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## Why Recent `rust-ci-full` failures were dominated by transient Windows timeout clusters in process-heavy tests such as `suite::resume`, `suite::cli_stream`, `suite::auth_env`, `start_thread_uses_all_default_environments_from_codex_home`, and `connect_stdio_command_initializes_json_rpc_client_on_windows`. The goal here is to make those known flaky paths less likely to fail full CI without relaxing the global nextest timeout policy. ## What changed - Enable one global nextest retry with `retries = 1` so a single transient failure can recover. - Add a `windows_process_heavy` test group with `max-threads = 2` for the recurring Windows subprocess/session-heavy timeout families. - Add Windows-only slow-timeout overrides for that process-heavy group. - Add a narrower Windows-only timeout override for `start_thread_uses_all_default_environments_from_codex_home`, which still exceeded the broader Windows bucket in both Windows full-CI lanes. - Increase the `rust-ci-full` nextest job timeout from `45m` to `60m` so Windows ARM64 still has job-level headroom after retries and targeted per-test timeout increases. - Keep the global `slow-timeout` unchanged at `15s`. ## Validation Validated through `rust-ci-full` GitHub Actions reruns on this PR. Observed improvement on the tuned Windows lanes: - Windows x64 went from `5 timed out` to `0 timed out`. - Windows ARM64 went from `2 timed out` to `0 timed out`. - `start_thread_uses_all_default_environments_from_codex_home` recovered as a flaky pass on Windows ARM64 instead of timing out. The remaining failing tests in those runs were unrelated hard failures outside this nextest timeout tuning.
Workflow Strategy
The workflows in this directory are split so that pull requests get fast, review-friendly signal while main still gets the full cross-platform verification pass.
Pull Requests
bazel.ymlis the main pre-merge verification path for Rust code. It runs Bazeltestand Bazelclippyon the supported Bazel targets, including the generated Rust test binaries needed to lint inline#[cfg(test)]code.rust-ci.ymlkeeps the Cargo-native PR checks intentionally small:cargo fmt --checkcargo shearargument-comment-linton Linux, macOS, and Windowstools/argument-comment-lintpackage tests when the lint or its workflow wiring changes
Post-Merge On main
bazel.ymlalso runs on pushes tomain. This re-verifies the merged Bazel path and helps keep the BuildBuddy caches warm.rust-ci-full.ymlis the full Cargo-native verification workflow. It keeps the heavier checks off the PR path while still validating them after merge:- the full Cargo
clippymatrix - the full Cargo
nextestmatrix - release-profile Cargo builds
- cross-platform
argument-comment-lint - Linux remote-env tests
- the full Cargo
Rule Of Thumb
- If a build/test/clippy check can be expressed in Bazel, prefer putting the PR-time version in
bazel.yml. - Keep
rust-ci.ymlfast enough that it usually does not dominate PR latency. - Reserve
rust-ci-full.ymlfor heavyweight Cargo-native coverage that Bazel does not replace yet.