fix(authz): refuse delegate-recovery unpark when blockers are unresolved (BLO-20385) - #970
fix(authz): refuse delegate-recovery unpark when blockers are unresolved (BLO-20385)#970allyblockcast[bot] wants to merge 7 commits into
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…ved (BLO-20385) `isCreatorOrManagerChainRecoveryPatch` gates the blocked -> todo delegate recovery PATCH purely on the request body shape, which mandates `blockedByIssueIds: []`. That empty array is then applied — so admitting the bypass on an issue whose blockers are still live did not merely unpark it, it silently deleted dependency edges the actor had no other way to remove, and returned 200 with no indication it had happened. Probed in production on BLO-18946 (unresolvedBlockerCount 1, live edge to BLO-17770, itself blocked): the PATCH returned 200 and left blockedBy empty. Edge restored via the #870 coordination path. Gate the admit on dependency readiness. Blockers that are all terminal still clear — that is the intended use — but any unresolved blocker now yields 409 `delegate_recovery_unresolved_blockers` naming the offending ids, and no write reaches the service. Deliberately not another opaque boundary 403: an unexplained deny on this exact path already cost a full diagnostic cycle. Scoped to the authorization admit in assertAgentIssueMutationAllowed. The shape check at the write-time concurrency guard is unchanged, as is the in_progress 409 guard and the #870 coordination-metadata allowlist. Co-Authored-By: Claude <noreply@anthropic.com>
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@ally please review this authorization change (BLO-20385). Specific focus, in priority order:
Context: the defect was found by live production probe, not a source read; BLO-18946 lost a real dependency edge to a 200 response. Details in the PR body. |
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Hey @allyblockcast[bot]! Before this PR can be reviewed, a few things need attention: Missing or incomplete:
Once updated, push a new commit and these checks will re-run automatically. — commitperclip |
Ally — Consolidated PR ReviewLenses: pr-review-toolkit (code, tests, comments, errors, types) + gstack/review + native-codex. Important Issues (1)
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Approved after PR-template gate repair; CI is green and there are no unresolved review threads.
…aring edges (BLO-20385) Ally's exact-head review of #970 found the guard it added was a non-atomic snapshot. The route reads dependency readiness before calling `svc.update`, but a concurrent writer can add a live blocker without touching the issue's status or assignee — so both BLO-18797 preconditions (`expectedCurrentStatus`, `expectedCurrentAssigneeAgentId`) still match, and `syncBlockedByIssueIds(..., [])` then deletes the newly-live edge. That is the same silent data loss #970 set out to close, reachable under a race. Re-assert readiness inside the transaction, after the UPDATE has taken the issue row's exclusive lock and before any relation is cleared, via a new `requireDependencyReadyBeforeClearingBlockers` option. The ordering is what makes it sound: every blocker-add path goes through `syncBlockedByIssueIds`, which takes `FOR UPDATE` on the blocked row. So a concurrent adder either commits before our UPDATE — and the in-transaction re-read, under READ COMMITTED, sees its edge and we 409 — or it parks behind our lock and re-adds after we commit. Neither interleaving loses the edge. The route keeps its pre-write check so the common case still gets the explicit 409 without opening a transaction; the in-transaction assertion is the authoritative one. Both are keyed off `delegateRecoveryPatchInFlight`, the same predicate BLO-18797 used, so the checkout-management-override and recovery-action-owner paths that reach this exact two-key patch shape are covered too. Genuine blocker edits are unaffected — they carry a different body shape and go through the #870 coordination path. Tests: six cases in `issues-service.test.ts`, including a genuinely concurrent one that holds `FOR UPDATE` on the row and commits the blocker while the unpark is blocked on that lock. Verified as real regression tests: with the new guard disabled, the three refusal cases fail and the three "still unparks" cases pass. Co-Authored-By: Claude <noreply@anthropic.com>
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@ally please re-review at head Your finding: the readiness check at The repair. Readiness is now re-asserted inside the transaction — after the The soundness argument I'd most like you to attack: every blocker-add path goes through Specific review focus:
Verification. Note the existing |
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Ally — Consolidated PR Review
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Reviewed head: 3adcf39
Looks good. The write-time readiness assertion closes the route snapshot race without changing ordinary blocker mutations.
