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…til the manifest write has landed The "declared by a registry package" case of "peer no published version satisfies" resolves from scratch a second time and asserts the registry is not contacted, which needs both manifests in the manifest cache. Cache entries are written by a thread pool task that bun install does not wait for, and peer-target's manifest is the last thing the first install fetches, so under load that install sometimes exits before the entry is on disk and the second resolve requests /peer-target again. A resolve that had to refetch the manifest writes the entry again, so repeat the from-scratch resolve (a few attempts at most) until one ran without contacting the registry, and keep asserting the warning and the identical lockfile on every attempt.
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Updated 6:11 PM PT - Aug 15th, 2026
✅ @robobun, your commit 258f9f78d671e862738494e4113e51121660b621 passed in 🧪 To try this PR locally: bunx bun-pr 39190That installs a local version of the PR into your bun-39190 --bun |
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Status: reproduced and fixed, test-only. Head is 258f9f7.
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WalkthroughChangesUnmet-peer reinstall validation
Possibly related PRs
Suggested reviewers: 🚥 Pre-merge checks | ✅ 4✅ Passed checks (4 passed)
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In `@test/cli/install/bun-lock.test.ts`:
- Around line 1780-1787: In the retry loop around install, define a named
maxAttempts constant with value 5 before the loop and replace the inline attempt
=== 5 comparison with attempt === maxAttempts; preserve the existing retry and
break behavior.
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test/cli/install/bun-lock.test.ts
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LGTM — bounded retry that keeps the original invariant.
What was reviewed:
- The final
expect(registry.requests).toEqual([])still runs after the loop, so 5 consecutive cache misses still fail the test (verified against the PR body'sdisableManifestcheck). - Each attempt still asserts the unmet-peer warning and byte-identical lockfile, so a retry that took the wrong path is caught immediately rather than masked.
- The
install()helper's 30s spawn timeout means the original #38851 infinite-loop regression would still be caught on the first warm-cache attempt. - Confirmed the sibling "declared by the root package and a workspace" case does not depend on the async manifest write and needs no equivalent change.
Extended reasoning...
Overview
Test-only de-flake of one case in test/cli/install/bun-lock.test.ts ("declared by a registry package" under the "peer no published version satisfies" describe). The final from-scratch resolve step is wrapped in a bounded retry loop (max 5 attempts) that breaks once an attempt runs without contacting the registry. The unmet-peer warning and lockfile-identity assertions move inside the loop so they run on every attempt; the zero-requests assertion stays after the loop unchanged.
Security risks
None. This touches only test control flow — no runtime code, no new inputs, no changes to what is asserted.
Level of scrutiny
Low-to-medium. It is a de-flake, and REVIEW.md is explicit that de-flakes must keep asserting the property the original assertion protected. That holds here: the property is "a resolve with both manifests cached does not contact the registry and does not loop forever", and the retry only accommodates the documented fire-and-forget manifest cache write (Serializer::save_async, deliberately not joined per #37203). The retry is bounded, each iteration re-asserts the observable outputs, and the terminal toEqual([]) guarantees at least one attempt exercised the warm-cache synchronous-lookup path that #38851 fixed. The PR body demonstrates the new shape still fails with install.cache.disableManifest, so it cannot pass by retrying its way past a real regression.
Other factors
- Precedent: #37203 reverted an install-side wait for these writes in favour of test-side accommodation, and #38580 did the same for another test, so fixing this test-side rather than joining the thread pool is the established choice.
- The loop replaces a single-shot check with a bounded poll for the actual condition (cache warm), which is exactly what the test guidance prefers over sleeps.
- The sibling test case only asserts requests after the cold first install and is correctly left alone.
- The added comment is specific (names the mechanism, references #37203, quantifies the failure rate) and earns its length by explaining a non-obvious retry.
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LGTM — test-only de-flake that wraps the warm-cache resolve in a bounded retry without weakening the assertion it protects.
