event loop: remove ManagedTask; each callback is its own task type - #43675
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…s gone ManagedTask was a heap box holding a context pointer and a function pointer, queued under one shared tag. Each of its 19 users now queues its own pointer under its own tag, and the dispatch arm calls the function directly. That removes one allocation, one free and one indirect call per task. Each type's Taskable impl now says how it is freed when its VM stops before the task runs. The boxed payloads are dropped, and the fetch request-drain hop and the HTMLRewriter background pull give back their ref. Before, all of these leaked.
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Actionable comments posted: 3
- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
In `@src/bundler/ParseTask.rs`:
- Around line 144-148: Update release_unrun to extract the result, invoke its
external cleanup callback via ExternalFreeFunction::call, then drop the result;
preserve the existing unsafe heap::take behavior and cleanup ordering.
In `@src/runtime/dispatch.rs`:
- Around line 396-415: In the four ServerDeinitTask dispatch
arms—HTTPServerDeinit, HTTPSServerDeinit, DebugHTTPServerDeinit, and
DebugHTTPSServerDeinit—place a safety comment immediately before each
corresponding unsafe block, describing the queued unique owning server pointer;
do not rely on a shared comment before the match arms.
In `@src/runtime/test_runner/bun_test.rs`:
- Around line 1515-1516: Update the Clippy allow attribute on RunTestsTask::call
to also suppress clippy::needless_pass_by_value, while preserving the existing
boxed_local allowance and reason.
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📒 Files selected for processing (24)
src/bundler/ParseTask.rssrc/bundler/ServerComponentParseTask.rssrc/bundler/bundle_v2.rssrc/event_loop/ConcurrentTask.rssrc/event_loop/ManagedTask.rssrc/event_loop/lib.rssrc/jsc/VirtualMachine.rssrc/jsc/event_loop.rssrc/jsc/lib.rssrc/jsc/virtual_machine_exports.rssrc/runtime/api/JSBundler.rssrc/runtime/api/html_rewriter.rssrc/runtime/dispatch.rssrc/runtime/dns_jsc/cares_jsc.rssrc/runtime/server/mod.rssrc/runtime/test_runner/bun_test.rssrc/runtime/valkey_jsc/valkey.rssrc/runtime/webcore/blob/copy_file.rssrc/runtime/webcore/blob/write_file.rssrc/runtime/webcore/fetch.rssrc/runtime/webcore/fetch/FetchTasklet.rssrc/runtime/webview/ChromeProcess.rstest/js/bun/http/bun-serve-html-405.test.tstest/js/node/watch/fs.watchFile.test.ts
💤 Files with no reviewable changes (3)
- src/event_loop/lib.rs
- src/jsc/event_loop.rs
- src/event_loop/ManagedTask.rs
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Beyond the inline findings, I also checked the GraphContextStopAgain pointer-packing path (Taskable::context never dereferences the packed ContextId, and the run arm decodes it with ContextId::from_raw) and the dispatch.rs table (all 82 tags have both a run arm and a release_unrun arm, with the Windows-only tags cfg-gated to unreachable! elsewhere) — neither is affected.
Extended reasoning...
This is a large event-loop refactor (24 files, ~676 insertions) that replaces a generic heap-boxed callback task with ~20 dedicated Taskable types, each defining its own teardown (release_unrun) semantics. Two verified findings are being posted inline (the server deinit no-op release path and the untested teardown leak fixes), and further verified findings were dropped from posting, so approval is not appropriate. The body records two concrete things examined and ruled out beyond the inline comments: the ContextId-in-pointer packing for GraphContextStopAgain (safe because Task::init only calls T::context, which ignores the pointer, and the run arm decodes it back via ContextId::from_raw rather than dereferencing), and the dispatch table completeness (the COUNT == 82 const assert forces every tag through both the run and release matches, with Windows-only arms gated by #[cfg(windows)] / unreachable!). Given the refcount and ownership sensitivity of every release_unrun body, a human maintainer should still audit each site against the old ManagedTask::new / new_owned behaviour.
