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WalkthroughThe formatter now retains visited errors during rendering and propagates pending JavaScript exceptions. Regression tests cover cyclic errors in uncaught output, ChangesCircular error formatting
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Actionable comments posted: 2
🤖 Prompt for all review comments with AI agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.
Inline comments:
In `@test/regression/issue/circular-error-stack.test.ts`:
- Around line 86-88: In test/regression/issue/circular-error-stack.test.ts,
replace the rationale comment at lines 86-88 with the confirmed GitHub issue URL
comment, and remove the duplicate rationale block at lines 123-127; retain only
the single issue-URL comment required for regression tests.
- Around line 90-97: Drain both configured subprocess pipes concurrently in both
test cases: at test/regression/issue/circular-error-stack.test.ts lines 90-97,
include stdout alongside stderr and proc.exited in the Promise.all call; at
lines 105-116, include stderr alongside stdout and proc.exited. No other changes
are needed.
🪄 Autofix
Fix all unresolved CodeRabbit comments on this PR:
- Push a commit to this branch (recommended)
- Create a new PR with the fixes
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src/jsc/ConsoleObject.rstest/regression/issue/circular-error-stack.test.ts
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Checked all five; same printer, different bugs, and this PR was deliberately narrowed to not overlap them.
All five can land independently of this one. |
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LGTM — the fix removes the visited-map removal/re-insertion dance in print_error and adds the same has_exception() propagation already used in print_as_prelude.
What was reviewed:
- Traced the visited-map lifecycle:
print_as_preludeinserts,VisitedRemoveguard removes on exit, and keeping the value in the map duringprint_errorlike_objectcorrectly bounds both the inline-property re-entry (errors: [e]→print_as) and the cause-chain loop atVirtualMachine.rs:6438. - Confirmed the top-level error still prints (the map is only consulted for child re-entries, not the initial render).
- Tests drain both pipes, use
test.concurrent, and the author verified fail-without-fix on both ASAN and release.
Extended reasoning...
Overview
The PR fixes a SIGSEGV in the error printer when an Error is both its own cause and an entry in its own errors array. The change is a net -14 lines in src/jsc/ConsoleObject.rs plus three regression tests.
The production change has two parts:
- Delete the 18-line block in
Formatter::print_errorthat temporarily removed the value from the visited map (via raw pointer +scopeguard::defer!with anunsafere-insertion) before callingprint_errorlike_object. The value now stays in the map, so re-entrant formatting ofcause/errorshits the existing[Circular]guard inprint_as_preludeand the cause-chain loop inprint_error_instance_body. - Add a 3-line
has_exception()check afterprint_errorlike_objectreturns, converting a pending exception intoErr(JsError::Thrown)— the identical pattern already used atConsoleObject.rs:3299inprint_as_prelude.
Security risks
None. This is error-formatting output logic; no auth, crypto, filesystem, or network surface. The change removes an unsafe block rather than adding one.
Level of scrutiny
Medium. The error printer is subtle and this file has several other open PRs targeting adjacent shapes (#35820, #35825, #34892, #34884, #36921), but the author analyzed each and this change is deliberately scoped not to overlap — it fixes only the Formatter::print_error visited-map handling, not the AggregateError branch or StackCheck seating those PRs cover. The removed code was demonstrably wrong (caused a crash), and the replacement is strictly simpler. I traced the map lifecycle through print_as → print_as_prelude (insert) → print_error → print_errorlike_object → property iteration → re-entrant print_as (finds existing → [Circular]) → cause-chain loop at VirtualMachine.rs:6427-6454 (finds existing → [Circular]) → VisitedRemove guard (remove on exit). The top-level error still renders because the map is only consulted for children.
Other factors
- All prior review feedback (my pipe-draining note, CodeRabbit's identical finding, and the comment-cop bot's comment-length flags) was addressed in cf12347/a63cab1/796adb2; every thread is resolved.
- The gate evidence in the description shows all three new tests fail on both ASAN-debug and release without the fix (SIGSEGV / mangled worker message) and pass with it.
