Release the poll and surface the error when a Bun.file() stream read fails - #41420
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…) stream read fails FileReader::on_reader_error delivered the error only through the pending pull. With no pull pending (a synchronous read inside on_pull, or an error between pulls) the error was dropped and the next pull waited forever. Store it in a read_error slot and return it from the next on_pull, after any buffered bytes. The reader also kept its poll registered and its fd open after the error. An errored stream is never cancelled, so the registered poll kept the event loop alive. Close the reader right after the error is delivered.
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ChangesFileReader read-error handling
Suggested reviewers: Merge Risk: ⚪ Minimal · up to This change preserves file-stream read errors, releases errored reader resources, and delivers deferred errors to stream consumers and sinks. No current merge-blocking risk remains. 🚥 Pre-merge checks | ✅ 4✅ Passed checks (4 passed)
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Inline comments:
In `@src/runtime/webcore/FileReader.rs`:
- Around line 965-969: Update the cleanup branch around
waiting_for_on_reader_done to decrement the parent reference whenever that flag
is set, removing the redundant !self.done.get() guard. Add a debug assertion
that done and waiting_for_on_reader_done are not simultaneously true, then
preserve the existing flag reset and Source::decrement_count behavior.
In `@test/js/web/streams/streams.test.js`:
- Line 2053: Remove the exact stderr assertion near the streams test, ensure the
stderr stream is still drained so the child process cannot block, and validate
the test only through the existing stdout and exitCode checks.
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src/runtime/webcore/FileReader.rstest/js/web/streams/streams.test.js
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Beyond the inline finding, I traced the refcount balance through the refactored on_reader_error: the pin increment_count now taken before all three branches is matched by the tail decrement_count on every path, and the waiting_for_on_reader_done decrement in between is the same across-read ref the old code released — net delta is unchanged for the sink, pending-pull, and new stored-error branches. close_after_error() runs while the pin still holds count ≥ 1, so self is live there.
Extended reasoning...
The confirmed inline finding covers the start_for_sink interaction with the new done = true in close_after_error. Separately I checked whether hoisting the increment_count pin above the sink branch changes the net refcount on any path — it does not: the old sink branch had no pin and at most one decrement (the across-read ref); the new sink branch adds one pin increment and one matching tail decrement around the same conditional across-read decrement, so the net is identical. The pending-pull and stored-error branches likewise match the old non-sink path's net. close_after_error() is called between the across-read decrement and the pin release, so the pin guarantees self is still alive when reader().deinit() runs.
Additional findings (outside the current diff — GitHub can't attach inline comments there):
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🔴
src/runtime/webcore/FileReader.rs— A read error stored during native sink hookup is dropped and the sink ends cleanly.close_after_error()now setsdone = truewhenon_reader_errorfires with no sink; when that happens insidestart_for_sink()(poll registration fails inreader().start(), or the initialread()for a from_pipe reader errors), the hookup then attaches the sink andpull_into_sink()seesdoneand callssink.end(None)here — a fetch/HTMLRewriter body reads as empty where the base branch's retryread()deliveredsink.end(err). Fix: passself.read_error.replace(None).map(streams::StreamError::Error)to thissink.end(...)so a stored read error reaches the sink.Extended reasoning...