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Updated 6:18 AM PT - Sep 21st, 2026
✅ @dylan-conway, your commit 305fb677b385d54780256656fd871b5b9895aca2 passed in 🧪 To try this PR locally: bunx bun-pr 43675That installs a local version of the PR into your bun-43675 --bun |
- dispatch: each server-deinit arm carries its own SAFETY comment, and the boxed test-runner and Chrome tasks take `self: Box<Self>` (clippy). - A parse result released unrun calls its native plugin's free function, which the bundle's finalizers would have called. - The server-deinit task's release comment said `finalize()` frees the server later. It does not: the task is only queued after the wrapper is finalized. - Test: a worker that exits with an unobserved HTMLRewriter transform's pull still queued frees the pipe.
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Beyond the inline nit on the new worker leak test, this pass also looked at the ContextId-in-pointer GraphContextStopAgain task (src/jsc/VirtualMachine.rs:1300, src/runtime/dispatch.rs:362): the run arm decodes it with ContextId::from_raw and the unrun arm never dereferences it, so packing an integer through Task::init is odd-looking but not unsound. The review-fix commit's parse_task::Result::release_unrun now calling the native plugin free function and the corrected ServerDeinitTask comment were read as well. Given this rewires every queued-callback site in the event loop (25 files, new release_unrun bodies whose balance depends on each enqueue site), a maintainer look at the per-site ref/protect accounting is still worthwhile.
Extended reasoning...
Findings are present (one posted nit on the new test plus further verified findings not posted), and the change is a large, memory-safety-sensitive refactor of the event loop's task dispatch touching 25 files, so approval is out. The new commit since the prior review adds the HTMLRewriter worker-exit leak test and corrects the server-deinit comment, which partially responds to earlier feedback; the packed-ContextId task and the parse-result free-on-unrun path were examined this run and ruled out as bugs, which is the only new information worth recording.
Findings marked 🟡 are optional suggestions and need no follow-up push.
A worker that threw or failed to load leaked nothing, so the run exited 0 with a small RSS delta and the test passed without exercising the release path. The worker's error event now rejects.
Conflicts: main narrowed three items this branch also touched to pub(crate) (the JSBundler and fetch re-exports, RunTestsTask::call). Kept main's visibility with this branch's additions. The five new task wrapper types in bun_runtime are pub(crate) too, for main's unreachable_pub lint.
Eight workers holding 28 MiB each instead of twenty holding 7 MiB: about 1.7 s on a debug build, ~145 MiB of growth without the fix. The per-test timeout is gone.
alii
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…kes mordant checks pass (#43688) ## What cleanup and get mordant checks green: Removing unnecessary `bun_paths::string_paths::starts_with_windows_drive_letter` and point its one caller at the generic `starts_with_windows_drive_letter_t` it wrapped. ## Why Since #43650 merged, the `mordant` job fails on every PR that runs it, with a single finding over the baseline: ``` warning: function `bun_paths::string_paths::starts_with_windows_drive_letter` is public, but nothing in the workspace uses it warning: mordant: 1 finding(s) over the baseline in bun_paths ``` Currently red for this reason: #43650 (merged), #43675, #43679, #43624. Every other open Rust PR will hit it on its next rebase. The wrapper's only caller is `src/install/dependency.rs:1458`, inside a `#[cfg(windows)]` block. The mordant job runs on `ubuntu-latest`, so from its view the function has no users and `unused_pub` is correct. #43650 turned `bun_runtime` into an ordinary library with `pub(crate)` modules, which is what let mordant see this crate's items for the first time; the finding was latent before that. ## The fix The wrapper's whole body was `starts_with_windows_drive_letter_t(s)` with `s: &[u8]`. The same file already calls the generic function directly on Windows at line 1067 with a `&[u8]`, and `bun_paths::strings` already re-exports it explicitly. The call site now does the same and the wrapper is deleted. No behaviour change: same `T = u8` instantiation, both functions were `#[inline(always)]`, and the name resolves through the same re-export the existing caller uses. ## Verification Not compiled locally: my machine has no vendored deps checkout and no clang 23, so neither `bun bd` nor `bun run rust:check-all` can run. The evidence is the pre-existing `_t` call with an identical argument type in the same file; CI's Windows build and the mordant job are the real check. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-authored-by: Claude Fable 5.1 <noreply@anthropic.com>
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Jarred-Sumner
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…fter fail, 204 abort) (#41688) ### Problem - A `S3File.writer()` dropped without `end()` leaks every byte written, leaves its multipart upload open, and keeps the event loop alive forever. - `NetworkSink::finalize` (`src/runtime/webcore/streams.rs:2343`) only drops the sink's ref. The `MultiPartUpload` keeps its owner ref, buffers and `KeepAlive` until `fail()` or `done()`, which nothing can call. - Also: a `fail()` during an in-flight CreateMultipartUpload left that upload open (`multipart.rs:704`). A 204 abort response counted as a failure, so each abort went out `retry` + 1 times (`simple_request.rs:367`). ### Fix - Commit 1: a Create response on a finished upload sends AbortMultipartUpload for the returned id. - Commit 2: the `writer()` finalizer queues a task (tag `S3UploadWriterCollected`) that calls `fail`: buffers freed, abort sent, `KeepAlive` released. - Commit 3: the rollback completes through the `Delete` callback kind. 200, 204 and 404 are final. - Verified: `test/js/bun/s3/s3-upload-abort.test.ts` (6 cases, each fails without its change). ### Background - `MultiPartUpload` is the native object behind one S3 upload. Its refs: the sink, each part in flight, and an owner ref that the final commit or rollback releases. - A finalizer runs inside a GC sweep, where no promise can be settled. So `fail` runs from an event-loop task. ### Downsides - A `flush()` promise pending when its writer is collected now rejects with `S3 writer was garbage collected before end() was called`. Before, it resolved and the process then hung. - Still open: `fail()` sends the abort while part uploads are in flight, and no second one (checked in the code). AWS documents that such a part can outlive the abort. Not verified here. Not tracked. <details><summary>Notes</summary> Rebased onto main. The first version queued a `ManagedTask`, which #43675 removed. The task is now `multipart::WriterCollected`, a `#[repr(transparent)]` wrapper over the upload with its own `Taskable` impl, a `run_task` arm, a `release_task_unrun` arm, and `task_tag::COUNT` 82 to 83. It carries one ref. Its context is the context of the script that made the writer. When that context stops, the upload's `abort_handle` fails it, so `release_unrun` only drops the task's ref. `writer_holders` on `NetworkSink` is 0 when a streaming upload (`S3UploadStreamWrapper`) owns the sink, so the finalizer hook acts only on the `writer()` path. A writer that called `end()` is not touched. The pending-`flush()` rejection only reaches code that can no longer call `end()`: a writer that a suspended async function still refers to is not collected. Commit 3 came from review. Against real S3 every AbortMultipartUpload (the two new callers here, and the existing stream-error rollback) was answered with 204, counted as failed, and sent again 3 more times by default. The later ones got 404 NoSuchUpload, also counted as failures. Isolated check on the debug build with `retry: 3` and a stub that answers 204: 4 aborts without commit 3, 1 with it. Repro from the report (80 dropped writers, 2 parts each, loopback stub): on 1.4.3 the stub sees 80 Create and 160 UploadPart, 0 Complete, 0 Abort, and the process never exits. On this branch (debug build with ASAN) the stub sees 80 Create and 80 Abort, and the process exits on its own in 4.6 s. No ASAN report. RSS was not measured on a release build. A writer with only 1000 buffered bytes pins the loop on 1.4.3 too, and exits