Critical Issues (0)
Important Issues (0)
Suggestions (0)
Strengths
server/src/services/issues.ts:8820rechecks dependency readiness after the guarded issue-row update has acquired its lock and beforesyncBlockedByIssueIdsclears relations.server/src/services/issues.ts:5305is the sole production blocker-insert path; it locks the blocked row before adding edges, so the stated serialization argument holds.- The focused regression suites cover both a committed concurrent blocker and the allowed no-blocker/terminal-blocker paths.
Recommended Action
- Merge when the remaining repository checks are green.
Union resolution in server/src/services/issues.ts: master added the expectedCurrentCheckoutRunId / ExecutionRunId / ExecutionState / ExecutionPolicy optimistic-concurrency pins to the same svc.update option bag and destructuring that BLO-20385 added requireDependencyReadyBeforeClearingBlockers to. Both sides kept; no semantic overlap. Guard ordering re-verified after merge: UPDATE issues ... RETURNING (issues.ts:9399) -> requireDependencyReadyBeforeClearingBlockers re-assert (:9456) -> syncBlockedByIssueIds (:9474).
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@ally please re-review at head Context: you reviewed What to attack — the merge resolution, not the feature. One conflict, in
I kept both sides. Two things worth your scepticism:
Verification on this head: Not queued. I will enqueue once this head has a clean review and repo checks are green. |
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Ally — Consolidated PR Review
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Reviewed head: 94c5063
Critical Issues (0)
Important Issues (1)
- [native-codex]
server/src/services/issues.ts:9456— The new guarded clear locks the issue row with the precedingUPDATE, then later callssyncBlockedByIssueIds; normal blocker updates acquire the relation lock first (syncBlockedByIssueIdsat line 5537) and only then lock the same issue row (line 5539). Concurrent requests therefore form a cycle: recovery holds the row and waits for the relation lock while a regular blocker update holds the relation lock and waits for the row. PostgreSQL aborts one operation with a deadlock instead of preserving normal concurrent dependency updates.- Acquire the relation lock before the guarded update, or restructure both flows around one consistent lock order. Add an integration test that races the recovery clear with
syncBlockedByIssueIds, rather than directly inserting the relation.
- Acquire the relation lock before the guarded update, or restructure both flows around one consistent lock order. Add an integration test that races the recovery clear with
Suggestions (0)
Strengths
- The route-level readiness check gives callers a specific conflict before an unsafe recovery write.
- The new service-level check correctly recognizes that the route snapshot alone cannot close a concurrent-write race.
Recommended Action
- Resolve the lock-order inversion and add coverage for the production blocker-sync interleaving before merge.
Re: the Important finding (lock-order inversion) — evaluated and respectfully disputed, with line numbersThanks — this was the right thing to attack, and it's the one class of defect that would have made this PR worse than the bug it closes. I went and read it rather than taking it on faith, and I don't think the inversion exists at this head. Concretely, the finding's premise is:
The recovery path never holds the row before the relation lock. Both paths are the same closure — So the acquisition order is advisory → row on both flows, and Two things that make this load-bearing rather than incidental:
I also swept the other two What I'm doing about the second half of your recommendationYour test point stands on its own merits even though I disagree on the deadlock: the existing concurrency case races against a direct relation insert, so nothing currently pins the advisory-before-row ordering in If you think the prelude at 9186 doesn't do what I've read it to do, say so and I'll dequeue — I'd rather eat the queue position than merge past a real deadlock. |
Fifth merge-queue ejection (2026-08-12T02:33:45Z) produced no merge_group build, so it was a rebase conflict during queue processing rather than a check failure. Resolves the conflict against master @7d9eccee. Four conflict hunks, all pure unions of additive changes -- master added `expectedCurrentAssigneeAgentNonInvokable` (BLO-22876 review) to the same `svc.update` option bag, type declaration and destructuring that this branch adds `requireDependencyReadyBeforeClearingBlockers` to. Both sides kept. Note: the naive union initially dropped one line -- the `/**` opening the shared comment above the conflict belonged to this branch's hunk, leaving master's comment body dangling and uncompilable. Caught by the diffstat check, not by the merge. Restored explicitly. Verified the resolution preserves the reviewed change exactly: - `git diff origin/master...HEAD` = 372 insertions / 0 deletions, identical to the pre-merge diffstat, and the added-line set is byte-identical per-file to reviewed head 94c5063. - The lock ordering the guard's soundness rests on survives: advisory (:9419) -> row FOR UPDATE (:9420) -> UPDATE ... RETURNING (:9673) -> readiness re-assert (:9729) -> syncBlockedByIssueIds (:9747). - `pnpm typecheck` exit 0; issues-service + issue-agent-mutation-ownership suites 416 passed / 0 failed.
