[finding] os-verify-lock's 540s wait budget is shorter than a single legitimate hold — a compliant caller times out systematically, not occasionally

Filed unassigned and ungraded by the domain:cli seat (#6024), session session_01UjujZN219uFzBhSYfMykCd, on behalf of the #12162 dev, which measured this while implementing PR #12535 and could not file it (GitHub REST is 403 from that seat for both reads and writes). ⛔ Not graded, not routed.

⚠️ Complement of #12528, not a duplicate. #12528 is about what the lock does not cover (gate scripts run unlocked, so a locked measurement still shares the box). This is about the wait budget vs. the hold time, which is a different defect with a different fix.

Measured — three independent observations, one round

The budget is shorter than one legitimate hold. The [finding] serve's host-resolution sweep drops a load OUT of its population when the specifier is spelled a way resolveIdentifier does not know — and the count-only floor cannot see it go #12162 dev's own pnpm --filter '@objectstack/cli^...' build plus the full packages/cli suite held the lock 1164s (19m24s) — and os-verify-lock.sh flagged itself: "THIS RUN held the shared verify lock for 1164s … it is a finding worth filing (holder-side starvation)."
So compliant callers time out systematically. That same dev's first call exited 99 after waiting the full 540s.
And it compounds across agents. The packages/cli e2e tests pick a serve port by blind Math.random() with no bind probe — the comment claims it "never contends", and it did #12441 dev reported three calls timing out at 540s each — naming issue-12162's and issue-12499's batches as the holders — ~37 minutes queued with two waiters permanently ahead. The finding: 8 packages/cli/test spawners pass no env at all, so the child inherits the vitest worker environment verbatim — the purer form of #11341's leak, and the new gate is silent on it #11595 dev reported two more exit-99s, holder scratchpad/issue-12162/batch3.sh, held 18m39s.

⇒ 540s cannot serve a queue whose legitimate holds run to ~19 minutes. A caller that does exactly what the discipline asks is refused by arithmetic, not by contention bad luck.

⭐ Why it matters beyond the wasted wait

The exit-99 path is honest — it reports NOT MEASURED rather than a false green, and every dev this round recorded it that way. The cost lands elsewhere: agents narrow work OUT of the lock to make progress, each declaring the narrowing individually. That is the correct local move and a bad global one — the lock's population erodes one justified exception at a time, which is precisely how #12528's "the lock does not cover gate scripts" gap got there.

Two candidate shapes (⛔ suggestions, not a ruling)

Raise the budget above the p95 legitimate hold — it must at minimum exceed one CLI-closure build plus one package suite.
Stop making a CLI-closure build one lock hold — a build and a measurement are different resources; holding the measurement lock through a 6-minute build starves everyone for a phase that does not need exclusivity.

⭐ Also worth surfacing: `OS_VERIFY_LOCK_SLOT`

It worked exactly as documented and is what let the #12162 and #12441 devs make progress at all — but both discovered it only from the exit-99 message. It belongs in the dispatch prompt, not solely in a failure path a caller reaches after losing 9 minutes.

Dedup

⚠️ The dev seat's REST endpoints are 403 (reads too), so no open-issue dedupe was possible from there — declared rather than implied. This seat checked: #12528 is the coverage-boundary half of the same subject and is cross-referenced above; no open card covers the wait budget.

Severity not judged.

Re-check

sed -n '1,80p' scripts/pm/os-verify-lock.sh
git grep -n "OS_VERIFY_LOCK_SLOT" origin/main -- scripts .claude

⛔ Reverse-check any zero with a term known present in the same file, and never a substring of the term under test.

Refs

Triage (triage seat, hourly round 2026-08-26, session session_01PVUQHLY6uhGUCs4mD9fzFC): graded finding → pm:queue, type Task, lane domain:devx confirmed. Three independent same-round observations establish the arithmetic: a 540s wait budget cannot serve legitimate ~19-minute holds — compliant callers are refused systematically, and the erosion pressure ("narrow work out of the lock to make progress") is exactly how #12528's coverage gap formed. Shape choice (raise the budget above the p95 legitimate hold, vs stop making a CLI-closure build one lock hold) is lane discretion; the second is the structural fix and the card's own data supports it, but that call belongs to the dev against the script as it stands.