here. `Bun.file(path).writer()` dropped the same way closes its fd and exits on both. The test cases: stream error while Create is in flight (no GC), a 204 abort with `retry: 3` (no GC), a dropped writer with parts already uploaded (Abort sent at once), a dropped writer collected while Create is in flight (Abort sent when the response lands), and a dropped writer with only buffered bytes (no request was ever sent, the process just exits). The uploaded-parts writer case keeps its writer reachable until both parts are uploaded, then drops it: a forced GC before that point aborted the upload early (0 parts, 1 abort), so an automatic one could have failed the case. The Create-in-flight writer case holds the Create response until the writer's pending `flush()` rejects. That is the one signal script gets that `fail()` ran, so the part count does not depend on GC or task order. Probes on this branch: 20 dropped writers then `process.exit(0)` in the same tick, a Worker that exits with 20 dropped writers (20 `fail AbortError` from the context stop, 20 frees), and `close()` without `end()` (it completes the upload, same as 1.4.3). All exit clean under ASAN. Suites run on the final build: `s3-upload-abort` (10 runs, 5 of 5 each), `s3-upload-stream-gc`, `s3-stream-error-gc`, `s3-stream-cancel-leak`, `s3-connection-close`, `s3-queueSize-validation`, `s3-storage-class`, `s3-requester-pays`: 38 pass, 0 fail. `s3.leak` skips without S3 credentials. `cargo clippy -p bun_runtime -p bun_event_loop` reports nothing in the touched files. No per-write cost: the finalizer hook runs once per collected writer, nothing per chunk. From review, after the first version: the collected-writer rejection had no `path`, unlike every other error of this writer. A probe showed it: a 403 on the same writer gave `path: "control-key"`, the new rejection gave none. The finalizer drops the sink's ref before the queued task runs, so `sink.path()` was `None`. The completion callback now takes the path from the upload, as it already did for `uploaded_bytes`, and the unused `NetworkSink::path` is removed. The gated writer case asserts `(path key)`. With the change reverted it fails with `(path undefined)`. The 204 case now also runs with a stub that answers 404. With `NotFound` routed to the failure arm the stub sees 4 aborts and that case fails. With the clause it sees 1. CI on f9087f1 (build 119830): 180 of 181 jobs passed and `s3-upload-abort.test.ts` passed on every lane. One red test: `test/js/bun/spawn/spawn.test.ts` ("an idle reader stopped at the highwater mark") on debian 13 x64-asan. What is known: it passed 3 of 3 runs on a local ASAN build of this branch, it is not listed in the last 8 finished builds of main, and its assertion text is not in the CI output that could be read. No link to this diff was found, and it is reported for triage. `s3.test.ts` timed out once on darwin in a large upload to R2 and passed on retry. That upload uses the streaming path, which the finalizer hook skips, and the same suite also flaked in two recent builds of main. About the open item under Downsides, and how commit 3 touches it: on main the rollback read the 204 as a failure and re-sent the abort while `retry > 0` (4 aborts by default, measured with the stub). AWS's advice for a part that is in flight during an abort is to repeat the abort. So main repeated it by accident on the stream-error and part-failure paths, and commit 3 stops that. Whether those repeats ever helped is not known: the later ones were answered 404, they were not timed to the parts, and what S3 keeps cannot be tested here. For a collected writer main sent no abort at all, so there this PR can only reduce what stays on the server. Test placement: the repo rule is to add tests to the module's existing file, and these cases are in a new file, `s3-upload-abort.test.ts`. An earlier version of this note said `s3.test.ts` only runs with real S3 credentials. That was wrong. Its blocks "s3 multipart upload id validation" and "s3 upload stream body error" are not gated, use a local `Bun.serve` stub, and spawn a child with `bunExe() -e`, the same shape as these cases. So these cases could live there. A sibling file is also an existing pattern in this directory (`s3-upload-stream-gc.test.ts` was added after those blocks), which is why the new file was not flagged in review. I did not move them, because that means one more push and CI run for a location change. I will move them into `s3.test.ts` if a maintainer prefers that. Related open PRs: #39692 covers the VM-teardown half of the same leak and rewrites `fail`. This PR changes the "a request still out drops its ref on Finished" rule for the Create response only. #34999 is an older take on freeing the sink box that `writer_holders` replaced. </details> <!