- The removed code included a raw-pointer capture inside
scopeguard::defer!with anunsafere-insertion — deleting it is a clear safety improvement. - The added
has_exception()check does not clear the exception, soBun.inspect's stack-overflow rethrow (pinned bybun-inspect.test.ts) is preserved.
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CI status: 195 of 196 jobs passed on 796adb2. The one red lane (darwin 14 x64 test-bun) is test/cli/test/parallel.test.ts, which the CI helper marks as pre-existing (same failure on main) and which this diff does not touch; it has been reported for main-break triage. The remaining entries in the annotation passed alone or on retry. The previously red bun-inspect.test.ts stack-overflow test passes on this revision. |
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Updated 5:28 PM PT - Sep 28th, 2026
✅ @robobun, your commit 9638e773baf4a0dc7b1253d00df04e5772caf3b6 passed in 🧪 To try this PR locally: bunx bun-pr 37270That installs a local version of the PR into your bun-37270 --bun |
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I reviewed this PR and the bug-hunting pass found no issues. The fix itself is small and looks correct — dropping the visited-map removal so the [Circular] guard fires, plus the has_exception() → Err(Thrown) check that mirrors print_as_prelude a few lines up. Given it adjusts the error-printer's exception-return contract (an earlier revision here broke bun-inspect.test.ts) and there are five open PRs touching adjacent guards in the same printer (#35820, #35825, #34892, #34884, #36921), a maintainer glance at the landing order would still be worthwhile.
What was reviewed:
- Traced
print_as→print_as_prelude→print_error: the value now stays inself.mapacrossprint_errorlike_object, so re-entry forcause/errorshits the existingget_or_put→[Circular]path; top-level name/message rendering doesn't go through the formatter, so it isn't shadowed. - Confirmed the new
has_exception()guard matches the pattern atConsoleObject.rs:3289and leaves the exception pending (noclearException). - Tests: pipes drained concurrently, positive assertions only,
test.concurrentfor the subprocess cases; the vacuousASSERTION FAILEDcheck from the previous revision is gone.
Extended reasoning...
Overview
Two files: src/jsc/ConsoleObject.rs (net −14 lines in Formatter::print_error) and three new tests appended to test/regression/issue/circular-error-stack.test.ts. The source change (1) deletes the block that temporarily removed the current error from the formatter's visited map before calling vm.print_errorlike_object, and (2) adds a self.global_this.has_exception() check after that call to convert a pending exception into Err(JsError::Thrown) instead of Ok(()).
Security risks
None. This is diagnostic-output formatting for already-thrown errors; no auth, crypto, parsing of untrusted input, or resource acquisition. The change removes an unsafe scopeguard::defer! block with a raw-pointer write and replaces it with nothing, which is a net safety improvement.
Level of scrutiny
Medium. The diff is small and the mechanism is well-argued, but the error printer's recursion and exception-propagation contract is subtle: the original removed code carried a rationale comment ("circular check already done in print_as"), an earlier revision of this PR broke bun-inspect.test.ts and had to be narrowed, and five open PRs (#35820/#35825/#34892/#34884/#36921) touch adjacent guards in the same call graph. A maintainer should confirm this is the one to land and that keeping the value in the visited set has no unintended effect on non-cyclic error rendering that the existing suites don't cover.
Other factors
- All prior review feedback (comment-cop, CodeRabbit, my two inline nits on pipe draining and the vacuous
ASSERTION FAILEDassertion) is addressed; every thread is resolved. - CI on 796adb2 was 195/196 with the one red job flagged as pre-existing on main; the latest push (60f95cd) only removes one test assertion.
- The PR's evidence block shows the three new tests failing on unfixed debug/ASAN and release builds and passing with the fix, satisfying the fails-for-the-right-reason bar.
- The added exception check follows the exact pattern already used at
ConsoleObject.rs:3289-3290inprint_as_prelude, and per the PR description the pending exception is intentionally not cleared soBun.inspectstill rethrows genuine stack overflows (pinned bybun-inspect.test.ts).
