ci: preserve RemoteTmuxMirror crash diagnostics - #13180
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Included review availability: Your plan provides up to 10 included reviews per hour; 3 remain after this review. 📝 WalkthroughWalkthroughThe CI workflow now identifies the remote tmux mirror regression step. On failure, it collects isolated app-host crash reports and suite logs, then uploads non-empty diagnostics for seven days without replacing the original failure. ChangesRemote tmux diagnostics
Priority: ⬇️ Low Estimated code review effort: 2 (Simple) | ~10 minutes Change: Feature 🚥 Pre-merge checks | ✅ 25✅ Passed checks (25 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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In @.github/workflows/ci.yml:
- Around line 1168-1169: Update the crash-report collection step using
CMUX_APP_HOST_HOME to access the console-owned crash directory through a
validated privileged account that can traverse the isolated home, while
preserving write access to the runner-owned diagnostics/crash-reports
destination. Ensure the copy does not silently omit reports when runner and
console users differ.
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.github/workflows/ci.yml
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| source "$ci_script_dir/app-host-isolation.sh" | ||
| if cmux_validate_published_app_host_identity_values; then | ||
| crash_reports="$CMUX_RESOLVED_APP_HOST_HOME/.local/state/cmux/crash" | ||
| if [ -d "$crash_reports" ]; then |
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On runners where the app host belongs to a different console user, its isolated home is owned by that user and has mode 700. This unprivileged directory check therefore cannot traverse the home and returns false, skipping the whole copy block—including the passwordless sudo fallback intended for this case. As a result, the crash reports this change is meant to preserve are omitted from the artifact. Test the directory through the validated sudo path when ordinary access is denied instead of gating that fallback behind [ -d ].
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September 20, 2026 11:10
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4b18fc9 ci: track package test helper inputs (manaflow-ai#13188) b210493 Merge pull request manaflow-ai#13181 from manaflow-ai/ci-focused-app-host-tests ced163c Merge pull request manaflow-ai#13180 from manaflow-ai/ci/remote-tmux-crash-diagnostics 9faf726 Merge pull request manaflow-ai#13178 from manaflow-ai/ci-reject-incomplete-test-runs 14c3ca1 Merge pull request manaflow-ai#13166 from manaflow-ai/ci-reuse-build-for-runtime-regressions 7c3574a ci: let the pre-merge Release check compile arm64 only (manaflow-ai#13195) 887839a ci: drop a stalled GhosttyKit download and resume it (manaflow-ai#13197) 70a244d Merge pull request manaflow-ai#13177 from manaflow-ai/ci-fast-static-preflight fcad43f build: read Xcode projects with Foundation and drop XcodeProj and PathKit (manaflow-ai#13111) 76d80b1 ci: skip Release and its helper for test-only pull requests (manaflow-ai#13122) fdc63e9 Merge pull request manaflow-ai#13176 from manaflow-ai/ci-reuse-queue-build-products 3162fee test: split an expression Xcode 27 cannot type-check (manaflow-ai#13126) d10aa64 test: use consistent XCTest imports to stop compiler diagnostic flood (manaflow-ai#13163) 1b69bf9 test: stop real-Git reftable tests depending on a 2s wall clock (manaflow-ai#13186) cad333b Merge origin/main into ci-fast-static-preflight 7522486 Merge origin/main into ci-reuse-build-for-runtime-regressions 43210e1 Bound automatic terminal titles before session persistence (manaflow-ai#13009) 674a0db ci: retire Depot macOS runners (manaflow-ai#13162) f48ef36 Merge pull request manaflow-ai#13183 from manaflow-ai/ci-early-cli-smoke ebbb17f ci: skip app-host teardown when setup never started (manaflow-ai#13179) 5fb6d8c Merge pull request manaflow-ai#13168 from manaflow-ai/ci-cache-r2-store a348064 ci: skip compile admission when an earlier run compiled the same build inputs (manaflow-ai#13139) 88e102c reload: let a reused checkout keep one warm DerivedData across tags (manaflow-ai#13131) 7a049e9 Merge origin/main into ci-reuse-build-for-runtime-regressions cd05c6e Merge origin/main into ci-fast-static-preflight 5cf41fa Merge origin/main into ci-reuse-queue-build-products 5a6322e test: guard early CLI smoke ordering 0438552 fix: pass R2 public URL through workflow environment 0716c59 test: bound app-host replay subprocesses 2e0b9b5 ci: terminate cancelled focused discovery 14bbad4 ci: keep R2 public URL