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StatusReproduced on 1.4.3-canary.1 (09bb546) with a registry stub on loopback that answers the first manifest request with 404 and is healthy afterwards:
The same steps fail the same way for a 500, a dropped connection and an unparseable manifest.
CIThe branch is rebased onto c6b7fcb (#42851, LLVM 23.1.1 and the new Rust nightly). On the old base the |
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Included review availability: Your plan provides up to 10 included reviews per hour; 1 remains after this review. WalkthroughThe package manager now tracks failed manifest tasks, releases network tasks consistently, and clears failed deduplication state after resolution. CLI tests verify retries across registry failures, recovery, multiple module resolution APIs, and ASAN leak coverage. ChangesManifest failure retry handling
Priority: ➖ Normal Merge Risk: ⚪ Minimal · up to The implementation has no remaining identified merge-blocking issue. 🚥 Pre-merge checks | ✅ 4✅ Passed checks (4 passed)
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src/install/PackageManager/runTasks.rs— Servers that auto-install at request time and keep failing on one package will watch their outbound fetch() concurrency drop on each failing call, one halving per attempt, until it reaches 4. The call at runTasks.rs:480 fires on every pass with a download_failed manifest, and after this PR every failing resolve re-enters that path because the dedupe entry no longer survives the resolve. The dismissal counted on the default retry count reaching the floor on base; with BUN_CONFIG_HTTP_RETRY_COUNT set low (the value the PR's own tests pin to 1) base halves at most twice per process while this branch keeps halving. Fix: do not throttle again for a task id that already throttled, or restore the cap when the runtime resolve returns.Extended reasoning...
runTasks.rs:475-481: DownloadOutcome::of marks failed when the response has no metadata and no proxy status (dropped connection, refused, DNS). throttle_after_network_error (1989) then halves AsyncHTTP::max_simultaneous_requests, a static shared with fetch() and every other AsyncHTTP user (HTTPThread.rs:814). has_network_error is a per-pass local, so each retry pass halves again. Base: the dedupe entry made the name unresolvable after that, so total halvings per process = attempts of one lookup. This PR: forget_failed_manifest_tasks (1979) clears the entry after each resolve; enqueue at PackageManagerEnqueue.rs:1143 sees no entry and issues a new request; the throttle fires again. With BUN_CONFIG_HTTP_RETRY_COUNT=1 (the PR's own test setting) base ends at 64, this branch reaches 4 after four more failing calls. With BUN_CONFIG_MAX_HTTP_REQUESTS raised the gap is larger. Nothing ever raises the cap. Population: any runtime process using auto-install plus fetch() against a flaky registry. Remedy: throttle once per task id, or restore the cap after the runtime resolve.
Verification: nit (widens a pre-existing process-lifetime throttle; in the default config the base already reaches the floor by the same route). Triggering condition: runtime auto-install (no node_modules), a package whose manifest lookup fails at the connection level (refused/dropped/DNS:
DownloadOutcome::ofat /home/claude/bun/src/install/PackageManager/runTasks.rs:1713-1721 setsfailedwhenmetadata…
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Updated 2:54 AM PT - Sep 16th, 2026
✅ @robobun, your commit 06e82e652516e8a52c61984d4e1db10b20207f30 passed in 🧪 To try this PR locally: bunx bun-pr 42883That installs a local version of the PR into your bun-42883 --bun |
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About the review finding on
The PR notes now list it under "Not covered". |
…lookup The runtime keeps one PackageManager for the life of the process. A manifest request that failed (404, 5xx, dropped connection, unparseable body) stayed in network_dedupe_map as "already requested", so every later resolve of that package name failed without a request, also after the registry recovered. run_tasks now records a manifest task that ended without a manifest and drops its task_queue waiters. VirtualMachine drops the recorded dedupe entries after each resolve: both resolver passes of one resolve share one lookup, and the next resolve asks the registry again. bun install never drops them, so one install run still asks for and reports a package once. The two network-level manifest failure exits never returned the NetworkTask to its pool. A lookup per failing resolve would leak one per call, so they now return it, through the same helper as the two existing release guards.
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Inline comments:
In `@src/install/PackageManager/runTasks.rs`:
- Around line 1969-1972: Update the failed-task cleanup around
failed_manifest_tasks.drain and the surrounding resolve flow to preserve
failures owned by an active outer resolve. Track resolve depth or a resolve
generation, and defer removing failed task IDs from network_dedupe_map and
task_queue until the outermost resolve exits, preventing nested resolves from
issuing duplicate manifest requests.
In `@test/cli/run/run-autoinstall.test.ts`:
- Line 235: Replace the manual Object.entries(failures) loop with a
describe.each() parameterized suite, keeping a single shared test body for every
failure mode and preserving the existing respond, requestsPerLookup, and busy
values.
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src/install/PackageManager.rssrc/install/PackageManager/runTasks.rssrc/jsc/VirtualMachine.rstest/cli/run/run-autoinstall.test.ts
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The wait of a runtime lookup runs the JS event loop, so a microtask can resolve inside it. That nested resolve ended first and dropped the failed record of the outer lookup, whose second resolver pass then asked the registry again. The records are now dropped only when no lookup waits. The failure cases in the test use test.each.