Bun.file(pollable_fd).stream()(or aBun.spawnstdout stream) is wired natively — fetch body, HTMLRewriter input,Bun.write— viawire_to_native_sink(ReadableStream.rs:366-389). Line 367 reads!file_reader.done.get()as true, thenstart_for_sink()runson_start(). For a pollable fdreader().start(fd, true)callsregister_poll()(PipeReader.rs:561); on epoll_ctl/kevent failure (ENOSPC max_user_watches, ENOMEM) it dispatcheson_reader_error. With no sink and no pending pull the new third branch stores the error inread_error, andclose_after_error()(FileReader.rs:983-985) setsdone = trueand deinits the reader.start()still returns Ok,on_start()returnsReady,start_for_sink()returnsNone, and ReadableStream.rs:383-388 setsfile_reader.sink,sink_paused = true, and callspull_into_sink(). Therereader_done || self.done.get()is true →sink.end(None)at line 575; the storedread_erroris never read (onlyon_pullconsults it). On the base branchon_reader_errorneither setdonenor closed the reader, sopull_into_sink()fell…Verification: normal — the change adds a path where a read error is silently dropped and a native sink ends cleanly, where base surfaced it. Trigger:
wire_to_native_sink(ReadableStream.rs:366-389) checks!file_reader.done.get()once at :367, then callsstart_for_sink()→on_start(). Insideon_start()two calls can synchronously dispatchon_reader_errorbefore any sink is attached: -… | normal —…
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Good catch on the sink hookup. A read error that lands during start_for_sink (poll registration failure, or the initial read of a from_pipe reader) is stored with no sink attached, and pull_into_sink then saw done and ended the sink cleanly. 3901fcb passes the stored error to sink.end there, and buffered bytes go out as Owned (not OwnedAndDone) so the error follows them. I could not trigger that path from a test (it needs epoll_ctl to fail), so it is covered by reading, not by a test. |
Jarred-Sumner
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Use RAII. Don't use manual ref / deref
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Done in 7187863. A SourcePin guard takes the ref in new() and releases it in Drop. on_reader_error, on_reader_done and on_read_chunk use it instead of the increment_count / decrement_count pairs. The across-read ref (waiting_for_on_reader_done) stays a stored flag because its lifetime spans from start to the reader's completion, not a scope. |
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Note: #41456 makes the same change to FileReader::on_reader_error (a stored read_error, deinit on error) as part of a fix for subprocess stdio errors. Whichever PR lands second rebases that one function. |
…hem (#41456) ### Problem - A `recv()` or `send()` on a subprocess stdio socket that fails with an errno other than `EAGAIN`/`EINTR` (`ENOBUFS`, `ENOMEM`, `EIO`, `ECONNRESET`) is lost in four places. `Bun.spawn({stdin: ReadableStream})` truncates the child's input and never calls the stream's `cancel()`. `child.stdout` from `node:child_process` emits `'close'` with no `'error'`. `Bun.spawn` rejects the read with `EIO` but keeps the stdout fd open, so a still-writing child blocks and `proc.exited` never settles. `Bun.spawnSync` returns `{stdout: undefined, success: true}`. - The common cause is `FileReader::on_reader_error` (`src/runtime/webcore/FileReader.rs`): it only rejects a parked read. With none parked it drops the error, leaves the fd and the poll in place, and the next pull reads on. #41420 (merged) fixes that function for `Bun.file().stream()`. The buffered `SubprocessPipeReader` turns an error into `Readable::Ignore` (`subprocess.rs:on_close_io`), `native-readable.ts` `_destroy` calls its callback without the error, and `FileSink::on_close` hands the piped stream `undefined` as its cancel reason. ### Fix - On top of #41420's `read_error` slot, now on main: `on_pull` returns a stored error before it consults the reader state, so a reader that never started can end with one. - `Readable::Errored(bytes, err)` keeps a buffered pipe's partial output and error, and the reader releases