PTY snapshot suite: rare non-repeating case failures under parallel load (pass in isolation)
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调研方向
从 just snapshot-test migration 和 PTY snapshot runner 开始，使用 rust-toolchain.toml 以及列出的 migration fixtures 作为复现环境。比较冷缓存并行运行与隔离运行和热缓存运行，并添加建议的计时、详细程度或重试检测。完成的标准是解释清楚对负载敏感的失败，并且 migration suite 不再产生无法解释的间歇性失败。
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描述
Summary
Running the full migration* PTY snapshot suite in parallel occasionally fails a small, non-repeating set of cases (~0.4% of case-executions). Every affected case passes deterministically when run in isolation, and the failing names differ between runs — so this looks like load-sensitivity in the PTY runner environment rather than any individual fixture or product bug. Filing per m0g3r's suggestion in #2483 after it showed up there first.
Observations (macOS arm64, M-series, just snapshot-test migration)
Five full-suite runs across two commits, all with a fresh packages/cli/dist (freshness guard green):
| run | commit | result | failed cases |
|---|---|---|---|
| A | 31163c5 (PR #2483 branch) |
151/154 | migration_dynamic_oxc_configs, migration_framework_shim_vue, migration_standalone_yarn4_idempotent |
| B | cc20535d (main) |
159/161 | migration_not_supported_vitest3, migration_from_tsup_monorepo_success |
| C | cc20535d (main) |
161/161 | — |
| D | cc20535d (main) |
161/161 | — |
| E | 31163c5, earlier same-day |
148/154 | different set again (incl. migration_husky_or_prepare, migration_standalone_bun_install) |
- No case name repeats across runs. Union of failures over five runs: 10+ distinct fixtures, each failing exactly once.
- Every one of them passes in isolation (
just snapshot-test <name>), immediately after the failing run, unchanged tree. - The failure-heavy runs were the first suite run after a fresh build / cold caches; warm re-runs (C, D) were fully green. Cold-state work on first touch (managed runtime provisioning, registry-bridge first hits) overlapping with ~14 parallel PTY cases is my best guess at the mechanism, but I have not isolated it.
- m0g3r additionally verified in #2483 that the flaked fixtures are structurally unremarkable (step counts mid-pack; one of 21 double-
vp migratefixtures).
Why it may matter
Locally it's a shrug; in CI a 0.4% per-case flake across ~650 cases makes a meaningful fraction of runs red for reasons unrelated to the diff under test, and the changing names make it hard for contributors to tell signal from noise (it cost a round of triage on #2483).
Environment
- macOS arm64 (Darwin 25.2), 14 threads reported by the runner
just snapshot-test migration(both flavors), toolchain perrust-toolchain.toml
Happy to re-run with any added instrumentation (timings, per-case retries, runner verbosity) if that helps narrow it — I can reproduce roughly one flaky run per two or three cold full-suite runs.
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