Formal models and scripts: iw-from-reader-commit-leaf-sorted-reader-pairs-wrong-segments

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

• An IndexWriter opened from a leaf-sorted reader's IndexCommit pairs each segment with the segment reader at the same leaf position, so deleteDocuments(term) deletes another segment's documents and the commit persists that silently (finding LFV-1062; repro · finding page)

Files

• iw-from-reader-commit-pairs-leaf-sorted-leaves-by-position/model/pairing_guard_z3.py (used for LFV-1062)

How to run

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

Snapshot of 2026-11-03. AI-assisted; not yet triaged by a human Lucene committer. Feedback: open an issue in lucene-ai-bug-hunt.