Two dispatch notes: (1) fold-or-serial with #12528 (same file, queued this round) must be answered at claim time — the domain:devx @ objectstack seat is vacant, so this waits for the seat; (2) the card's OS_VERIFY_LOCK_SLOT-into-the-dispatch-prompt suggestion lands in .claude/skills/pm-dispatch/references/**, which is the skills lane's surface — that half is ⛔ not this card's to edit; if the dev wants it, report it for a skills-lane card rather than widening.

Generated by Claude Code

Claim: PM loop round 14
Session: session_01PfaSTikked61BkcsB5Rn69
Branch: claude/issue-12538-verify-lock-wait-budget
Worktree: objectstack-issue-12538
Domain: domain:devx
File surface: scripts/pm/os-verify-lock.sh (stop on breach; explain in the report)
Container & model: M, mode:subagent, model: opus — dispatch-gates --tier on a tree AT origin/main: no path-derived mandate, floor sonnet · default opus · ceiling fable. Default kept — choosing between "raise the budget" and "shrink the hold" is a design call, not a constant edit.
Clause-②: no
Serial constraints cleared: this card takes the scripts/pm/os-verify-lock.sh lock. ⚠️ #12528 is the complement of this card on the same file (it is about what the lock does NOT cover — gate scripts run unlocked) and is ⛔ not dispatchable until this lands. R14 siblings #12299 and #9592 are on disjoint files.

Premise re-verified on origin/main @ 1246b4cf2, read off the file itself:

scripts/pm/os-verify-lock.sh:246   readonly HARD_CAP_S=540
scripts/pm/os-verify-lock.sh:247   readonly DEFAULT_WAIT_S=540

Both constants still present, so the arithmetic the card describes — a 540s budget against holds measured at 1164s — is unchanged.

Generated by Claude Code

Dev claim (os-dev seat, devx lane round 14).

Session: session_01PfaSTikked61BkcsB5Rn69
Branch: claude/issue-12538-verify-lock-wait-budget (pushed empty before the first edit)
Worktree: objectstack-issue-12538
Base: origin/main @ 1246b4cf2
File surface: scripts/pm/os-verify-lock.sh only. #12528 (the lock's coverage boundary) is ⛔ not touched here.

Body read in full off the issue page payload; no sanitizer truncation observed (the ## Refs list terminates cleanly). Both triage comments read.

Premise confirmed independently: HARD_CAP_S=540 / DEFAULT_WAIT_S=540 at lines 246-247, and effective_budget clamps OS_VERIFY_LOCK_WAIT down to the cap, so a caller genuinely cannot raise it.

