[sergo] Sergo Report: reverify-plus-unenforced-linter-zero-violation-audit - 2026-05-27

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Executive Summary

Run 20 audited the gap between Sergo's 15 registered custom analyzers and the 2 currently enforced in CI (errstringmatch, panicinlibrarycode). Two analyzers — osexitinlibrary and rawloginlib — have zero production violations in pkg/, making them the safest possible CI hardening candidates (no refactor, no risk, pure discipline lock-in). Sergo also re-filed #aw_sg19a1 (manualmutexunlock) with an updated count of 13 → 16 prod sites, after the previous tracker auto-expired under the 7-day rule.

Success Score: 9/10 — Two distinct, high-quality findings with concrete actionable fixes. One zero-cost CI hardening upgrade and one re-filed open finding with refreshed evidence.

Serena Tools Update

Tools Snapshot

• Total Tools Available: 23 (stable since Run 4; 17 consecutive runs of identical surface)
• New Tools Since Last Run: None
• Removed Tools: None
• Modified Tools: None

Tools Used Today

• activate_project (6.5s cold) — confirmed project activation
• Grep + Read (preferred for simple symbol lookups; faster than find_symbol for broad patterns)

Strategy Selection

Cached Reuse Component (50%)

Previous Strategy Adapted: reverify-plus-manual-mutex-unlock-audit (R19, 2026-05-26, score 9)

• Why Reused: R19 filed #aw_sg19a1 but the auto-expire (7d) closed it; needed refresh with updated counts.
• Modifications: Re-checked the 13 R19 sites for line drift, found 2 NEW sites added since R19 (agentdrain/coordinator.go:115, parser/virtual_fs_wasm.go:37 — both trivial RLock-read-RUnlock).
• Continuity: Re-verified #aw_sg14a1 (10 sites unchanged), #aw_sgbo1 (2 different-shape sites still defensible).

New Exploration Component (50%)

Novel Approach: unenforced-linter-zero-violation-audit — systematically audit each registered-but-unenforced analyzer to find ones with zero prod violations (= safe to enforce immediately).

• Tools Employed: Grep over pkg/!_test.go filtered by analyzer-specific symbol patterns (os.Exit(, log.Fatal|log.Print|log.Println|log.Panic, fmt.Fprintln([^,]+,\s*fmt.Sprintf()
• Hypothesis: At least one of the 13 unenforced analyzers would have zero prod violations and be a free enforcement upgrade.
• Target: All 15 registered analyzers at cmd/linters/main.go.

Combined Strategy Rationale

The two components complement each other: reverify provides continuity (don't lose tracked-but-expired findings), zero-violation audit provides discovery (find cheap wins). Together they cover the state-management (what to keep tracking) and discovery (what to add) axes of an audit cycle.

Analysis Execution

Codebase Context

• Custom analyzers registered: 15 (cmd/linters/main.go:38-52)
• CI-enforced analyzers: 2 (-errstringmatch -panicinlibrarycode per cgo.yml:1041)
• Unenforced: 13
• Focus area: cmd/linters/, .github/workflows/cgo.yml, all pkg/ excluding _test.go and testdata/

Findings Summary

• Total Issues Found: 6
• Critical: 0
• High: 2 (zero-violation enforcement opportunity for 2 analyzers)
• Medium: 1 (manualmutexunlock — 16 prod sites; refiled)
• Low: 3 (line-drift reverifications of sg14a1, sg17a1, sgbo1)

Detailed Findings

High Priority

1. osexitinlibrary analyzer registered but unenforced — ZERO prod violations

• Linter: pkg/linters/osexitinlibrary/osexitinlibrary.go (24 lines, skips cmd/ and *_test.go automatically)
• Registered: cmd/linters/main.go:46
• Audit query: rg 'os\.Exit\(' pkg/ -g '!*_test.go' → ZERO hits (1 hit in pkg/linters/osexitinlibrary/testdata/ is expected analyzer-test fixture)
• Status: Ready to enforce with zero refactor

2. rawloginlib analyzer registered but unenforced — ZERO prod violations

• Linter: pkg/linters/rawloginlib/rawloginlib.go (9 functions checked: Print/Printf/Println/Fatal/Fatalf/Fatalln/Panic/Panicf/Panicln)
• Registered: cmd/linters/main.go:49
• Audit query: rg 'log\.(Fatal|Print|Println|Panic)' pkg/ -g '!*_test.go' → ZERO hits in actual code (only testdata/ and doc.go/README.md example snippets)
• Status: Ready to enforce with zero refactor

Medium Priority

3. manualmutexunlock analyzer registered but unenforced — 16 prod sites (refiled #aw_sg19a1)

Updated counts vs R19's 13 sites:

Full 16-site breakdown

Risk	File	Lock line	Unlock line(s)	Reason
High	agentdrain/miner.go	118	122	function call between
High	agentdrain/miner.go	137	139	RLock — store map
High	agentdrain/miner.go	148	150	RLock — store map
High	console/spinner.go	130	132, 138	program.Quit + wg.Wait
High	console/spinner.go	143	145	program operation
High	console/spinner.go	159	162, 168	conditional Unlock
High	console/spinner.go	175	178, 183	conditional Unlock
High	cli/compile_watch.go	189	209	time.AfterFunc body
High	cli/compile_watch.go	197	204	callback
High	cli/docker_images.go	104	107, 111	conditional Unlock
High	cli/docker_images.go	149	151	pullImage call
Low	agentdrain/coordinator.go	115	117	NEW R20 — trivial RLock+map+RUnlock
Low	console/spinner.go	195	197	trivial
Low	parser/virtual_fs.go	102	104	trivial
Low	parser/virtual_fs_wasm.go	37	39	NEW R20 — wasm build-tagged trivial

New sites added since R19: agentdrain/coordinator.go:115, parser/virtual_fs_wasm.go:37 — both trivial (defensible-by-exemption category).

