Siyao Meng created HDDS-16438:
---------------------------------
Summary: 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
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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