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Two facts from work on a related crash path: an The JSC's property walk ( One case still aborts on current main with this PR's change applied. It does not reproduce on this branch's older base. let deep = new Error("leaf");
for (let i = 0; i < 1000; i++) {
const next = new Error("level " + i);
next.inner = deep;
deep = next;
}
const top = new Error("top");
top.a = deep;
top.b = new Error("sibling");
try { console.error(top); } catch {}The depth guard in Branch Both cases need an assert build. A release build does not crash on them through |
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A separate report reached me: const e = new Error("boom");
e.when = Object.assign(new Date(0), { toJSON() { throw new Error("toJSON threw"); } });
try { console.log([e]); } catch (err) { console.log("threw", err.message); }
console.log("survived");
One sibling is not covered by this PR. const e = new Error("boom");
e.entries = new Map([[Object.assign(new Date(0), { toJSON() { throw new Error("toJSON threw"); } }), {}]]);
console.log(e); // same assertion on a debug build, with or without this PRChange that fixes the sibling, and a test for all of the shapes above--- a/src/jsc/ConsoleObject.rs
+++ b/src/jsc/ConsoleObject.rs
@@ pub mod formatter { (MapIteratorCtx::for_each)
let Ok(key_tag) = Tag::get_advanced(key, global_object, opts) else {
return;
};
- let _ = this.formatter.format::<C>(
- key_tag,
- this.writer,
- key,
- this.formatter.global_this,
- );
+ if this
+ .formatter
+ .format::<C>(key_tag, this.writer, key, this.formatter.global_this)
+ .is_err()
+ {
+ return;
+ }
this.writer.write_all(b": ").expect("unreachable");The C++ iteration stops at the pending exception after the callback returns, so Test for test("an own property of an Error that throws while it is printed", async () => {
const calls = [
"console.log(e)",
"console.log([e])",
"console.log([1, e])",
"console.log([[e]])",
"console.log({ wrapped: [e] })",
'console.log([new Error("outer", { cause: e })])',
'console.log(new Map([["key", e]]).entries())',
"console.table(new Map([[e, 1]]))",
"Bun.inspect([e])",
"console.log(hostileMapKey)",
];
await using proc = Bun.spawn({
cmd: [
bunExe(),
"-e",
`
const hostile = () => Object.assign(new Date(0), { toJSON() { throw new Error("toJSON threw"); } });
const e = new Error("boom");
e.when = hostile();
const hostileMapKey = new Error("boom");
hostileMapKey.entries = new Map([[hostile(), {}]]);
const attempt = (name, call) => {
try {
call();
console.error(name + ": returned");
} catch (err) {
console.error(name + ": threw " + err.message);
}
};
${calls.map(call => `attempt(${JSON.stringify(call)}, () => ${call});`).join("\n")}
`,
],
env: bunEnv,
stdout: "pipe",
stderr: "pipe",
});
const [, stderr, exitCode] = await Promise.all([proc.stdout.text(), proc.stderr.text(), proc.exited]);
expect(stderr).toBe(calls.map(call => `${call}: threw toJSON threw\n`).join(""));
expect(exitCode).toBe(0);
});One interaction to know about. |
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A scope note, from a measurement of the open error-printer PRs against four native stack overflows (table in #36602 (comment)).
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Do not merge this revision yet. A check of deep error chains found a regression in this diff.
Repro: const { Worker } = require("node:worker_threads");
const w = new Worker(
`let e = new Error("leaf"); for (let i = 0; i < 500; i++) { const x = new Error("l" + i); x.cause = e; e = x; } throw e;`,
{ eval: true },
);
w.on("error", x => console.log(x === null ? "null" : x.message));A fix is in progress: the Worker must deliver the error of the user when only the rendering fails. |
robobun
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Nothing blocking. The comments below are optional suggestions. There is no need to push a fix for them before merging.
Beyond the inline findings, I also checked the new VisitedRemove::new guard in print_error_instance_body for aliasing problems — it takes &raw mut formatter.map (no reference is created) and mirrors the existing guard in print_as, so it is not a new pattern — and the expect("unreachable") on get_or_put in visited_enter, which is the same call moved out of print_as and the old errors_to_append loop rather than a new panic path. The double render of a self-listing AggregateError is pre-existing (the member walk is untouched here).
Extended reasoning...