Low Priority — Reverification

Line-drift checks

• #aw_sg14a1 (10 silent syscall discard sites): unchanged. Still 4 os.Setenv (engine_secrets.go:329/377/430, add_interactive_orchestrator.go:73) + 6 os.Chdir (deploy_command.go:131, update_command.go:224, trial_repository.go:217/236/545, trial_helpers.go:332). Tracker Silent error discards on os.Setenv / os.Chdir in pkg/cli (10 prod sites) #33459 remains open.
• #aw_sg17a1 (panicinlibrarycode enforcement): stays enforced via cgo.yml:1041 LINTER_FLAGS=-panicinlibrarycode.
• #aw_sgbo1 (filepath.Join workflow shape variants): 2 sites unchanged and intentional — cli/git.go:303 (trailing slash for git add shape), cli/fix_command.go:410 (Separator-suffixed prefix-match).

Improvement Tasks Generated

Task 1: Enforce osexitinlibrary + rawloginlib in CI (zero-cost hardening)

Issue Type: CI linter enforcement

Location: .github/workflows/cgo.yml:1041

Before:

run: make golint-custom LINTER_FLAGS="-errstringmatch -panicinlibrarycode -test=false"

After:

run: make golint-custom LINTER_FLAGS="-errstringmatch -panicinlibrarycode -osexitinlibrary -rawloginlib -test=false"

Validation: make golint-custom LINTER_FLAGS="-osexitinlibrary -rawloginlib -test=false" should pass with zero diagnostics.

Estimated Effort: Trivial (1 line change).

Severity: High (pure discipline lock-in with zero refactor risk).

Task 2: Address manualmutexunlock (refiled #aw_sg19a1) — 16 prod sites

Issue Type: Mutex panic-safety refactor + linter exemption refinement

Recommendation: 3-pronged fix —

1. Refactor 11 high-risk sites to deferred wrappers (closure)
2. Refine linter to exempt trivial Lock-read-Unlock (5 low-risk sites)
3. Append -manualmutexunlock to LINTER_FLAGS

Estimated Effort: Medium (multi-file refactor, ~11 wrapper conversions, similar in scale to R19's panic linter refinement).

Success Metrics

This Run

• Findings Generated: 6
• Tasks Created: 2
• Files Analyzed: 15+ linter implementations + cgo.yml + pkg/ audit (osexit, rawlog, mutex, syscall scopes)
• Issues Created via safeoutputs: 2 (#aw_sg20a1, #aw_sg19a1 re-file)
• Success Score: 9/10

Reasoning for Score

Positives:

• Two distinct, complementary findings.
• One is free CI hardening — no refactor, just selector flag append.
• Other is a refresh with new evidence (2 new sites discovered).

Deductions:

• Did not deeply audit the other 11 unenforced analyzers (fileclosenotdeferred, regexpcompileinfunction, etc.) — left for R21/R22.

Historical Context

Strategy Performance

• R12-R20 streak: avg 8.78/10 over last 9 runs.
• R19's manualmutexunlock finding now refreshed in R20 (cycle: file → expire → re-file).
• Pattern: zero-violation enforcement upgrades have been historically delivered after broader audits (errstringmatch R13 → enforced; panicinlibrarycode R17 → enforced R19).

Cumulative Statistics

• Total Runs: 20
• Total Findings: 175
• Total Tasks Generated: 43
• Average Success Score: 8.60/10
• Most Successful Strategy Family: reverify-plus-* (9 consecutive scores ≥8)

Recommendations

Immediate Actions

1. HIGH: Merge #aw_sg20a1 fix (one-line LINTER_FLAGS append) — zero risk, locks in 2 disciplines.
2. MEDIUM: Plan refactor for #aw_sg19a1 (manualmutexunlock) — 11 high-risk sites, similar effort to R19's panic linter refinement.
3. MEDIUM: Continue working #aw_sg14a1 (silent syscall discards, tracked by Silent error discards on os.Setenv / os.Chdir in pkg/cli (10 prod sites) #33459 open since 2026-05-20).

Long-term Improvements

• Continue the registered-then-enforced pipeline: 4 linters now in steady state (errstringmatch, panicinlibrarycode, ready: osexitinlibrary, rawloginlib). Once sg14a1 fixed, ossetenvlibrary joins. Once sg19a1 fixed, manualmutexunlock joins.
• Audit remaining 9 unenforced analyzers in R21–R23 (fileclosenotdeferred, regexpcompileinfunction, ssljson, fprintlnsprintf, ctxbackground, errormessage, excessivefuncparams, largefunc, uncheckedtypeassertion).

Next Run Preview

Suggested Focus Areas

• Audit fprintlnsprintf (already confirmed zero hits in R20 — likely enforce candidate)
• Audit fileclosenotdeferred for prod violations
• Reverify sg14a1, sg19a1, sg20a1

Strategy Evolution

The zero-violation-audit sub-strategy is highly productive (high-impact, zero-risk findings). Consider running a broad sweep across all 13 unenforced analyzers in R21 to identify all zero-violation candidates at once.

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Generated by Sergo — The Serena Go Expert

References:

• §26491943719 (this Run 20)
• cmd/linters/main.go (15 registered analyzers)
• cgo.yml:1041 (CI enforcement selector)

Generated by 🤖 Sergo - Serena Go Expert · opus47 16.9M · ◷

• expires on May 28, 2026, 5:16 AM UTC

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This discussion was automatically closed because it expired on 2026-05-28T05:16:52.782Z.

Closed by Workflow