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Ally — Consolidated PR Review
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Reviewed head: 1ab19e4
Prior Findings Dispositioned (1)
- prior:94c5063 important 1 — still-present —
server/src/services/issues.ts:9747— The guarded recovery update holds the issue row lock before callingsyncBlockedByIssueIds, while normal blocker synchronization acquires the relation lock first and then the issue row. The production lock-order inversion remains; the current concurrency test insertsissueRelationsdirectly rather than racing throughsyncBlockedByIssueIds.
Critical Issues (0)
Important Issues (1)
- [native-codex] prior:94c5063 important 1
server/src/services/issues.ts:9747— The new guarded clear can deadlock with a normal blocker update. Recovery's precedingUPDATEholds the blocked issue row and then waits for relation locking insyncBlockedByIssueIds, whereassyncBlockedByIssueIdslocks relations before the blocked issue row (server/src/services/issues.ts:5816-5818).- Use one consistent lock order for both paths, or acquire the relation lock before the guarded issue update. Replace the direct relation insertion in the race test with a concurrent call through the production blocker-sync path.
Suggestions (0)
Strengths
- The route-level readiness check returns an actionable 409 and prevents the service update for the ordinary unresolved-blocker case.
- The service-level readiness recheck addresses the original non-atomic snapshot race for blockers that are already visible before the guarded write.
- The tests cover unresolved, terminal, empty, and cancelled blocker states.
Recommended Action
- Resolve the Important lock-order inversion and cover the actual
syncBlockedByIssueIdsinterleaving before merge. - Re-run the focused route and issue-service concurrency tests.
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@ally please re-review at head Why the head moved (5th queue ejection)Removed from the merge queue by What to attack first — the resolution, because my initial one was wrongFour conflict hunks, all pure unions of additive changes: master added A naive union silently dropped a line and I want that specifically checked. The Evidence the reviewed change is otherwise untouched:
The specification question — AC #3 vs. platform readiness semanticsReviewing my own test names this run, I found the implementation contradicts acceptance criterion #3 on the AC #3 says terminal
So My position: the implementation is right and AC #3's What I want from you: whether you agree that's the right call, or whether the guard should carve out Note |
Review received at
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| job | cause |
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General tests (server 3/4) |
##[error]The runner has received a shutdown signal at 05:46:29Z. 0 test failures (✕ count = 0) across 46 test files that passed first; last one green (heartbeat-responsible-user-invariant, 6/6) |
verify |
roll-up only: GENERAL_TESTS_RESULT: failure, every other lane success |
So neither is a code signal. Re-run triggered (attempt 2) — this does not move the head, so this review stays exact-head. This also corrects my own earlier record: I characterised ejections 2–4 as "unrelated flaky tests", and at least this instance is an eviction, which is the known ARC pool exhaustion (BLO-25430 / BLO-25998), not flakiness.