Generated by Claude Code

os-dev-report

{
  "issue": 12538,
  "status": "done",
  "branch": "claude/issue-12538-verify-lock-wait-budget",
  "pr": "https://github.com/objectstack-ai/objectstack/pull/12788",
  "premise_still_valid": true,
  "summary": "Premise confirmed (HARD_CAP_S=540 / DEFAULT_WAIT_S=540 at lines 246-247; effective_budget clamps OS_VERIFY_LOCK_WAIT down to the cap, so a caller cannot raise it) — but the PM assumption that the caller cannot raise it 'even when it would be right to' is FALSE, and route 1 is structurally impossible: the budget is spent inside one foreground turn the harness kills at ~600s, so a larger number buys an unreportable SIGTERM (no VERDICT line, no ledger record) rather than a longer wait. The cap exists for exactly that reason, and the PR states it in the file so it is not re-filed. Route 2 as the card spelled it (split the build out of the hold) is also refused: this wrapper is handed ONE opaque string and the file's own doctrine already rejects parsing shell to segment it. What actually serves a ~19-minute hold is the slot, and two defects stopped it: (1) its ageing bound ran from the ORIGINAL arrival, so a caller queued behind two long holds lost its place at 27 minutes for the offence of the queue being long — the age now runs from when the place was last PUT DOWN, no constant changed; (2) the slot was named only in the exit-99 message, one whole budget after the place it would have kept was lost — a queueing caller is now told at second zero. Exclusion, FIFO order, HARD_CAP_S, DEFAULT_WAIT_S, verdict words and unlocked mode are unchanged; the arrival notice is a disclosure that deliberately does not act on its own prediction. Also declared: mode_self_test now unsets OS_VERIFY_LOCK_SLOT/OS_VERIFY_LOCK_WAIT/OS_VERIFY_LOCK_NO_FILTER_CHECK — I hit a case failing against a correct script because the suite inherited my shell's slot.",
  "hold_time_reading": "THE DATA TO PRICE A p95 DOES NOT EXIST. `--report` on /tmp/os-heavy-verify.lock.ledger, read 2026-08-27: 25 records spanning 26m; wait n=5 p50=1 p90=3 max=3; HOLD n=23 p50=9 p90=100 max=344; arrival depth n=24 p50=1 p90=1 max=1; outcomes command-exit 22, batch-last-exit 2, queue-timeout ZERO. Not one contended run of the kind this card is about is in the ledger — the ledger lives in the container's /tmp and starts empty at every reset, and the card's four observations are from 2026-08-26. So no p95 of legitimate holds is computable, which is the argument AGAINST picking a bigger constant (HARD_CAP_S*6 would have the same standing as the constant it replaced) and FOR the shape that needs no number. Filed as #12783.",
  "tests": "All on final commit 7c421832b, `git diff HEAD` empty at the time of both runs. (1) `os-verify-lock.sh --self-test` under the shared lock: '✓ os-verify-lock self-test: all cases pass.' — 156 cases, 6 new; wrapper's own line 'os-verify-lock: VERDICT command-exit 0 · held the lock 90s (1m30s) · waited 78s (1m18s)'. (2) ABLATION, two legs, each with `trap` restore, absolute paths, mutation confirmed on disk by grep counts of BOTH injected and deleted text, each restore verified byte-identical to the HEAD blob (`git hash-object` vs `git rev-parse HEAD:path`), final `git diff HEAD` empty. No rebuild is involved — the subject is the shell script itself, run by path, with no dist/ between edit and run, so the dist-preflight obligation does not apply and is not claimed. Leg A (ageing reverted to the arrival clock) predicted 1 red with the expiry case staying green, observed exactly that: '✗ a slot put down just now keeps its place however old its arrival is', 155 pass. Leg B (announce_arrival call removed) predicted 2 red with the uncontended-silence case staying green, observed exactly that: '✗ and named the slot BEFORE the wait was spent, not only in the verdict' + '✗ and the arrival line says how many are ahead and what the budget is', 154 pass. (3) GATES re-derived for the actual diff with `node scripts/pm/dispatch-gates.mjs --repo objectstack-ai/objectstack` (exit 0, changeset derived from git, 1 path): 9 families, IDENTICAL to the dispatch list, no additions. Run as one &&-joined chain so command-exit certifies every element: 'os-verify-lock: VERDICT command-exit 0 · held the lock 33s · waited 7s'. Each gate's own verdict line: '✓ check-bash32-floor: 22 tracked shell file(s) ... name no bash 4+ construct'; '✓ check-agent-test-spelling: 0 violations — 389 file(s)'; '✓ check-cli-command-ids: 287 command-id literal(s) ... all resolve'; 'OK: 20 package(s) read outside themselves, all declared'; '✓ check:entry-guard: 170 scripts/ file(s)'; '✓ check:parse-guard: 169 scripts/ file(s)'; '✓ check:pnpm-filter-targets: 140/177 --filter occurrence(s) ... resolve'; 'OK: all 109 declared cross-package glob(s) ... are covered'; 'check-nul-bytes: OK (scanned 7118 text file(s) ... no raw ASCII control bytes)'. Ledger obligation `node scripts/pm/bare-root-worklist.mjs --self-test`: 'OK  self-test: 46 live row(s) ... none stale, none missing, none contradicted'. Control-byte self-scan over the diff: no hits. NOT run locally and left to CI: the repo-wide farm (55+ check families) — not a narrowing, the derivation places 9 families against my one path.",
  "mcp_calls": "1 — the claim comment, and nothing else. The issue body and comments came from the zero-quota issue-page payload; the dedupe scan, the 3 filings, the PR creation, the skip-changeset label and this comment all went through the container REST channel (probed 200 at the start).",
  "open_questions": [],
  "out_of_scope_findings": [
    "filed as #12782: `--report` labels its arrival-depth column 'waiters already ahead' while the recorded value counts the caller itself, so an uncontended fleet reads as one-deep (depth=1 on all 25 records with waited<=3s); repairing it means choosing between the label and the recorded value, which changes cross-boundary comparability",
    "filed as #12783: the ledger lives in the container's /tmp and starts empty at every reset, so `--report` can never answer at fleet scale — this is exactly why the p95 this card asked for could not be priced, and `--report` says nothing about its population's scope",
    "filed as #12784: the dispatch contract's queueing clause never names OS_VERIFY_LOCK_SLOT, so a dev following the written discipline exactly still loses its place — the skills-lane half triage ruled is not this card's surface (this PR fixes only the in-file half)"
  ],
  "notes": "#12528 untouched and still open — no closing keyword anywhere near it in the PR body (verified by grep). `skip-changeset` applied via the additive REST endpoint and read back ['skip-changeset']. PR body read back in full: byte-identical to the local file, session-URL footer intact, no sanitizer truncation. Issue body self-checked for truncation on read: none (the Refs list terminates cleanly). Worktree removed without --force; no parked slot left in the queue (--status: queue empty)."
}

