fix(utils): preserve message of thrown non-Error objects in crash diagnostics

[developjik]

What

errorForDiagnostic now preserves the .message/.name of thrown non-Error objects in crash diagnostics instead of reducing them to [object Object], and is hardened so it can never throw on the uncaughtException path.

Why

errorForDiagnostic reduced any thrown non-Error to new Error(String(reason)), which stringifies a plain object to [object Object]. A structured startup-failure shape such as { phase, reason, message } therefore surfaced in the crash log and on stderr as an opaque [object Object], hiding the real reason behind a generic fatal crash.

Change

• packages/utils/src/postmortem.ts: errorForDiagnostic surfaces .message (and .name) when present on a thrown plain object, otherwise falls back to a best-effort JSON snapshot. Error instances and primitives are unchanged; arrays keep their existing String() format ("1,2,3").
• Never-throw hardening: this runs on the uncaughtException/unhandledRejection path, so every property read and serialization is guarded — a throwing getter (or Proxy get-trap) on .message/.name, a circular structure, or a non-serializable value cannot re-enter the crash path. A throwing .name getter does not clobber a valid .message. The terminal String(reason) fallback is also guarded (an array element whose toString throws reaches it).

Testing

• bun test packages/utils/test/postmortem-crash-log.test.ts → 24 pass, including: throwing .message getter never throws; throwing .name getter preserves .message; arrays keep "1,2,3"; array element with throwing toString never throws; circular object.
• tsc --noEmit -p packages/utils/tsconfig.json → clean.
• biome check on changed files → clean.

Focused checks per CONTRIBUTING ("focused tests first"); the full bun check is left for CI.

GJC verdict

Independent architect re-review (second pass): the original HIGH (a throwing getter could re-throw on the never-throw crash path) and the array behavior change are both resolved — APPROVE / ship-with-nits.

gajae.pr-review-verdict.v1 merge-approved sha256:29acfe7433e5cd0d5e7ed9131187da6f93dea1971da5da5b4c3ac4f8da980cab reviewer:architect evidence:bun-test postmortem-crash-log.test.ts(24 pass) tsc utils(clean) biome(clean)

---

• Target branch is dev
• bun check passes (focused checks pass locally; full check pending CI)
• Tested locally
• CHANGELOG updated
• Verdict above matches the exact PR head

[chatgpt-codex-connector]

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[Yeachan-Heo]

Exact-head GPT-heavy adversarial batch review for 3e193322645fd5e18e8211408f5b5aff7b2a4d7b.

Recorded PR base: f9dffed426a433bf4948bdeb8fb2fe76f25ef5ca. Current dev: 732856b3ccb3fade6e9fbc17908a4fbca5a7682f. The current-base merge is clean, but the source change has blocking fatal-path and privacy defects.

Terminal verdict: REQUEST_CHANGES

Blocking findings

1. The claimed never-throw normalizer still throws on hostile/revoked Proxies (packages/utils/src/postmortem.ts:194,204,379). reason instanceof Error and Array.isArray(reason) are outside any guard. On this exact head under Bun 1.3.14, a Proxy whose getPrototypeOf trap throws changed the original Uncaught Exception into a secondary Unhandled Rejection: getPrototypeOf boom; a revoked Proxy behaved the same way. The original fatal handler rejects before persistence/stderr/cleanup and loses the original diagnostic. The new direct recordFatalCrash tests do not prove this path because that writer has an outer catch.

2. The JSON fallback newly leaks arbitrary object fields and performs unbounded work before the crash-record cap (postmortem.ts:212,242-248,331-334,384,387-390). Exact-head reproduction with { code: "E_AUTH", token: "opaque_session_credential_0123456789" } persisted the token verbatim in gjc-crash.log and printed it to stderr; the current scrubber does not cover a bare token field. Large/deep objects and hostile toJSON/getters are serialized synchronously before the 64 KiB bound, so the fatal path can allocate heavily, stall, or re-enter.