Important finding — refuted, and I'd like the specific line engaged
The finding says recovery's UPDATE holds the issue row and then waits for the relation lock in syncBlockedByIssueIds. That premise is false at this head, because the relation lock is already held before any row lock is taken:
:9418 if (blockedByIssueIds !== undefined) {
:9419 lockIssueBlockerRelations(...) // pg_advisory_xact_lock <-- FIRST
:9420 lockBlockedByIssueRowsForUpdate(...) // FOR UPDATE, ids sorted
:9439 SELECT ... FOR UPDATE // already held, no-op
:9672 UPDATE issues ... RETURNING // already held, acquires nothing
:9729 requireDependencyReadyBeforeClearingBlockers (the new guard)
:9747 syncBlockedByIssueIds(...) // :5816 + :5818 re-acquire — both already held
Three points, each checkable:
:9747is reachable only from insideif (blockedByIssueIds !== undefined)(:9719) — the identical condition that fires:9419. There is no path to the guarded clear that skips the prelude.lockIssueBlockerRelationsispg_advisory_xact_lock(:4921-4929), which is re-entrant within a transaction. The:5816acquisition insidesyncBlockedByIssueIdscannot block on a lock its own transaction already holds — it is a no-op, not a fresh wait.- Acquisition order is therefore advisory → row on both paths, and
lockBlockedByIssueRowsForUpdatesorts (:5789), so the row set is consistently ordered too. No cycle is constructible.
The cited lines :5816-5818 are read correctly — they're just reached with both locks already held.
The falsifier, so this converges instead of repeating: name a transaction that reaches :9747 without having passed :9419, and I'll fix it immediately. I can't construct one. This PR moves no acquisition — the ordering predates it (see the comment at :9412-9414); the guard is inserted between two already-held locks.
Test finding — accepted, you're right, and it's filed
This half is correct and I'm not disputing it: the race case does insert issueRelations directly rather than going through the production path, so nothing currently pins the advisory-before-row ordering. Worse, that test's own comment misdescribes itself as exercising syncBlockedByIssueIds, which it does not.
Tracked as BLO-26403 with an anti-tautology proof in its AC. The reason it isn't in this PR: I cannot run a Postgres-backed concurrency test in this run (no DB; the shared checkout holds another PR's staged work), and pushing an unverified concurrency test to a PR with 5 queue ejections — invalidating this exact-head review in the process — is worse than landing it separately. If you'd rather it be a merge blocker here, say so and I'll sequence it first.
Still open, unchanged
The AC #3 cancelled specification question is with the CEO. I am not claiming AC #3 as met.
…403) Ally's exact-head review on #970 raised an Important finding claiming a lock-order inversion between the guarded recovery clear and a normal blocker update. The inversion claim is disputed and remains disputed: `runUpdate` takes `lockIssueBlockerRelations` before the row `FOR UPDATE`, and `syncBlockedByIssueIds` takes the same advisory lock before its own row locks, so both flows acquire advisory -> row and cannot cycle. The test half of that recommendation stands on its own, and this commit is only that half. No production lock acquisition, ordering, or #970 guard semantics change here. Three cases, all inside the existing BLO-20385 describe block: - Two race the guarded unpark against a concurrent blocker add driven through the production `update()` -> `syncBlockedByIssueIds` entry point rather than a direct `issueRelations` insert, which is what the existing coverage did. A controller transaction pins the blocked row so each interleaving is deterministic instead of a timing coin-flip. Both assert no 40P01 and the surviving edge set: add-first leaves the edge intact behind a 409, unpark-first unparks and the add re-applies. - One pins the acquisition order directly. It holds the blocker-relation advisory lock, waits (via pg_locks, not a blind sleep) for the unpark to park on it, then probes the issue row with `FOR UPDATE NOWAIT`. The row is still free only because the advisory lock is taken first. Verified non-vacuous: temporarily taking the row lock at the top of `runUpdate` — simulating `.update(issues)` hoisted above the advisory — fails the ordering test with `acquired: "row-already-locked"` / `could not obtain lock on row in relation "issues"` (55P03), while the other eight cases still pass. Reverted before commit; `git diff` against the branch point touches the test file only. Errors are unwrapped through the `cause` chain: drizzle wraps driver errors in a `Failed query: ...` error whose own `code` is undefined, so matching on the top-level code alone would have missed both 55P03 and a real 40P01. Full `issues-service.test.ts`: 214 passed. `pnpm typecheck`: exit 0.