its fd at once, the way EOF does, so the child gets `EPIPE`. `.stdout` becomes a stream that delivers the bytes and then errors (`ReadableStream::from_bytes_then_error`). `Bun.spawnSync` throws the error, so `child_process.spawnSync` reports `result.error` and `execFileSync` throws. - `native-readable.ts` passes the error to the `_destroy` callback, so the node `Readable` emits `'error'` before `'close'`. `FileSink::on_close` passes the recorded write error to the source, and the pump's abrupt path (`rsisAbrupt`) cancels the stream with it even though its own orphaned reader holds the lock. - Verified: `test/js/bun/spawn/spawn-stdio-syscall-error.test.ts` (12 tests, all fail on 1.4.1; an `LD_PRELOAD` shim fails the Nth `recv`/`send` on the stdio socketpair). Also `test/js/bun/spawn/`, `test/js/node/child_process/`, `test/js/node/stream/`, `test/js/web/streams/`, `test/js/bun/io/bun-write.test.js`, the shell fault tests. ### Background - `Bun.spawn` reads stdout into a `SubprocessPipeReader` until JS touches `.stdout`. Then the fd and its buffer move into a `FileReader`, the native source behind the JS `ReadableStream`. A JS pull first tries a synchronous read; with no data it registers a poll and parks a `Pending` promise. - The `BufferedReader` reports `on_read_chunk`, `on_reader_done` (EOF: it closes itself first) or `on_reader_error` (it did not close). - `node:child_process` wraps the native stream with `native-readable.ts`, a `Readable` whose `_read` calls the native `pull`. A sync throw from `pull` reaches `errorOrDestroy`, which calls `_destroy(err, cb)`. Node's contract is `cb(err)`. - A `ReadableStream` given as `stdin` is pumped into a `FileSink` by `readStreamIntoSink` (`BunStreamSource.cpp`). A sink write that fails synchronously throws into the pump (`rsisAbrupt`). A write that fails later closes the writer, which calls the pump's `onClose(reason)`. <details><summary>Notes</summary> The four faces come from a fault-injection fuzz round (internal ledger entries 20002 to 20005, not GitHub issues): strace injected errnos on the parent's stdio socketpairs. All four pre-date 1.4. Open question for review: `Bun.spawnSync` has no error channel other than a throw, so the partial output, the exit code and the pid are lost when a stdio read fails. Node's `spawnSync` returns `{error, status, pid, stdout: <partial>}`. A result field on `Bun.spawnSync` (next to `exitedDueToMaxBuffer`) would let `child_process.spawnSync` match Node. That is new API surface, so this PR keeps the throw. Follow-up candidates, kept out of this PR: the fd release on a read error belongs once in `PosixBufferedReader::on_error` (`src/io/PipeReader.rs`) for every parent, not per parent. The `native-readable.ts` `_destroy` fix also makes a user's `child.stdout.destroy(err)` emit `'error'` before `'close'`. The strace-based repros from the ledger reproduce with the test's shim (strace is not available in the build container). On 1.4.1: - stdin stream, `send` #3 fails with `ENOBUFS`: `cancelReason "not-called"`, the child reads 131072 of 8388608 bytes, exit code 0, nothing thrown. - child_process, `recv` #3 fails with `EIO`: events `["stdout.close", "exit:1:null"]`, 360448 of 8000000 bytes. - Bun.spawn `for await`, `recv` #3 fails: `rerr "EIO"`, then `exited` does not settle, the child sits in `do_wait`/`sock_alloc_send_pskb`. With `recv` #4 failing instead the error is swallowed and reading continues. - Bun.spawnSync: `{stdout: undefined, exitCode: 0, success: true}`; `cp.spawnSync` `{stdout: null, status: 0, error: undefined}`; `execFileSync` returns `null`. `rsisAbrupt` cleared `op->m_reader` and then tested `isReadableStreamLocked(stream)`. The orphaned reader still locks the stream, so that branch never ran and the source's `cancel()` was never called. The old JS pump had the same gap (`stream.cancel(e)` on a locked stream rejects). The shim interposes `syscall()` for `SYS_close` as well as `close()`: bun closes fds through the raw syscall, so a per-fd counter that only reset in `close()` carried over to a recycled fd number. Pre-existing on this machine with or without the change (debug ASAN build): `test/js/bun/spawn/spawn-pipe-leak.test.ts` exceeds its 30 s budget (450 ms per iteration), `test/js/web/streams/streams-leak.test.ts` "Absolute memory usage" sits at the 700 MB ASAN bound (692 to 713 MB across runs on both builds), and `child_process.test.ts` "spawn in the default shell" fails on the released bun too. </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/js/bun/spawn/spawn-stdio-syscall-error.test.ts <!-- robobun:evidence:end -->
