Formal models and scripts: indexrearranger-and-pkindexsplitter-failed-run-cleanup

Tools: Python

These are the working models and scripts this part of the hunt used. Some encode the code as it is (a counterexample is the expected result), others a fixed or correct variant; read the header comment of each file. Paths inside them were replaced by placeholders such as $LUCENE (a Lucene checkout) and $WORK.

Findings

• A failed IndexRearranger.execute() throws without waiting for its other tasks, and closes the input reader and the IndexWriter while those tasks still use them (finding LFV-1011; repro · finding page)

Files

• indexrearranger-failed-execute-closes-writer-and-input-under-running-tasks/model/analyze_mbt.py (used for LFV-1011)

How to run

• Python: python3 <file>.py; scripts that import z3 need the z3-solver package.

Snapshot of 2026-11-04. AI-assisted; not yet triaged by a human Lucene committer. Feedback: open an issue in lucene-ai-bug-hunt.