configuration inside the cache actions e342c67 ci: make focused run discovery cancellable cf3984b test: avoid hard timeout in app-host classifier replay 251b050 ci: allow privileged crash report collection 7d9a7f2 Merge main after landing cache backend and suite policy b6853ee ci: allow manual cache-only seeding for R2 rollout 81d3026 test: require manual cache seeding to skip app publication 6980f8e ci: harden remote tmux diagnostics collection c24d77f ci: publish R2 cache pointers conditionally and repair failed writes 2432805 test: cover R2 pointer repair and out-of-order saves 4779d01 ci: continue past unusable build artifact candidates 9dd1579 test: reproduce corrupt candidate blocking product reuse bfb43f5 ci: check CLI version and help before app-host fan-out f2b0fae docs: use an existing suite in focused launcher example 2c04b6a ci: drain tar streams portably with BSD tar c5e1d59 ci: pin focused tests to a commit and track the requested run 1a44bde ci: consume tar padding when restoring zstd caches 31d4fd9 test: cover padded R2 archives on macOS a46567a ci: isolate R2 cache writes from release credentials ce26a8e test: require early CLI smoke gate to propagate probe failures 18a67fb test: reproduce focused launcher revision and run attribution bugs 4dd543e test: require cache-only R2 credentials for cache saves 2c8412c ci: make product reuse attempt-safe and bound archive expansion 59fb526 ci: preserve remote tmux mirror crash diagnostics d8107e4 test: cover artifact reruns, expansion limits and producer source checks 28a03e3 ci: reject interrupted app-host runs despite later passing summaries 302551d test: reproduce false-green app-host timeout and restart runs bc3a63a ci: reject invalid static inputs before expensive validation baf65d9 test: require successful static preflight before macOS admission 6cea5f0 ci: fall back when build identity cannot be established 7632c7e ci: reuse compatible compiled products in merge groups 8be0c54 ci: add an R2 bucket as a cache store every runner can read 25f50c3 test: behaviour of an R2-backed cache store script 17c2498 ci: reuse compiled app and UI products for runtime regressions 6ed96f4 test: require UI products in the shared CI build artifact 230ad52 ci: drop a timeout note about a DerivedData cache that no longer exists b5ec5cc ci: stop restoring DerivedData in pull request jobs a42ad38 Merge remote-tracking branch 'origin/main' into ci-cache-backend-switch 477fb0f ci: choose the cache store per dispatched run, and cover the nightly app build 03363d7 ci: let a repository variable move the seeded caches to the Warp store f791f87 ci: pull request jobs restore caches and never save them 5b65bb1 test: pull request jobs must restore caches read-only
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RemoteTmuxMirror app-host crashes currently leave their crash reports on the runner, so a failed CI run loses the evidence needed to investigate #9348.
When the focused RemoteTmuxMirror step fails, collect crash reports from
$CMUX_APP_HOST_HOME/.local/state/cmux/crash/and the existing$RUNNER_TEMP/cmux-remote-tmux-mirror-*.txtper-suite attempt logs before app-host cleanup. XCTest uses an isolated home, so the runner's$HOMEis not the report location. Upload the files ascmux-remote-tmux-mirror-diagnostics-<shard>-<run_attempt>with seven-day retention.Collection and upload are best effort. The existing retry policy and test failure result are unchanged. This adds evidence for the crash investigation; it does not fix the crash or collect runs that pass after a retry.
Validation:
actionlint .github/workflows/ci.ymluv run --with pyyaml python tests/test_ci_app_host_home_isolation.pypython3 tests/test_ci_cmux_unit_test_shard.pygit diff --checkWorkflow-only change. No app build or live crash reproduction was run; artifact upload will be exercised by the next focused-step failure in GitHub Actions.
CI census: #13095 (comment)
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@codesmith-botwith what you need. Autofix is disabled.Summary by cubic
Preserves RemoteTmuxMirror crash diagnostics when the focused remote tmux mirror step fails, so failed CI runs keep the evidence needed to investigate app-host crashes. Previously crash reports were removed during app-host cleanup; the workflow now copies them and the per-suite attempt logs into a diagnostic artifact with seven-day retention.
$HOME, validating the published app-host identity before resolving it, with asudofallback.cmux-remote-tmux-mirror-diagnostics-<shard>-<run_attempt>.Written for commit 251b050. Summary will update on new commits.
Summary by CodeRabbit