What was reviewed:
- The final
expect(registry.requests).toEqual([])is preserved and the warning/lockfile-identity checks now run on every attempt, so the property under test is not weakened; the PR body confirms it still fails with the manifest cache disabled. - The retry is a bounded poll (5 attempts, no sleep) with a comment citing #37203, matching the established pattern for
save_asyncraces (#37203, #38580). - Checked that the sibling "declared by the root package and a workspace" case does not depend on the same write — it only asserts requests after the cold install, so leaving it unchanged is correct.
Extended reasoning...
Overview
Test-only change to test/cli/install/bun-lock.test.ts, specifically the "declared by a registry package" case in the "peer no published version satisfies" describe block. The from-scratch resolve step (previously run once) is now wrapped in a for loop bounded at 5 attempts that breaks on the first iteration with zero registry requests. Each iteration clears the lockfile, node_modules, and request log before installing, then asserts the unmet-peer warning and byte-identical lockfile. The terminal expect(registry.requests).toEqual([]) is unchanged.
Security risks
None. Test-only change; no production code, no new inputs, no new network surface.
Level of scrutiny
Low-to-medium. This is a targeted flaky-test fix with a thoroughly documented root cause (the manifest cache write is a fire-and-forget thread-pool task per Serializer::save_async, and peer-target's manifest is the last fetch with nothing after it to give the write time). The key question per REVIEW.md is whether the retry silently weakens the assertion — it does not: the zero-requests check still runs after the loop, so a run where the cache never warms still fails, and the PR body verified this by setting install.cache.disableManifest and observing failure after 5 attempts. The per-attempt assertions on the warning and lockfile actually strengthen coverage over the original single-shot.
Other factors
- The approach follows established precedent: #37203 explicitly reverted an install-side wait for these writes in favour of test-side handling, and #38580 applied the same pattern to another test.
- The bounded-poll shape (no sleep, deterministic exit condition, explanatory comment naming why no better observable signal exists) matches the repo's test guidelines on awaiting conditions.
- The one CodeRabbit nit (name the retry bound) was addressed in commit 3af43b2 — the loop now uses
const maxAttempts = 5with a standard boundedfor. - The sibling case in the same describe block was correctly left alone; its request assertion is only on the cold first install and does not depend on the async cache write landing.
- The PR body includes empirical reproduction data (52/400 under load) and a simulation that reproduces the exact CI failure output, which is more evidence than most de-flake PRs carry.
…r re-resolve instead of retrying it Check the project's cache for both manifest entries before the from-scratch resolve and re-run the install (without the lockfile) until they are there, then run the resolve once with its zero-requests assertion unchanged. The retry now only re-establishes the precondition that the fire-and-forget manifest write can leave unmet, so a refetch during the resolve itself fails the test on the first run.
robobun
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LGTM — targeted, test-only de-flake with a clear root cause and bounded retry.
What was reviewed:
- The warm-up loop polls the observable condition (
*.npmfiles on disk) with a hard bound of 5, andexpect(cachedManifests).toBe(2)fails loudly if the cache never warms — no silent weakening. - The load-bearing assertion (
registry.requestsempty on the warm-cache resolve) is unchanged; verified the retry cannot mask a regression since the manifest-cache-disabled case still fails per the PR body. cacheDir()extraction is behavior-preserving;Bun.Glob.scanSyncover the per-project cache dir is safe (max 2 entries, own cache dir per test).- Checked that the final install cannot itself race: with both manifests cached it makes no fetch, so no
save_asyncis scheduled.
Extended reasoning...
Overview
This PR touches a single test file, test/cli/install/bun-lock.test.ts, adding ~24 lines to the "peer no published version satisfies" > "declared by a registry package" case. It extracts a cacheDir(cwd) helper (previously inlined), adds a cachedManifests(cwd) helper that counts *.npm entries in the project's manifest cache via Bun.Glob, and inserts a bounded warm-up loop before the final from-scratch resolve. The loop re-resolves (up to 5 times) until both manifest entries exist on disk, then asserts they do. No production code is touched.