### Problem - `test/js/bun/spawn/spawn-stdio-syscall-error.test.ts` is red on alpine: `"lost": -82000`, not `0` (build 120303). #43739 added the case, not the bug. - `read_loop` (`src/io/PipeReader.rs:766`) delivers the bytes read before a failed read, then the error. The consumer asks for more inside that delivery, and the reader reads the fd past the error. The error comes late, or never. ### Fix - `read_once` sets `PosixFlags::READ_FAILED` on a fatal error, and `begin_read` does not read while it is set. The request parks, then `on_reader_error` rejects it. Nothing clears the flag. - Correct: libuv `uv__read` clears `UV_HANDLE_READABLE` before it reports a read error. - Verified: `test/js/bun/spawn/spawn-stdio-syscall-error.test.ts`, 17 pass. The four new cases fail without the fix. Suites: Notes. - Self-reviewed: 15 concerns raised, 14 addressed. Not taken: a flag reset in `start()`, which nothing on main needs. ### Background - `PosixBufferedReader` reads the fd behind subprocess stdio, file streams and the shell. Its parent gets `on_read_chunk`, then `on_reader_done` or `on_reader_error`. - `FileReader` is the parent behind a `ReadableStream`. `on_read_chunk` resolves the parked `pull()`, and the reaction runs before it returns. - Considered: a repeating shim failure hides the lost error. An error stored in `FileReader` first needs a callback in every parent. - #43920 is a newer PR with the same change. Its test trigger is here. ### Downsides - After a read error, a stream that ended with `'end'` now ends with `'error'`, as in Node. With no listener the process stops. - After a read error, `bun run --filter` no longer drains that pipe at exit. - Reads that do not fail pay nothing: `begin_read` tests one more bit. <details><summary>Notes</summary> **Trace without the fix** (bun 1.4.3-canary.1+367d939d9, shim logs each `recv()`, writer `dd bs=1025`). The debug build of main at 8d36bff does the same: 3 of 8 runs, two with no `'error'` and `lost` -7714150: ``` recv #5 len=262144 -> 95325 recv #6 len=166819 -> EIO (injected) same fill_scratch call as #5 JS data 95325 recv #7 len=65536 -> 65536 pull from inside the delivery, read_into recv #8 .. #116 to EOF {"received":452025,"got":8000125,"lost":-7548100,"events":["stdout.close","close"]} ``` No `'error'` event: the reads reached EOF before `on_reader_error` ran, and a stored error is only returned by a later pull. When the reads park first, `on_reader_error` rejects that pull and `'error'` comes late. That is the CI signature: the events match and `lost` is a negative multiple of 1025. **Why alpine.** In CI the failure is injected: the shim fails only the Nth `recv()`, so a later `recv()` succeeds and the extra bytes show. The failing `recv()` must follow bytes in the same wakeup. BusyBox `head` writes 1025 bytes at a time, so a wakeup often holds a short `recv()` and then the failing one. coreutils `head` fills the buffer in one `recv()`. The same run fails on debian when the writer is slow. With a writer that copies BusyBox `head` (stdio, 1024-byte buffer), the `RECV_AT=6` case fails 7 of 40 runs on bun 1.4.3-canary (release), and 36 of 40 when the writer also spins between chunks. This branch (debug): 0 of 120, and 0 of 60 with `dd bs=1025`. **With no shim.** A child with one AF_UNIX socket as fd 0 and fd 1 writes a line to stdout and reads stdin. The peer leaves that line unread, sends 8192 bytes and closes. The kernel gives the child 8192 bytes, then `ECONNRESET`, then EOF. | Runtime | stdin events | |---|---| | Node v26.3.0 | `'error'` `ECONNRESET` after 8192 bytes | | bun 1.4.3-canary.1+367d939d9 | `'end'` after 8192 bytes, no error | | this branch | `'error'` `ECONNRESET` after 8192 bytes | **The new cases.