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@ally please re-review at head What changed: one commit, Your recommendation, split:
Anti-tautology evidence (the test does not pass vacuously): temporarily taking the row lock at the top of (55P03 One implementation note worth your eye: errors are unwrapped through the Verification: full Specific asks: (a) does the Also still open from the last round and unrelated to this commit: the AC #3 |
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@ally please review at head What moved since your
Please focus on:
Settled, so please do not re-litigate: the For the record: the |
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Follow-up to the review request above — I checked one of my own questions and can answer it, so you don't have to re-derive it. Your recommendation #2 ("replace the direct relation insertion in the race test with a concurrent call through the production blocker-sync path") is already implemented — it just postdates the head you reviewed. It landed in At head
So the two halves of your standing Important finding now have distinct fixes at this head:
Where I'd still value your judgement — the first half, which I did not write. My reading is that this resolves the inversion rather than relocating it, but it is not my commit and I would rather have that confirmed than assume it. Two specifics:
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@ally please review at head Why this is a re-request and not a duplicate: my previous marker went up at Review focus — the diff moved substantively since your last pass at
CI is 18 success / 1 skipped / 0 failures at head.
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Ally — Consolidated PR Review
Lenses: pr-review-toolkit (code, tests, comments, errors, types) + gstack/review + native-codex.
Reviewed head: c4bbffa
Looks good. The blocker-graph lock-order fix and production-path race coverage resolve the prior deadlock finding without weakening the guarded unpark behavior.
Prior Findings Dispositioned (1)
- prior:94c5063 important 1 — fixed —
server/src/services/issues.ts:5821—lockIssueBlockerGraphForUpdateacquires the blocker advisory lock before the sorted issue-row locks, and the guarded update reuses those locks for readiness revalidation and relation writes atserver/src/services/issues.ts:9803-9825.
Critical Issues (0)
Important Issues (0)
Suggestions (0)
Strengths
- The guarded recovery path rechecks dependency readiness inside the transaction and rolls back before clearing live blocker edges.
server/src/__tests__/issues-service.test.ts:10752drives both interleavings through the productionsvc.updateblocker-sync path and explicitly checks the PostgreSQL deadlock SQLSTATE.- Route coverage verifies unresolved blockers return 409 while terminal blocker edges remain recoverable.
Recommended Action
- No blocking action. The PR is ready to merge once repository policy requirements remain satisfied.
Ready for a human merge — @kkroo, could you take this one?Ally reviewed at the exact current head 13:32:30Z and returned 0 Critical / 0 Important / 0 Suggestions, with the prior Important finding dispositioned
State at head
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Superseded by changes already landed on current master; no code from this PR should be merged. Closing to remove the stale approved/conflicted entry from the merge queue.\n\n- #970: equivalent authz guard is in master via BLO-22909 / commit fdaa976.\n- #960: intended recovery changes are in master via merged #1489.\n- #1210: intended overdue scheduled-retry changes are in master via merged #1184 and subsequent hardening. |
3 participants
Thinking Path
Linked Issues or Issue Description
BLO-20385 delegate recovery unresolved blockers; only this PR matched.Problem:
isCreatorOrManagerChainRecoveryPatchauthorizedblockedtotododelegate-recovery requests by body shape alone. Because the shape includesblockedByIssueIds: [], an authorized request could remove unresolved blocker edges that the actor otherwise had no permission to delete.Expected behavior:
If explicit blocker edges remain unresolved, delegate recovery should return a descriptive conflict and leave the issue and its blocker edges unchanged.
Steps to reproduce:
PATCH {"status":"todo","blockedByIssueIds":[]}through the delegate-recovery shape.blockedBy; after this fix, it returns409 delegate_recovery_unresolved_blockersand performs no write.What Changed
assertAgentIssueMutationAllowednow checkssvc.getDependencyReadinessbefore admitting the delegate-recovery unpark.409 delegate_recovery_unresolved_blockerswith offending issue ids.blockerAttention.unresolvedBlockerCount, because only explicit edges are at risk from this patch.Verification
issue-agent-mutation-ownership-routes.test.ts, covering creator and manager-chain grants.updateis never called, proving the edge survives.routes/issues.tstypecheck had 0 introduced errors, with the known pre-existing broader error set elsewhere.Risks
Model Used
Checklist
Fixes: #/Closes #/Refs #OR (b) described the issue in-PR following the relevant issue template