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This is Claude (an AI assistant) writing on Jarred's behalf. Included in #44968, in a different form: a failed lookup is remembered until the event loop has gone around once, then the registry is asked again. |
Problem
node_modules), one failed registry lookup makes that package unresolvable until the process exits. Every laterrequireorimport()of it fails in 0.1 ms with no request, also after the registry recovers.run_tasks(src/install/PackageManager/runTasks.rs) only log. The task stays innetwork_dedupe_map, and the runtimePackageManagerlives as long as the process.enqueue_dependency_to_rootthen sees "already requested" and returnsNotFound.Fix
run_tasksrecords a manifest task that ended without a manifest infailed_manifest_tasks, and drops itstask_queuewaiters. It does so at all three failure exits, for both callback sets.VirtualMachine::resolve_maybe_needs_trailing_slashcallsforget_failed_manifest_tasksafter each resolve._resolveruns the resolver twice on a miss. Both passes share one lookup, and the next resolve asks again.bun installnever calls it.NetworkTask, once per name. A lookup per failing call would leak once per call, so they now return it to the pool.test/cli/run/run-autoinstall.test.ts, 9 new tests. All 9 fail on an ASAN build of main (2 need LeakSanitizer). Self-reviewed: 3 concerns raised, 3 addressed.Background
node_modulesup the tree, the resolver asks the in-processPackageManagerfor a package's manifest and tarball, then blocks.network_dedupe_mapholds the task ids already requested.task_queueholds the dependencies that wait for each. Both serve onebun installrun, which wants one request per package.AsyncModule::Queue::on_poll. Each has its own error callbacks.Notes
Cost. Under live auto-install every failing resolve now asks the registry. Before, only the first did. A 404 is 1 request per call. A 5xx or a dropped connection is 1 + 5 requests per call (the default retry count), back to back. The call blocks the JS thread for that time. With the defaults of #40009 (retry backoff, open) a fully retried failing lookup would wait about 7.75 s per call. A
node_modulesfolder or--no-installavoids all of it. The wait still runs the JS event loop (#36159 removes that), so each failing call enters that window again. Before, only the first call did.A 404 is retried like the other failures. Verdaccio with default settings answers 404 when its uplink is down.
Not covered. Measured on this branch, each still sends 0 requests after the registry heals:
Not measured, read in
PackageManagerEnqueue.rs: three exits fail before a request exists and leave the dedupe entry. They areinstall.offline = truewith no cached manifest, an exact version insideminimumReleaseAge, and a manifest URL thatfor_manifestrejects. They fail the same way on every call until the configuration, the clock, or the disk cache changes.The
NetworkTaskis still not returned at the 304 exits and at the tarball failure exits. They run once per task id, as on main, and this PR does not make them repeat.A connection-level failure also halves the HTTP concurrency cap that
fetch()shares (throttle_after_network_error), and nothing restores it. On 1.4.3-canary one failed lookup with the default 5 retries takes it from 256 to 4: a burst of 64fetch()calls peaks at 64 in flight before a failedrequire()and at 4 after it. With the defaults this PR does not change that. With a lowerBUN_CONFIG_HTTP_RETRY_COUNT, later failing resolves continue the halving. That is a separate bug and is reported separately.Order against other open PRs.
unsafeinsrc/install) deletespreallocated_network_tasks. If it lands first,release_network_taskand its five call sites drop out. The record and forget half moves onto the exits of itsprocess_network_taskunchanged. If this PR lands first, the helper is one function to delete there. I can rebase onto install: remove every unsafe from src/install #40284 if that order is preferred.BUN_CONFIG_HTTP_RETRY_COUNT=1. A retried lookup is then exactly two requests, and with backoff it waits one step.failed_manifestsmap with the lifetime of the manager. The forget would have to drain that too.Measured, registry stub on loopback:
require()calls of one name: 1.4.3-canary sends 1 request, this branch 2001 (one per resolve, not two).require,require.resolve,Bun.resolveSync,import.meta.resolve,import(),Bun.resolve. So dobun repl(the same line typed again) andbun --hot(the file saved again). On 1.4.3-canary none does.--hotstill failed after 40 saves.NetworkTaskin the report. With the release at the three exits turned into a no-op, the same run reports 273 leakedNetworkTasks, 970 KB in total. That is the 401 requests minus the 128 inline pool slots.Queue::on_polldrains is recorded too: 5 resolves, 5 requests, 5onPackageManifestErrorlines. A microtask keeps the event loop turn busy while the response lands to get there. The "404 while the event loop is busy" test steers to that exit the same way. Its assertions hold on both exits.Suites run on the debug build:
test/cli/run/run-autoinstall*.test.ts,autoinstall-cached-manifest.test.ts,test/js/bun/resolve/resolve-autoinstall-*.test.ts,test/cli/install/bun-install.test.ts(13 tests need bitbucket.org, gitlab.com or the public internet, and fail the same on the release build),bun-add,bun-install-retry,bun-install-tarball-integrity,bun-install-streaming-extract.cargo clippy -p bun_install -p bun_jscis clean.Nested resolves. The wait runs the JS event loop, so a microtask can call
require()inside it. That nested resolve ends first. It used to drop the outer lookup's record, and the outer resolve then asked the registry twice (found in review, reproduced). The manager now counts the lookups that are inside the wait (root_lookups_waiting) and keeps the records while the count is above zero. During such a wait a failed name is not asked again. #36159 removes the nesting completely.Self-review.
unsafe fn. They are now separate:manifest_task_failedis safe, andrelease_network_taskonly releases. The two existing release guards use the same helper, sosrc/installhas fewerunsafeblocks than before for the same releases.BUN_CONFIG_HTTP_RETRY_COUNT=1and assert the exact request lists.The yarn and pnpm migration already clears
network_dedupe_mapfor the same reason (src/install/lockfile.rs: "would dedupe its own fetch of a manifest this pass failed to get").[human-review] gate passed · iteration 1 · 5 files touched
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