Formal models and scripts: monitor-presearcher

Tools: TLA+/TLC

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

• Monitor.register with the same query id twice in one call keeps both versions in the query index, so the query matches a mix of both versions, and after a reopen a persistent Monitor runs the older version while getQuery returns the newer one (finding LFV-332; repro · finding page)

Files

• register-batch-duplicate-id-keeps-stale-version/model/QueryIndexConc.tla (used for LFV-332)

How to run

• TLA+ with TLC: java -cp tla2tools.jar tlc2.TLC -config <Model>.cfg <Model>.tla (a counterexample trace is the finding when the model encodes the current code).

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