3. Copied .name bypasses durable redaction (postmortem.ts:220-221,333). err.name is interpolated raw while only message/stack are scrubbed. An exact-head probe with a PAT-shaped name persisted that credential in the crash-log header. Raw name/message values can also inject newlines or terminal control sequences into the record and stderr. Redaction/sanitization must cover every sink, or the fallback must avoid arbitrary object snapshots.

Verification and automation

• Local exact-head focused test: bun test packages/utils/test/postmortem-crash-log.test.ts — 24 pass, 0 fail.
• Additional exact-head process probes reproduced the Proxy containment failure and both redaction leaks above.
• GitHub has 0 check runs/status contexts for this head. Dev CI and Public site sync both ended action_required with zero jobs.
• Automated feedback consists only of the Codex usage-limit comment; there are no prior submitted reviews, inline comments, or review threads.

Required regression coverage: spawned fatal-handler tests for hostile/revoked Proxies, opaque-field/name redaction across crash log + stderr/logger, and bounded behavior for the new serialization path.

Signed terminal receipt: gajae.pr-review-verdict.v1 request-changes sha256:3e193322645fd5e18e8211408f5b5aff7b2a4d7b reviewer:Yeachan-Heo evidence:gpt-heavy-adversarial-batch-2026-08-05

[Yeachan-Heo]

Exact-head adversarial read-only review of 3e193322645fd5e18e8211408f5b5aff7b2a4d7b (PR #3823, base dev @ f9dffed42, 1 commit, 3 files) against current dev (f359a9d7e). Merge is clean (mergeable: true), focused tests pass, and the intended feature works on the spawned fatal-handler path — but the change introduces two credential-leak regressions in the durable crash log and fails to deliver its own claimed never-throw guarantee.

Terminal verdict: REQUEST_CHANGES

Blocker 1 — JSON fallback persists arbitrary, unredacted object fields into the durable crash log

errorForDiagnostic snapshots any non-array object via JSON.stringify when .message is absent (postmortem.ts:212). recordFatalCrash scrubs only err.message/err.stack (postmortem.ts:331-334), and redactCrashSecrets has no rule for a bare token/secret field or arbitrary opaque values. Exact-head probe:

recordFatalCrash("Uncaught Exception", { code: "E_AUTH", token: "opaque_session_credential_0123456789" }, { path: "leak.log" });

persists Error: {"code":"E_AUTH","token":"opaque_session_credential_0123456789"} verbatim into the rotation-immune crash log. Before this PR the same throw recorded [object Object]; the leak is introduced by this change, in a module whose stated purpose is scrubbing credentials before indefinite persistence.

Blocker 2 — copied .name bypasses durable redaction

err.name is interpolated raw into the record header while only message/stack are scrubbed (postmortem.ts:333). Probe with { name: "ghp_abcdef0123456789abcdef0123", message: "x" } writes the raw PAT in the header line, while the identical value in message position is redacted («redacted-github-token»). Names can also carry newlines/control characters into a line-based record, letting a thrown object forge record boundaries.

Blocker 3 — the claimed never-throw guarantee does not hold for hostile/revoked Proxies

The change's own comment says a "Proxy get-trap ... cannot re-enter the crash path", but reason instanceof Error (postmortem.ts:194) and the new Array.isArray(reason) (postmortem.ts:204) are unguarded and both invoke the proxy's getPrototypeOf trap. Spawned exact-head probes on the uncaughtException path:

• throw new Proxy({}, { getPrototypeOf() { throw new Error("getPrototypeOf boom") } }) — the crash log records only [Unhandled Rejection] Error: getPrototypeOf boom (created at postmortem.ts:194); the original exception is lost and the label is degraded.
• a revoked proxy — [Unhandled Rejection] TypeError: Proxy has already been revoked ... at the same site.

The new direct recordFatalCrash tests cannot prove this path because that writer has an outer catch.

