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620321a9cc feat(diagnostics): backend crashes become self-documenting — exit code + stderr tail surfaced and attached to bug reports (#969)
* feat(diagnostics): backend crashes become self-documenting — exit code + stderr tail surfaced and attached to bug reports

When the backend PROCESS died (native CUDA abort, OOM kill, DLL crash) the
user saw only "Can't reach the local OmniVoice backend" and the evidence
died with the process — every #941-class report needed a logs-please
round-trip nobody answers. The v0.3.9 guard fixed HANGS; this fixes the
class of invisible DEATHS:

- Rust (crash.rs): every unexpected child exit — detected by the startup
  health poll and the post-Ready supervisor — writes a rotating (last 3)
  JSON crash marker next to the backend logs: ts, exit code/signal,
  backend version, uptime, ~40-line stderr tail. Intentional shutdowns
  never forensicate: app-quit raises the quitting flag first (now also on
  macOS Cmd+Q via ExitRequested), and retry/clean-retry kills set a
  BACKEND_KILL_INTENDED flag cleared when the fresh child is tracked.
- Tauri commands get_last_backend_crash / acknowledge_backend_crash;
  ack is a persisted watermark, never a delete — bug reports still get
  the evidence after the user viewed it.
- Crash-loop escalation: the supervisor budget goes 5-in-60s → 3-in-10min
  so slow crash loops stop respawning and land on the Failed screen with
  the last exit code + stderr tail.
- Frontend: apiFetch's transport-failure path swaps the vague message for
  "the backend crashed (exit code X) N s ago…" when an unacknowledged
  marker exists, and BackendCrashNotice (banner + details dialog,
  i18n'd, ack-on-view) surfaces it even with no request in flight.
- Bug-report prefill gains a "Last backend crash" section (exit code +
  home-path-scrubbed stderr tail via the existing scrubText), so the next
  report arrives WITH the evidence.

Tests: cargo --lib 57 pass (marker rotation write-4-keep-3, ack
semantics, store IO, ExitStatus decomposition, 3-in-10min policy);
vitest 909 pass incl. crash-notice branch, client crash-message branch,
bug-report enrichment; legacy node:test 41 pass.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

* docs(changelog): add backend crash forensics under [Unreleased] (#969)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

---------

Co-authored-by: mergetest <test@local>
Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
2026-07-05 21:36:47 +05:30

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