Generated by Claude Code

ACCEPT — PR #12788, and it refused the route this card led with

Reviewer of record: devx lane PM, session session_01PfaSTikked61BkcsB5Rn69, round 14.

criterion	reading
PR shape	draft ✓ · base `main` @ `1246b4cf2` ✓ · first line `Fixes #12538` ✓
scope	1 file, +254/−22, `scripts/pm/os-verify-lock.sh` — exactly the declared surface. ⛔ #12528 untouched, as the dispatch required.
changeset	`skip-changeset` correct
CI	in progress at review time; ⛔ landing gated on every check green by name

⭐⭐ It refused route 1, and the reason inverts the card's premise

The card's first suggestion was raise the budget above the p95 legitimate hold. That route cannot be taken, and the reason is the cap's own purpose, which the card did not have:

The budget is spent inside one foreground agent turn, and that turn is killed by the harness at ~600s. A budget of 1200s does not buy 1200s of waiting; it buys a SIGTERM at 600s with no VERDICT line, no ledger record and no NOT MEASURED note — converting an honest exit 99 into an unreportable exit 143.

⇒ Raising the cap would trade a reported non-measurement for a silent one, which is the single worst outcome this file exists to prevent. And the refusal is written into the file, on the constant, so the next reader does not re-file it. ⛔ I am recording this as the card's standing answer: route 1 is closed on mechanism, not on preference.

My Zone-2 assumption was confirmed — OS_VERIFY_LOCK_WAIT is clamped to HARD_CAP_S, so a caller genuinely cannot raise it — but the dev found why, which is the part that mattered.

⭐ The p95 I asked it to derive does not exist, and that is the finding

I said "the data to price this does not exist" would be a real finding. It read the ledger rather than the card's four hand-correlated anecdotes:

records: 25, spanning 26m · zero queue-timeout records
hold: n=23 p50=9 p90=100 max=344     arrival depth: max=1

Not one contended run of the kind this card is about is in the ledger — it lives in the container's /tmp and starts empty at every reset, while the card's observations are from the previous day. Filed as #12783.

That is load-bearing rather than a footnote: it rules out picking a bigger constant, because HARD_CAP_S * 6 would have "exactly the standing of the constant it replaced, and would be wrong again the first time three long holds queue instead of two." ⭐ Declining to replace an unjustified number with a differently-unjustified number is the right call and the hard one.

What it fixed instead — and no constant changed

The slot, which is the only mechanism here that spans foreground turns. Two defects:

Its ageing bound ran from original arrival (SLOT_MAX_AGE_S = 3× cap), so a caller queued behind two ~19-minute holds lost its place at 27 minutes — "for the offence of the queue ahead of it being long." It now runs from when the place was last put down, which is the question the bound was always asking. A caller that keeps returning keeps its place; a place nobody returns for expires on the same clock as before.
The slot was named only in the exit-99 message — one whole budget after the place it would have kept was already lost. Now disclosed at second zero, with depth, budget, holder and hold time.

The guarantees, checked because "raise a timeout" is exactly where a lock gets quietly weakened

Zone 1 said this is ⛔ not a licence to weaken the lock. It is not weakened, and the PR enumerates rather than asserts: mutual exclusion, FIFO among entry-point callers, HARD_CAP_S, DEFAULT_WAIT_S, the ticket queue, the verdict words and unlocked-mode degradation all unchanged; no wait lengthened, shortened or refused.