Security risks
None. Test-only change confined to a hermetic in-process registry and per-project temp cache directory. No new inputs, no external network, no changes to install logic.
Level of scrutiny
Low-to-medium. This is a de-flake of a test that failed once in CI, with an exceptionally thorough root-cause writeup: the fire-and-forget save_async manifest write in src/install/npm.rs can be lost if the process exits first, and peer-target's manifest is the last thing fetched with nothing after it to give the write time. The fix is test-side by design (precedent: #37203 reverted an install-side wait; #38580 fixed a sibling test the same way). The key REVIEW.md concerns for de-flakes are met: it polls an observable condition rather than sleeping, the bound is explicit, and the property the original assertion protected (zero requests on a warm-cache resolve, i.e. the synchronous-lookup path terminates) is still asserted exactly once, unchanged.
Other factors
- The head commit (258f9f7) reshaped the fix from "retry the asserting resolve" to "warm the cache first, then run the asserting resolve once" — cleaner because the assertion step itself is not inside a retry. The PR description and resolved CodeRabbit thread describe the earlier shape, but the thread is resolved and the final shape is simpler.
- The filesystem check after each subprocess exit is race-free: once the child exits, its thread-pool write either landed or was lost, so counting
.npmfiles is deterministic. - The retry loop's install omits the
node_moduleswipe, which is fine — its only job is to trigger another manifest fetch/write; the actual test step still wipesnode_modulesand clearsregistry.requests. cachedManifestscan only reach 2 (the registry serves exactly two manifests, and each test gets its own cache dir), so< 2andtoBe(2)are consistent.- The
5literal is back inline after the reshape, but it's a self-evident retry count in a two-line loop header; not worth blocking on.
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This flake is still present on main. The same assertion ( The cause in the PR body still holds at current main: |
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Update at main 24944aa. The flake is now much more frequent. In the last 400 Buildkite builds (about 18 hours) the "declared by a registry package" case appears in the flaky annotation of 162 builds, on every platform. The failure is the same one this PR fixes: The manifest cache write is atomic and Checked this PR against main 24944aa:
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Keeping this open for now. #40073 (the harness flag that makes Checked on the #40073 branch with this test unmodified:
The remaining cause is a temp file name collision in The reinstall loop here covers the missing entry (count below 2) but not the invalid one (count is 2, the from-scratch resolve deletes the entry and fetches it). The fix belongs in |
### Problem - `test/cli/install/bun-lock.test.ts` > "peer no published version satisfies" > "declared by a registry package" (from #38851) fails on main about every fourth build (build 104990). `expect(registry.requests).toEqual([])` at bun-lock.test.ts:1778 receives `["/peer-target"]`: the manifest cache has no usable entry for `peer-target`. It has two causes. #40073 covers the first, the `save_async` exit race. This PR fixes the second. - `Serializer::save` (src/install/npm.rs:1352) named the temporary file `<name hash>.npm-<milliseconds>` in the temporary directory every bun process shares. The four concurrent peer tests all save `peer-target`, and two saves in one millisecond opened one file. Windows, release build, four installs saving one package at once: 77 of 80 lost their entry. Linux uses `O_TMPFILE` today; #38916 starts using the name on Linux too, so this fix has to land first. ### Fix - `Serializer::save` names the file with `FileSystem::tmpname`, as `TarballStream` already does. Correct because the name no longer depends on anything two processes share. - Two tests in `bun-install-registry.test.ts`: four synchronized installs keep their own valid entries, and an install still caches its manifest when directories occupy the old temporary names. The second fails 3 of 3 on Windows without the fix and passes 5 of 5 with it. The test registry serves the tarball only after the cache entry exists, so neither test depends on the exit race. - Verified: `bun bd test