Non-blocking observations

• The object branch catches all non-array objects, not just plain ones: Date/RegExp/Map/Set/Promise now serialize to a quoted string or {}, regressing fidelity vs the previous String() output (/re/, [object Map]). Consider gating on plain objects and letting non-plain objects fall through to the guarded String() path.
• JSON.stringify runs unbounded before the 64 KiB record cap, so a huge/deep thrown object does arbitrarily heavy synchronous work on the fatal path.

Verification

• bun test packages/utils/test/postmortem-crash-log.test.ts — 24 pass, 0 fail (exact head).
• Positive control on the spawned fatal-handler path: throw { phase, reason, message } — message preserved on stderr and in the crash log, exit 1.
• Exact-head probes reproduced Blocker 1/2 leaks and Blocker 3 proxy containment failure.
• CI on head: 0 check runs, 0 status contexts (mergeable_state: unstable); no green CI evidence for this commit.

Required before merge: route every persisted field (message, name, and the JSON snapshot) through redactCrashSecrets, avoid snapshotting opaque fields, and make the entire normalization (including instanceof/Array.isArray) never-throw with spawned fatal-handler regression tests.

Signed terminal receipt: gajae.pr-review-verdict.v1 request-changes sha256:3e193322645fd5e18e8211408f5b5aff7b2a4d7b reviewer:Yeachan-Heo evidence:owner-adversarial-batch-2026-08-05

[developjik]

Rebased onto the current dev (8c35ccf) and addressed every blocking finding from the two REQUEST_CHANGES reviews. bun test packages/utils/test/postmortem-crash-log.test.ts → 28 pass, 0 fail on the new head (focused tests + spawned fatal-handler Proxy fixtures); tsc -p packages/utils/tsconfig.json is clean for postmortem.ts.

• JSON-fallback credential leak — dropped the JSON.stringify snapshot of plain objects entirely. Only a string .message is surfaced now; plain objects without one fall back to the existing safe String() rendering, so a bare token/secret field can no longer bypass the regex redactor. Added a regression test asserting opaque_session_credential_… is not persisted.
• Copied .name bypasses redaction — err.name is now routed through redactCrashSecrets in both sinks: the crash-log header (recordFatalCrash) and the stderr banner (formatFatalError). Added a test asserting a PAT-shaped name is redacted to «redacted-github-token».
• Never-throw on hostile/revoked Proxy — the entire errorForDiagnostic normalization is wrapped in a single outer guard, so instanceof / Object.getPrototypeOf trap throws can no longer mask the original fatal. Added spawned fatal-handler fixtures for both a Proxy whose getPrototypeOf trap throws and a revoked Proxy; each exits 1 and records [Uncaught Exception] with no secondary getPrototypeOf boom.
• Control-char / line-break injection — name and message are sanitized of terminal escape sequences and line/control characters at the Error source (so the Error.stack first line is clean too) and in both sinks, preventing record-boundary forgery. Added a test covering an ESC-sequence name and a newline-bearing message.
• Non-blocking fidelity regression also fixed: arrays and non-plain objects (Date/RegExp/Map/Set/…) keep the pre-change String() rendering instead of a JSON snapshot.

Re-requesting review.

[Yeachan-Heo]

Exact-head adversarial review for 8c35ccfa2ef6eeb08a2d3dedc3823c81b68e7f13 (PR #3823, base dev).

Terminal verdict: REQUEST_CHANGES

The code change is sound and closes all three prior blockers, but the changelog entry lands in a released section and the head carries no green CI evidence.

Blocking: changelog entry under released ## [0.12.12]

The ### Fixed note is inserted directly under ## [0.12.12] - 2026-08-05 (tag v0.12.12 exists), not under the empty ## [Unreleased] section above it. Per the repo changelog contract (AGENTS.md: "add entries under ## [Unreleased], never edit released sections"), this must move up to ## [Unreleased]. This is the same blocker previously raised on #3704's earlier iterations; the just-merged #3704 correctly placed its entry under ## [Unreleased].