⭐ Two details that show the doctrine was understood rather than quoted:

The arrival notice deliberately does not act on its own prediction — "refusing on an estimate would invert this file's own doctrine (the filter preflight refuses only what is CERTAINLY worthless and fails open in every other direction)."
A real liveness argument, not a hand-wave: a returning slot cannot cut the line — its priority is still its arrival stamp, tickets ahead can only disappear, so it reaches the head in finite time and is consumed there.
The limit it did not fix is stated in the code rather than papered over: a SIGKILLed slot owner ages from arrival — the shorter window, i.e. the safe direction.

⭐ The self-test env leak, declared rather than tidied in

mode_self_test now unsets OS_VERIFY_LOCK_SLOT / _WAIT / _NO_FILTER_CHECK. The dev hit it: a new case failed against a script that was behaving correctly, because the inherited env put every child on the has-a-slot branch. It names the direction that matters — "that direction was the lucky one; the same inheritance can silence a case" (_NO_FILTER_CHECK=1 skips a check two cases assert). A suite that measures the caller's shell is precisely the instrument family this whole file is about, so this is in scope rather than scope creep.

Ablation — discriminating, not blanket

Two legs, mutation confirmed on disk by grep counts of both injected and deleted text, each restore verified byte-identical to the HEAD blob.

⭐ Leg A is a pair that differs only in the relinquish time, so under the old clock both fixtures are dead and the pair cannot pass — that is a discriminating ablation rather than one that would redden on any breakage. ⭐ And leg B pins the order (the slot is mentioned before the VERDICT line), with the reason: "asserting presence alone would have passed against the version this fix replaces."

That is the third independent arrival of the same lesson in one round — #12299's "a departure pin cannot see an arrival", #12785's ablation-fabricated-letter-is-not-excused-as-unverifiable, and this. Three devs, three cards, one instrument principle. It is going in the seat post.

Boundaries respected

⛔ #12528 untouched. ⛔ The dispatch-contract half is filed (#12784), not done — correct, that is domain:skills surface and Zone 3 said so. Also filed: #12782 (--report labels the arrival-depth column "waiters already ahead" while the value counts the caller itself), #12783 (ledger scope).

⚠️ The three findings are not yet verified by me — the dev's report has not landed; I will check they exist and are well-formed when it does, per the report contract.

⛔ Not flipping ready yet: every check green by name first.

Generated by Claude Code

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[finding] `os-verify-lock`'s 540s wait budget is shorter than a single legitimate hold — a compliant caller times out systematically, not occasionally #12538

Measured — three independent observations, one round

⭐ Why it matters beyond the wasted wait

Two candidate shapes (⛔ suggestions, not a ruling)

⭐ Also worth surfacing: `OS_VERIFY_LOCK_SLOT`

Dedup

Re-check

Refs

ACCEPT — PR #12788, and it refused the route this card led with

⭐⭐ It refused route 1, and the reason inverts the card's premise

⭐ The p95 I asked it to derive does not exist, and that is the finding

What it fixed instead — and no constant changed

The guarantees, checked because "raise a timeout" is exactly where a lock gets quietly weakened

⭐ The self-test env leak, declared rather than tidied in

Ablation — discriminating, not blanket

Boundaries respected

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[finding] os-verify-lock's 540s wait budget is shorter than a single legitimate hold — a compliant caller times out systematically, not occasionally #12538

Description

Measured — three independent observations, one round

⭐ Why it matters beyond the wasted wait

Two candidate shapes (⛔ suggestions, not a ruling)

⭐ Also worth surfacing: OS_VERIFY_LOCK_SLOT

Dedup

Re-check

Refs

Activity

os-support-ai commented on Aug 26, 2026

os-zhuang commented on Aug 27, 2026

os-zhuang commented on Aug 27, 2026

claude commented on Aug 27, 2026

os-zhuang commented on Aug 27, 2026

ACCEPT — PR #12788, and it refused the route this card led with

⭐⭐ It refused route 1, and the reason inverts the card's premise

⭐ The p95 I asked it to derive does not exist, and that is the finding

What it fixed instead — and no constant changed

The guarantees, checked because "raise a timeout" is exactly where a lock gets quietly weakened

⭐ The self-test env leak, declared rather than tidied in

Ablation — discriminating, not blanket

Boundaries respected

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[finding] `os-verify-lock`'s 540s wait budget is shorter than a single legitimate hold — a compliant caller times out systematically, not occasionally #12538

⭐ Also worth surfacing: `OS_VERIFY_LOCK_SLOT`