test/cli/install/bun-install-registry.test.ts` (250 pass) on Linux, both new tests on Windows. ### Background - Manifest cache: each fetched manifest is serialized to `<cache dir>/<name hash>-<registry hash>.npm`. Within the response's `max-age`, a later install resolves from that file and makes no request. - `write_file` opens the temporary file with `O_CREAT | O_TRUNC`, writes, then renames it into the cache. Two processes on one name write one file. On macOS the second rename fails and the first cache holds the second's bytes, which `load_by_file` rejects. On Windows `rename_at_w` moves by handle, so the second rename moves the file out of the first cache again. - The exit race: `save_async` writes the entry from a thread pool task that `bun install` does not wait for, by design (#37203). The test change in #39190 works around it for the bun-lock test. The harness flag in #40073 removes it from every install test. <details><summary>Notes</summary> Probe (Windows, 16 vCPUs): one registry and one project per install, `dependencies: { "peer-target": "2.0.1" }`, each registry holds its manifest response until all four have been asked, then all respond at once. After exit, the `.npm` entry is read and checked for the install's own registry origin. | binary | temp dir | rounds | ok | missing | wrong registry | | --- | --- | --- | --- | --- | --- | | 1.4.1-canary.1 (release, unfixed) | shared `%TEMP%` | 20 | 3 | 60 | 17 | | 1.4.1-canary.1 (release, unfixed) | shared, responses not synchronized | 40 | 135 | 17 | 8 | | 1.4.1-canary.1 (release, unfixed) | one per install | 40 | 160 | 0 | 0 | | debug, unfixed | shared | 20 | 74 | 3 | 3 | | debug, this branch | shared | 20 | 80 | 0 | 0 | The unfixed debug build loses far fewer entries than the release build because its slower parse spreads the four saves over several milliseconds. That is also why the concurrent test detects the bug almost always on release lanes and only sometimes on a debug build. The directory test fails deterministically on a debug build (3 of 3 and, in an earlier shape of the test, 5 of 5 on Windows). Windows mechanism in detail: `open_file_at_windows` maps `O_CREAT | O_TRUNC` to `FILE_OVERWRITE_IF` with `FILE_SHARE_READ | WRITE | DELETE`, so every process opens and truncates the same file. `rename_at_w` (src/sys/windows/mod.rs:1933) opens the source by path and then moves it by handle. When two processes have opened the path before either moves it, both moves succeed: the second one relocates the file out of the first process's cache. That process sees a successful save and has no entry, which is the "no entry, no error" case in the probe. `FileSystem::tmpname` (src/resolver/lib.rs:198) formats `.<random ^ nanoseconds>-<counter>.<ext>`. The temporary directory probe in `PackageManagerDirectories.rs` and `TarballStream::open_destination` use it the same way. Test registry and the exit race: both new tests read the cache after the install exits. To keep them independent of the `save_async` exit race, the registry answers the tarball request only once a `.npm` entry exists in the project's cache (polling with a 5 second deadline, after which it answers anyway so a lost write ends as a failed assertion instead of a hang). The tarball is requested after the manifest is parsed, so the install cannot finish before its entry is on disk. Sequencing: #38916 changes the Linux `O_TMPFILE` path to link the file into the temporary directory under `tmp_path` before renaming it over an existing entry, which makes the name load-bearing on Linux. This PR should land before it. #39190 (the bun-lock warm-up loop) and #40073 (harness flag) handle the exit race; an earlier shape of this PR carried #39190's commit, which the self-review flagged as a duplicate of an open PR, so it was dropped. Gate: the fixed code path is not reachable on Linux today (`O_TMPFILE`), so the new tests pass on Linux with and without the fix. The fail-before proof is the Windows run above. Also run: `cargo clippy -p bun_install`, clean. </details> <!-- robobun:evidence:begin --> --- **no test proof** · iteration 0 · platform-specific test(s) that do not run on this machine, deferring to CI, which covers all platforms: test/cli/install/bun-install-registry.test.ts, test/cli/install/bun-lock.test.ts <!-- robobun:evidence:end -->
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Update at main ca41503. The flake is still frequent on PR builds, and this change still fixes it.