Verified solid (no changes requested there)

• Never-throw on hostile/revoked Proxy — the entire errorForDiagnostic normalization is wrapped in a single outer guard, so instanceof / Object.getPrototypeOf trap throws cannot mask the original fatal. Spawned fatal-handler fixtures for both a throwing-getPrototypeOf Proxy and a revoked Proxy each exit 1 and record [Uncaught Exception] with no secondary getPrototypeOf boom.
• No credential leak — the JSON-snapshot fallback is removed entirely; only a string .message is surfaced, and plain objects without one fall back to the safe String() rendering, so opaque fields (e.g. a bare token) cannot bypass the redactor.
• .name redacted in both sinks — err.name is routed through redactCrashSecrets in the crash-log header (recordFatalCrash) and the stderr banner (formatFatalError); a PAT-shaped name becomes «redacted-github-token».
• Control-char / line-break injection — sanitizeCrashHeader strips terminal escapes and C0/DEL control bytes at the Error source and both sinks, preventing record-boundary forgery.

Verification (exact head)

• bun test packages/utils/test/postmortem-crash-log.test.ts — 28 pass, 106 assertions, 0 fail.
• Merge-tree vs current dev (b621997e): 0 conflicts.
• GitHub CI on this head is action_required (Dev CI and Public site sync both waiting for workflow approval, 0 jobs); no green exact-head CI evidence exists to date.

Required before merge: (1) move the changelog entry to ## [Unreleased]; (2) approve the pending Dev CI workflow and obtain green exact-head CI on a new head.

—
[repo owner's gaebal-gajae (clawdbot) 🦞]

[developjik]

Pushed 0887ff4. The single blocker from the latest review is fixed: the ### Fixed note moved from the released ## [0.12.12] up to the empty ## [Unreleased], and [0.12.12] now matches the released tag verbatim (diff against dev shows only the one [Unreleased] entry). The code side was already verified solid in the prior review.

The only outstanding item is exact-head CI: both Dev CI and Public site sync are still action_required (fork-approval gate, 0 jobs), so no green exact-head verdict exists yet — that needs workflow approval, which is a maintainer action on this fork.

[developjik]

Rebased again onto the latest dev (edd0c13) to clear a fresh changelog conflict from dev advancing past the prior head. The change is unchanged: the single ### Fixed note stays under ## [Unreleased] and [0.12.12] matches the released tag verbatim. bun test packages/utils/test/postmortem-crash-log.test.ts → 28 pass. Remaining blocker is exact-head CI (action_required, fork gate).

[yazzang-homelab]

CI가 안 도는 이유를 확인했다 — 네 잘못이 아니다.

이 PR의 워크플로 런은 action_required 상태로 멈춰 있다. 즉 실행된 적이 없고, 그래서 head에 체크가 0건이다. GitHub의 포크 PR 워크플로 승인 게이트이고, 저장소 소유자가 "Approve and run workflows"를 눌러야 시작된다.

gh api "repos/Yeachan-Heo/gajae-code/actions/runs?head_sha=<이 PR head>" \
  -q ".workflow_runs[]|[.name,.status,.conclusion]|@tsv"
# -> Dev CI  completed  action_required

푸시를 더 해도 달라지지 않는다. 승인 없이는 새 런도 같은 상태로 들어간다. 같은 사유로 막힌 PR이 6건이라 #3940 으로 정리해 올렸다.

리뷰는 CI와 무관하게 진행하고 있으니 코드 피드백은 그대로 받으면 된다. 다만 이 저장소는 머지에 exact-head CI 증거를 요구하므로, 승인이 떨어지기 전까지는 머지가 불가능하다는 점만 알아두면 된다.

[Yeachan-Heo]

Closing during the emergency maintenance freeze. This PR is not in the retained critical or maintainer-owned set. Do not open a replacement PR unless a maintainer explicitly directs it.

—
[repo owner's gaebal-gajae (clawdbot) 🦞]