fix(errors): don't claim the backend crashed with no evidence that it did - #1810
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… did Two Apple Silicon reporters were told "it most likely crashed or was killed mid-request" while generating. Neither bug report carried a crash marker, because none had been recorded — the app had no evidence for the one thing it asserted, and the advice that follows that sentence is Retry and Clean & Retry, which rebuilds the whole Python environment to fix a backend that had not died. Two causes, both fixed here. The desktop shell learns the backend died from a ~2 s poll: it has to notice the child exit before it can write the marker. `apiFetch` asked for that marker exactly once, at the instant the transport gave up, so it raced the poll and lost either way round — a backend that really died was reported with the vague sentence instead of its exit code and crash notice, and one that never died was reported as dead anyway. `streamDropError` already waits that poll out (#1119); the request path never did. The loop is now a shared `awaitBackendCrashMarker`, used by both, with a shorter budget here because the transport cascade has already cost the user a few seconds. And the copy itself overshot what it could know. By construction it is reached only once a crash has been looked for and not found, so it no longer names one: it says the backend stopped answering with no crash recorded, and that a heavy job holding the engine is the likelier story — which on a memory-pressured Mac mid-generation it is. Updated in all 21 locales, since a translation still asserting a crash would be the same bug in another language. The #1337 test that required the crash wording is updated with it: #1337 established that the backend had answered seconds earlier, not what silenced it, and requiring the stronger claim is what pinned this in place. Fixes #1802. Fixes #1805. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01HR6J9zKQop9TGGVUwjypnF
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| Filename | Overview |
|---|---|
| frontend/src/api/client.ts | Uses cancellation-aware delays and waits briefly for crash evidence before constructing an unreachable-backend error. |
| frontend/src/utils/backendCrash.ts | Centralizes crash-marker polling while preserving immediate fallback outside Tauri and when forensics are unavailable. |
| frontend/src/utils/abortableDelay.ts | Adds an abort-aware timer that removes listeners on completion or cancellation. |
| frontend/src/utils/backendContact.ts | Rewords the no-marker fallback without asserting an unsupported crash cause. |
| frontend/src/test/client.crashRace.test.ts | Covers delayed crash markers, marker-free fallback copy, and cancellation across diagnostic waits. |
| CHANGELOG.md | Adds the PR entry under Fixed, leaving the previous unresolved request to place it in Highlights. |
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Included review availability: Your plan provides up to 10 included reviews per hour; 4 remain after this review. 📝 WalkthroughWalkthroughThe desktop client now polls for delayed backend crash markers before reporting transport failure. It honors cancellation during retries and diagnostics. It reports unresponsive backends without recorded crash evidence as potentially stuck on heavy work. Several locales also received clone-interface translations. ChangesBackend crash diagnostics
Clone-interface localization
Estimated code review effort: 3 (Moderate) | ~25 minutes Merge Risk: ⚪ Minimal · up to Backend connection failures now wait briefly for recorded crash evidence and otherwise describe the backend as potentially still running but unresponsive, avoiding unsupported crash claims. No current merge-blocking risk is identified. Suggested reviewers: 🚥 Pre-merge checks | ✅ 7 | ❌ 2❌ Failed checks (2 warnings)
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In `@frontend/src/api/client.ts`:
- Around line 442-445: Make the diagnostic polling started by apiFetch
abort-aware: reuse the shared abort-aware delay for retry, reconciliation, and
crash-marker polling, and pass signal through to awaitBackendCrashMarker. Add a
regression test that aborts during polling and verifies the abort is honored
instead of surfacing a crash or unreachable error.
In `@frontend/src/i18n/locales/id.json`:
- Line 9: Update the contact_recent Indonesian translation value so it uses
“Backend terakhir merespons {{ago}} yang lalu, kemudian berhenti merespons...”
wording, while preserving the {{ago}} placeholder and the rest of the message’s
meaning.