-- robobun:evidence:begin --> --- **[human-review]** gate passed · iteration 0 · 6 files touched <details><summary>fails on main (without fix)</summary> ```console ASAN without fix: 6 FAILED $ BUN_DEBUG_QUIET_LOGS=1 bun scripts/build.ts --profile=debug --quiet test "--reporter=junit" "--reporter-outfile=/tmp/pr_gate.xml" "test/js/bun/s3/s3-upload-abort.test.ts" bun test v1.4.3 (367d939) test/js/bun/s3/s3-upload-abort.test.ts: 138 | // S3 answers AbortMultipartUpload with 204. A 404 means the store no longer has the upload. 139 | // Both are final: the abort must not be sent again. 140 | test.concurrent.each([204, 404])("AbortMultipartUpload answered with %d is not retried", async abortStatus => { 141 | expect( 142 | await run({ body: failingStream(`reqs.part === 1`), waitFor: `reqs.abort > 0`, retry: 3, abortStatus }), 143 | ).toEqual({ ^ error: expect(received).toEqual(expected) { "exited": 0, "stderr": "", "stdout": "rejected: source failed - {"create":1,"part":1,"complete":0,"abort":1,"put":0} + {"create":1,"part":1,"complete":0,"abort":4,"put":0} " , } - Expected - 1 + Received + 1 at <anonymous> (/workspace/bun/test/js/bun/s3/s3-upload-abort.test.ts:143:5) (fail) AbortMultipartUpload answered with 204 is not retried [410.92ms] 138 | // S3 answers AbortMultipartUpload with 204. A 404 means the s ... (truncated) release without fix: all passed bun test v1.4.3-canary.1 (f280f55) test/js/bun/s3/s3-upload-abort.test.ts: (pass) stream error while CreateMultipartUpload is in flight aborts the upload [21.17ms] (pass) dropped writer with only buffered bytes lets the process exit [18.01ms] (pass) AbortMultipartUpload answered with 204 is not retried [40.27ms] (pass) AbortMultipartUpload answered with 404 is not retried [41.07ms] (pass) dropped writer collected while CreateMultipartUpload is in flight still aborts it [44.70ms] (pass) dropped writer with uploaded parts aborts the multipart upload and lets the process exit [52.69ms] 6 pass 0 fail 6 expect() calls Ran 6 tests across 1 file. [120.00ms] __F:0:S:0 ``` </details> <details><summary>passes on PR (with fix)</summary> ```console ASAN with fix: all passed $ BUN_DEBUG_QUIET_LOGS=1 bun scripts/build.ts --profile=debug --quiet test "--reporter=junit" "--reporter-outfile=/tmp/pr_gate.xml" "test/js/bun/s3/s3-upload-abort.test.ts" bun test v1.4.3 (367d939) test/js/bun/s3/s3-upload-abort.test.ts: (pass) stream error while CreateMultipartUpload is in flight aborts the upload [359.34ms] (pass) AbortMultipartUpload answered with 404 is not retried [345.85ms] (pass) AbortMultipartUpload answered with 204 is not retried [362.73ms] (pass) dropped writer collected while CreateMultipartUpload is in flight still aborts it [386.84ms] (pass) dropped writer with uploaded parts aborts the multipart upload and lets the process exit [409.72ms] (pass) dropped writer with only buffered bytes lets the process exit [306.80ms] 6 pass 0 fail 6 expect() calls Ran 6 tests across 1 file. [2.48s] __F:0:S:0 release with fix: all passed $ bun scripts/build.ts --profile=release [configured] bun-profile → bun (stripped) in 739ms (unchanged) ninja: Entering directory `/workspace/bun/build/release' [1/29] gen generated_host_exports.rs generated_host_exports.rs: 121 exports (host=5, lazy=10, generic=106, rust=0); 245 extern-C blocks audited [2/28] rustc bun_event_loop [3/28] rustc bun_spawn [4/28] rustc bun_patch [5/28] rustc bun_http [6/28] rustc bun_bundler [7/28] rustc bun_transpiler [8/28] rustc bun_standalone_graph [9/28] rustc bun_bunfig [10/28] rustc bun_install [11/28] rustc bun_jsc [12/28] rustc bun_sys_jsc [13/28] rustc bun_ast_jsc [14/28] rustc bun_bundler_jsc [15/28] rustc bun_patch_jsc [16/28] rustc bun_semver_jsc [17/28] rustc bun_css_jsc [18/28] rustc