** Each one reaches the reader from inside the delivery in a different way. Whole-file runs of the describe block: | Case | Entry | Release, no fix | Debug, no fix | Debug, guard in `read_into` only | Debug, this branch | |---|---|---|---|---|---| | `child_process`, `'data'` listener | pull, `read_into` | fails 6 of 6 | fails 5 of 5 | passes | passes | | `child_process`, `'readable'` and `read()` | `set_flowing(true)`, `read` | fails 6 of 6 | fails 5 of 5 | fails 3 of 3 | passes | | `Bun.spawn`, `lazy` | pull, `read_into` | fails 6 of 6 | fails 5 of 5 | passes | passes | | `Bun.spawn`, reader started at spawn | pull, `read_into` | fails 6 of 6 | fails 5 of 5 | passes | passes | - The first three use counts: `SPAWN_FAULT_RECV_CAP=4096` makes every `recv()` short, so `fill_scratch` calls `recv()` again in the same wakeup. `SPAWN_FAULT_RECV_EAGAIN_AT=2` ends the first read loop, so the consumer's read parks and the next read is poll-driven. `SPAWN_FAULT_RECV_AT` then fails after bytes in that wakeup. For the `'readable'` case it is 19: #3 to #18 return 64 KiB, the highWaterMark, so the reader is stopped and `read()` starts it again. - The fourth uses state, and comes from #43920: the writer waits for a line on stdin, so the first read is parked when the bytes arrive. `SPAWN_FAULT_RECV_MID_FILL=1` fails the `recv()` that follows one that returned bytes, and `SPAWN_FAULT_READS_AFTER` counts the `recv()` calls after it. Without the fix it is 1. - With a count-based trigger and the reader started at spawn, the case passed without the fix on a debug build: the buffered reader that runs before JS reads `.stdout` took the bytes and the error. That is why this case uses state. - With the BusyBox-like writer at four speeds, the whole file passes 20 of 20 on this branch. **With the fix**, `CAP=4096 EAGAIN_AT=2 RECV_AT=5`: ``` recv #3 -> 4096, recv #4 -> 4096, recv #5 -> EIO JS data 8192 close(fd) JS error EIO ``` **Node.** libuv `uv__read` (`src/unix/stream.c`): on a read error other than `EAGAIN` it clears `UV_HANDLE_READABLE | UV_HANDLE_WRITABLE`, calls `read_cb` with the error, then stops the watcher. It calls `read_cb` once for each `read()`, so it never holds bytes and an error from one batch. **Placement.** EOF and the `maxBuffer` stop have the same guard at this site: `close_if_final` closes the reader before the final chunk is delivered. An error cannot use it, because a closed reader with no stored error reads as a clean end. For the same reason `READ_FAILED` is not part of `is_done()`. **Parents** (14 `BufferedReaderParent` implementations, what each does in `on_reader_error`): - 3 release the fd: `FileReader`, `SubprocessPipeReader`, `Terminal`. - 2 drop the reader: `FileResponseStream`, shell `subproc.rs`. - 8 only do accounting: `filter_run.rs`, `multi_run.rs`, `lifecycle_script_runner.rs`, `security_scanner.rs`, `git_runner.rs`, both cron jobs, test `Worker.rs`. `lifecycle_script_runner.rs` and `cron.rs` build a new reader with `init()` for each spawn. - 1 is shared and can restart: the shell `IOReader`. Only two read the same reader after an error. `filter_run.rs` `drain_and_close_pipes` reads once more at exit. That read is now a no-op, and `deinit()` follows. Before, it could reach a second terminal callback and decrement `remaining_fds` twice. The shell `IOReader::start()` does not restart a reader after a failed read on main, because the fired one-shot poll still counts as registered. The Windows reader gets one libuv callback for each read, so it has no bytes-then-error batch. **Left open.