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https://issues.apache.org/jira/browse/HDDS-16438?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Siyao Meng updated HDDS-16438:
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Attachment: HDDS-16438.001.patch
> FSO lifecycle scan can skip an unscanned directory's expired keys after a mid
> scan crash
> ----------------------------------------------------------------------------------------
>
> Key: HDDS-16438
> URL: https://issues.apache.org/jira/browse/HDDS-16438
> Project: Apache Ozone
> Issue Type: Bug
> Reporter: Siyao Meng
> Priority: Major
> Attachments: HDDS-16438.001.patch
>
>
> h3. Finding
> Cache-first unordered enumeration breaks canSkipDir's descending-order
> premise, so on crash/resume an unscanned FSO directory is skipped and its
> expired keys are not collected; the demonstrated external effect (expired
> data left uncollected past its lifecycle policy) is currently masked by the
> next-generation fresh rescan, and absent that rescan the skip would persist
> and recur under repeated faults. Reachable through the FSO lifecycle scan on
> any bucket with a concurrent mkdir in the partial cache during a mid-scan
> crash. MASKED: classified by the consequence the defect would expose if the
> rescan mask were absent.
> h3. Classification
> * Verdict: MASKED
> * Severity: High
> * Source: Specula TLA+ model checking and confirmation debate, finding MC-1
> h3. Reproduce
> {noformat}
> Ozone commit: 9fbf9ee0cb1bd2f5f5d437b6719ebbe5309351fb
> Specula: v1.1.0 (commit c6aa3dfa)
> Target: om-key-lifecycle
> Guidance:
> campaigns/ozone-9fbf9ee/targets/006-om-key-lifecycle/.prompt-extra.md
> {noformat}
> {code:none}
> specula run --agent=claude-code --effort=high --keep-original
> --max-parallel=2 \
> --enable-reviews --confirm-debate --tlc-memory-limit=28G
> --tlc-worker-limit=8 \
> "om-key-lifecycle|apache/ozone|Java|Use the target-specific
> .prompt-extra.md"
> {code}
> Discovered under HDDS-16429 (Specula TLA+ verification effort). The TLA+
> specification, counterexample, and confirmation debate live in the Specula
> run artifacts.
> Generated with Specula (Claude Opus 4.8).
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