typelevel / typelevel/cats-effect
Flakiness in `IOSpec`
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Description
https://github.com/typelevel/cats-effect/actions/runs/7732197317/job/21083847462#step:24:3685
...
[error] x not lose cedeing threads from the bypass when blocker transitioning
[error] List(3714008, 3714008, 3714008) == 'List(3714008, 3714008, 3714008)' (IOPlatformSpecification.scala:459)
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[info] Total for specification IOSpec
[info] Finished in 17 seconds, 346 ms
[info] 346 examples, 13123 expectations, 1 failure, 0 error
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
Start by reproducing the IOSpec failure from the linked CI run and inspect IOPlatformSpecification.scala:459. Trace the cedeing-thread behavior during blocker transitions, then verify that IOSpec completes without the reported flaky failure across repeated runs.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- scala
- Domain
- testing
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 25/100