bun_js_parser_jsc [19/28] rustc bun_sourcemap_jsc [20/28] rustc bun_install_jsc [21/28] rustc bun_http_jsc [22/28] rustc bun_sql_jsc [23/28] rustc bun_runtime [24/28] link bun-profile ld.lld: warning: Linking two modules of different target triples: 'obj/unified/UnifiedSource-src_jsc_bindings-0.cpp.o' is 'x86_64-pc-linux-gnu' whereas '../../../../root/.bun/build-cache/webkit-564ac2a6cad8da6a-lto/lib/libJavaScriptCore. ... (truncated) ``` </details> <details><summary>diff hotspot</summary> ``` src/event_loop/ConcurrentTask.rs | 1 + src/runtime/dispatch.rs | 7 +- src/runtime/webcore/s3/client.rs | 9 +- src/runtime/webcore/s3/multipart.rs | 84 +++++++++++-- src/runtime/webcore/streams.rs | 20 +-- test/js/bun/s3/s3-upload-abort.test.ts | 222 +++++++++++++++++++++++++++++++++ 6 files changed, 319 insertions(+), 24 deletions(-) ``` </details> **gate history** · 5 passed · 0 rejected · iteration 0 <details><summary>evidence per changed file</summary> ``` file reads edits tests src/event_loop/ConcurrentTask.rs 1 1 44 src/runtime/dispatch.rs 1 1 43 src/runtime/webcore/s3/client.rs 3 1 44 src/runtime/webcore/s3/multipart.rs 5 10 44 src/runtime/webcore/streams.rs 4 6 44 test/js/bun/s3/s3-upload-abort.test.ts 7 6 43 ``` </details> <!-- robobun:evidence:end -->
robobun
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Sep 27, 2026
…PN slot on index 0 Three places where the merge of main left the socket code different from main for no gain. - `DuplexUpgradeContext` was the one task type with no `impl Taskable`. `enqueue_self_task` built its `Task` with a bare `Task::new`, and `__bun_release_task_unrun` had a hand-written arm for it. The impl is back beside the type, the task is made with `Task::init`, and the arm is `release!` again, as for every other tag (#43675). - The `AbortHandleOwner` impl of `DuplexUpgradeContext` and the call of `AbortHandle::arm_owner` are back in `socket_body.rs`. They were in `Listener.rs` only so that this file had no `unsafe`. The same holds for the export `Bun__socketReadErrorFromCloseCode`, which is beside `read_error_from_close_code` again. - `ExDataSlot` registered an ex_data index of its own. That was the third index on each `SSL` of uSockets, and the first write to it made BoringSSL reallocate the ex_data stack: one malloc and one free for each accepted TLS connection on a server with ALPN. The slot is now index 0, the application slot, which main uses for the same pointer. The constructor is `unsafe`, because an `SSL` has only one such slot. `socket_body.rs` has 8 lines with `unsafe` now (main: 52).
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What does this PR do?
Removes
ManagedTask, the event loop's generic callback task, and gives each of its 19 users its own task type. A task now costs one allocation, one free and one indirect call less than before.ManagedTaskwas a heap box holding a context pointer, a function pointer and an optional cleanup function, queued under one shared tag. ATaskis 16 bytes (tag, context id, pointer), so it has no room for a function pointer. The tag has to say what to run, which is how every other task already works.FetchTasklet,RewriterPipe, pluginLoad/Resolve, the VM) queue that pointer under a#[repr(transparent)]wrapper with its own tag. No allocation.ContextIdinto the pointer instead.NewServer<SSL, DEBUG>andNewApp<SSL>pick their tag from the const generics.ConcurrentTask::from_callbackand theManagedTaskcase inrelease_refusedare deleted.Behaviour change: each
Taskableimpl now decides what happens when the VM stops before the task runs. Boxed payloads are dropped, and the fetch request-drain hop and the HTMLRewriter background pull give back their ref andprotect(). These leaked before. Server deinit, the Windows mkdirp hops, the bundler plugin hops and the graph-context tasks stay no-ops there. Every new task keepsContextId::NONE.How did you verify your code works?
Debug build on Linux;
cargo checkforx86_64-pc-windows-msvc. On the debug build:bun-serve-html-405.test.ts(includes the LSan server-teardown test),html-rewriter-leak.test.tsandtest/bake/dev/plugins.test.tspass, and a cancelleddns.promises.Resolverquery rejects withECANCELLED.Not run: the three Windows-only tasks (type-checked only) and the valkey failure task.