gh-98458: unittest: bugfix for infinite loop while handling chained e…
gh-98458: unittest: bugfix for infinite loop while handling chained e…