** - The flag is permanent. #39638 and #37901 change `IOReader::start()` to restart the shell's stdin reader. After this PR they must clear `READ_FAILED` there, or a `cat` that follows a stdin read error gets no data, no EOF and no error. - Not in this PR: a batch that stops because the buffer is full is labelled `ReadState::Eof` when the poll event carries the hangup (`read_state`, `None if received_hup`). `Bun.write(file, proc.stdout)` then writes 262144 of 400000 pending bytes and resolves. It is on main and in 1.4.3-canary, and this PR does not change it. It needs its own change. - Not in this PR: release the fd on a read error once, in `PosixBufferedReader::on_error`. #41456 names it as a follow-up. #41420, #41456 and #42150 did it for one parent each. **Suites run on the debug build:** `test/js/web/streams/streams.test.js` (624 pass), `test/js/node/stream/node-stream.test.js` (112 pass), `test/js/bun/spawn/spawn-streaming-stdout.test.ts` (pass), `test/js/node/child_process/child_process.test.ts` (81 pass, 2 fail in my container for reasons outside this change: "spawn in the default shell" reads an empty `$SHELL`, and "extra stdio pipes are not double-closed on GC" needs 5.0 s in a debug build against the 5 s timeout, its script prints `OK`). With this branch's build, the test file of #43920 passes 17 of 17 in 3 runs. #43790 is open and edits the comment above the failing case. It changes the event order in `native-readable.ts`, not the reader. </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/js/bun/spawn/spawn-stdio-syscall-error.test.ts <!-- robobun:evidence:end -->
2 participants
Problem
Bun.file().stream()whoseread(2)fails with no pull pending never settles.for await (const c of Bun.file("/proc/self/mem").stream())hangs forever, whileBun.file(path).text()rejects withEIO(Error the Bun.file() stream when read() fails instead of hanging the pull promise #33362).reader.read()rejects withEIO: i/o error, read, but theFilePollstays registered and the dup'd fd open. An errored stream is never cancelled, so nothing releases them.FileReader::on_reader_error(src/runtime/webcore/FileReader.rs). It only runspending, a no-op unless a pull is pending (Pending::run), and it never closes the reader.Fix
on_reader_errorsettles the pending pull when there is one. Otherwise it stores the error in a newread_errorslot, and the nexton_pullreturns it after any buffered bytes (reader_finished,end_of_reader).on_reader_errorthen closes the reader (close_after_error): it marks the source done and releases the poll and the fd throughdeinit, which reports no second completion.test/js/web/streams/streams.test.js(6 new tests, 5 fail on 1.4.1). Also the rest oftest/js/web/streams/, the fs, stream and spawn suites.Background
FileReaderis the native source behindBun.file().stream(). A pull first tries a synchronous read (read_into). With no data on a pollable fd, theBufferedReaderregisters a poll and the pull becomes pending. A registered poll keeps the event loop alive.on_read_chunk,on_reader_doneoron_reader_error. On EOF it closes itself before it reports. On error it did not.sinkis the native consumer path (a fetch body). It gets the error throughsink.endand needs the same reader close.Notes
This supersedes #33362, which stores the error in a
read_errorslot in the same way but does not release the poll and the fd. Its tests are carried over unchanged.A stream over a non-blocking pty master with a pending read: before this change the rejection lands and the process then hangs, with or without
reader.cancel()orreleaseLock()afterwards.cancel()on an errored stream rejects with the stored error and never reaches the native source.The sync pull path reaches
on_reader_errorfrom insideon_pull. The reader is closed by the timeread_intoreturns, soon_pullreturns the stored error throughend_of_readerin the same call, where it previously returnedPendingwith no poll registered.The second PR, for
tty.ReadStreamon a non-blocking fd (#41414), is built on this branch and needs the poll release: node-pty's pty master reports the child's exit asEIO.Pre-existing failures on a debug build, with or without this change:
test/js/node/process/stdin/stdin-fixtures.test.ts(the runner kills the child after 1 s, a debug child needs 1.1 s) andtest/js/web/streams/streams-leak.test.ts"Absolute memory usage" (times out at 5 s).no test proof · iteration 5 · platform-specific test(s) that do not run on this machine, deferring to CI, which covers all platforms: test/js/web/streams/streams.test.js