leanprover / leanprover/lean4

lake hangs at "Computing build jobs" when a file in an upstream project is deleted

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#6,240 2 comments 0 reactions 0 assignees View on GitHub

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bug Lake P-high
Dominant language
Lean
Stars
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Forks
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Avg merge
1d 17h
Merged PRs (30d)
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Description

See commit 3ad5449927085b63f4304a13d534105004783bdd from Mathlib for a repro.

I've reported this a few times on zulip, but we better have a tracking issue.

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start by reproducing the hang using Mathlib commit 3ad5449927085b63f4304a13d534105004783bdd, focusing on lake while it computes build jobs after an upstream file deletion. Trace the build-job computation to determine why it does not finish; done means the reported reproduction no longer hangs.

Written by the indexing model from the issue text.

Assessment

Domain
build-system
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
35/100

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