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Problem
test/cli/install/bun-lock.test.ts> "peer no published version satisfies" > "declared by a registry package" (added in install: stop looping on a peer dependency no published version satisfies #38851) is flaky: its last step resolves from scratch and assertsexpect(registry.requests).toEqual([]), and it received["/peer-target"]in 3 of the last 30 main builds (98704 on Windows, 98827 on macOS, 98850 on Linux) and on build 98343 for install: name satisfies_dependency_version's range-side arguments after the dependency #39127.Serializer::save_async(src/install/npm.rs:1245), a thread pool task thatbun installdeliberately does not count as pending, and nothing joins the pool before the command exits. peer-target's manifest is the last thing the first install fetches and nothing is downloaded after it, so under load the process exits before the entry is renamed into place and the write is lost.--frozen-lockfileinstall in between does not look the peer up (with the entry deleted it makes no request), so the from-scratch resolve is the first install to notice and fetches/peer-targetagain.Fix
.npmentries in the project's cache (cachedManifests, next to theinstallhelper, whose comment namessave_asyncas the reason) and, while there are fewer than two, removes the lockfile and installs again, at most five times; an install that has to fetch the missing manifest writes its entry again. It then asserts the count is two and runs the from-scratch resolve exactly once, with its zero-requests assertion unchanged.install.cache.disableManifest: fails withExpected: 2, Received: 0on both linkers).setupWithCachedManifests, same count-and-reinstall shape) do the same for two other tests. A harness-set flag that madesave_asyncwrite inline for test-spawned installs would cover all of these tests at once (the shape ofBUN_DISABLE_SLOW_FILESYSTEM_WARNINGfrom install: add BUN_DISABLE_SLOW_FILESYSTEM_WARNING, set it in the test harness #37000); that adds a test hook tobun installitself, so it is left as a separate decision and not attempted here.bun bd test test/cli/install/bun-lock.test.ts, 40 pass, the retry loop not entered. With the lost write simulated (peer-target's entry removed after the frozen install) the test at main fails with the output above and this version passes after one extra install; with the manifest cache disabled it fails at the count assertion. Test-only change, so there is no build on which the unmodified test fails deterministically; the evidence is the probe and the simulation.Background
bun installfetches is serialized into<BUN_INSTALL_CACHE_DIR>/<hash>.npmtogether with the response'smax-age; within that window later installs resolve the package from that file without creating a network task. The test registry sendsmax-age=300and each project gets its own cache directory, so the count of.npmfiles is the number of manifests that project has cached.save_asyncclones the parsed manifest into a thread pool task that writes a temporary file and renames it into the cache directory. Its doc comment says the cache is optional and the task is not tracked, so a write still in flight when the process exits is lost and the next install simply fetches the manifest again. In a normal install the tarball downloads that follow the manifests give the writes plenty of time; this test's last manifest has nothing after it.Probe and simulation
Probe: the test's registry and project, one fresh project and cache directory per iteration, counting
.npmfiles in the cache afterbun installexits, with Nwhile :; do :; doneloops running alongside.Simulation with the debug build at 7d50fe5, removing peer-target's entry after the first install:
The same removal inserted into the test: the version on main fails both linkers with
+ "/peer-target"; this version passes both, with one extra install each. Withinstall.cache.disableManifest = trueinstead, this version fails both linkers atexpect(cachedManifests(...)).toBe(2)after five extra installs.Earlier shape of this PR
The first version wrapped the from-scratch resolve itself in a loop that repeated it until an attempt made no requests. Review pointed out that this retried the step carrying the assertion, so a resolve that intermittently contacted the registry with a warm cache would have been retried rather than reported. The current version retries only the setup and runs the resolve once.
no test proof · iteration 0 · Platform-specific test-only change; deferring to CI.