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CHANGELOG.mdfrontend/src/api/client.tsfrontend/src/i18n/locales/ar.jsonfrontend/src/i18n/locales/de.jsonfrontend/src/i18n/locales/en.jsonfrontend/src/i18n/locales/es.jsonfrontend/src/i18n/locales/fr.jsonfrontend/src/i18n/locales/hi.jsonfrontend/src/i18n/locales/id.jsonfrontend/src/i18n/locales/it.jsonfrontend/src/i18n/locales/ja.jsonfrontend/src/i18n/locales/ko.jsonfrontend/src/i18n/locales/nl.jsonfrontend/src/i18n/locales/pl.jsonfrontend/src/i18n/locales/pt.jsonfrontend/src/i18n/locales/ru.jsonfrontend/src/i18n/locales/sv.jsonfrontend/src/i18n/locales/th.jsonfrontend/src/i18n/locales/tr.jsonfrontend/src/i18n/locales/uk.jsonfrontend/src/i18n/locales/vi.jsonfrontend/src/i18n/locales/zh-CN.jsonfrontend/src/i18n/locales/zh-TW.jsonfrontend/src/test/backendContact.test.tsfrontend/src/test/client.crashRace.test.tsfrontend/src/utils/backendContact.tsfrontend/src/utils/backendCrash.ts
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| - Backend connection errors report crashes only when recorded evidence exists, and diagnostic waits honor cancellation (#1810) |
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Fixed, but the repository requires Unreleased entries to appear under the short Highlights list. Move this single-line bullet to Highlights; this requirement must be satisfied before merging.
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Fixes #1802. Fixes #1805.
The reports
Two reporters, independently, on Apple Silicon — an M2 with 24 GB and an M3 with 16 GB, both MPS, both on the
omnivoiceengine, both mid-generation:Neither report carries a Last backend crash section. That section is automatic (#941) whenever a marker exists, and
should_record_backend_crashrecords one for essentially every death. So the app asserted the single thing it had no evidence for — and the advice that follows sends the user to Clean & Retry, which rebuilds the entire Python environment, to fix a backend that had not died.Two causes
1. The marker lookup races the shell's death poll — and loses both ways round.
The desktop shell learns the backend died from a ~2 s poll: it must notice the child exit before it can write the marker.
apiFetchasked for that marker exactly once, at the instant the transport gave up:So a backend that really died was usually reported with the vague sentence instead of its exit code and a "View crash details" click, and one that never died was reported as dead anyway.
streamDropErroralready waits this out (#1119) — the request path never got the same treatment.The loop is now a shared
awaitBackendCrashMarker, used by both paths.streamDropErrorkeeps its 8 s budget;apiFetchuses 4 s, because its retry cascade has already cost the user ~3 s and two poll intervals is enough to stop losing the race.2. The copy overshot what it could know.
By construction,
unreachableBackendMessageis reached only after a crash has been looked for and not found. So it no longer names one:Which on a memory-pressured Mac mid-generation is the likelier story, and it matches what
apiFetchalready says on the neighbouring branch when the shell confirms the backend isready(#1113). Updated in all 21 locales — a translation still asserting a crash is the same bug in another language.One existing test changed
backendContact.test.tsrequired/crashed or was killed/i. #1337 established that the backend had answered seconds earlier — not what silenced it — and requiring the stronger claim is what pinned this in place. The test now asserts the last-contact story and that neither over-claim ("still starting up", "crashed or was killed") comes back.Tests
Both halves fail before / pass after, verified locally.
client.crashRace.test.ts— a marker that lands two poll intervals late is reported as a real crash with its exit code, not as the generic sentence; and the fallback copy names no cause.waitMs: 0the first fails; with the old wording the second fails.Full frontend suite on this branch: 2597 passed. Locale parity, CJK and changelog-style guards pass.
Not fixed here
Why those backends went quiet in the first place — a heavy MPS generation on a 16 GB machine — is a separate question, and #1804/#1808 are the compute-budget side of it. This PR is about not lying to the user about what happened.
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apiFetchandstreamDropErrornow wait for crash-marker evidence before reporting a backend crash and honor cancellation during diagnostic waits. Without evidence, the UI states that the backend may still be running but unresponsive during heavy work, with updated translations and tests. Please review the polling timing and fallback behavior when crash-marker retrieval is unavailable.