The change moves visited-set ownership for Error rendering from the console formatter into the native error printer in src/jsc/ConsoleObject.rs and src/jsc/VirtualMachine.rs, adds a raw-pointer RAII guard armed by a Cell, and adds subprocess tests; it touches no security-sensitive surface. Six confirmed findings are posted inline (exception-propagation change at the stack bound, output nits, a stale SAFETY comment, and a test-coverage gap), so a human look is already signalled; this note only records the memory-safety candidates that were examined and ruled out as pre-existing patterns.
Additional findings (outside the current diff — GitHub can't attach inline comments there):
-
🟡
src/jsc/VirtualMachine.rs— Minor: an error whose cycle closes through a non-enumerablecause(thenew Error(msg, { cause })form) prints a bare[Circular]line after the stack trace instead ofcause: [Circular],under the key. The fallback at src/jsc/VirtualMachine.rs:7205-7208 pushescauseintoerrors_to_appendwithout thecircularcheck the enumerable loop applies at src/jsc/VirtualMachine.rs:7096. Fix: apply the same in-place[Circular]rendering to the non-enumerablecause(compare againsterror_instanceandvisited_contains) so both spellings ofcauseprint under the key, and add that shape to the test matrix. [also at: src/jsc/VirtualMachine.rs:7250 - nit: A cycle closed by a non-enumerablecause(thenew Error(msg, { cause })form) prints a bare[Circular]after the stack trace with nocause:key, unlike the enumerable case.]Why this was flagged
Input:
const e = new Error("x", { cause: undefined }); e.cause = e; throw e;(the constructor option makescausea non-enumerable own property, and assignment keeps that attribute), orconst a = new Error("a"); const b = new Error("b", { cause: a }); a.cause = b; throw a;. Any printer entry reaches print_error_instance_body. The property iterator at src/jsc/VirtualMachine.rs:7070 is created with DontEnumPropertiesMode::Exclude (src/jsc/bindings/JSPropertyIterator.cpp:87), so the loop with the newcircularcheck at src/jsc/VirtualMachine.rs:7096 never seescause. The fallback at src/jsc/VirtualMachine.rs:7203-7211 pushes the cycliccauseinto errors_to_append unconditionally. At src/jsc/VirtualMachine.rs:7239 the error is recorded, and the loop at 7244 writes "\n" then print_error_instance_js writes[Circular]at src/jsc/VirtualMachine.rs:6676 with no key and no trailing comma. The user seeserror: xfollowed by the frames and then a lone[Circular]line, while the enumerable spelling of the same cycle prints…Verification: nit — triggered whenever a cyclic error's cycle closes through a non-enumerable
cause(thenew Error(msg, { cause })form, which per spec InstallErrorCause createscausevia CreateNonEnumerableDataProperty, and a latere.cause = eassignment keeps the DontEnum attribute). Mechanism verified in /home/claude/bun/src/jsc/VirtualMachine.rs: the own-property iterator at 7070-7081 is built on… -
🟡
src/jsc/ConsoleObject.rs— Maintainers reading theVisitedRemoveDrop get a SAFETY comment that no longer describes its callers. src/jsc/ConsoleObject.rs:1562-1563 saysmap/armed"were taken viaaddr_of!on locals", but the newVisitedRemove::newcaller at src/jsc/VirtualMachine.rs:7060-7061 passes a field of a&mut Formatterparameter andCell::as_ptr(), and the# Safetyclause onnew(src/jsc/ConsoleObject.rs:1548) omits the no-live-borrow condition the Drop comment relies on. Fix: state the real contract once onVisitedRemove::new(pointers outlive the guard and no other borrow of the map is live at drop) and make the Drop comment reference it, so both theprint_asliteral site and the new site are covered.Why this was flagged
REVIEW.md and the root CLAUDE.md require SAFETY comments above
unsafeto be accurate. After this PR the Drop at src/jsc/ConsoleObject.rs:1562-1566 is reached from two constructors: the struct literal inprint_as(src/jsc/ConsoleObject.rs:3324,&raw mut self.map, a field of&mut self, not a local) and the newunsafe fn newcall at src/jsc/VirtualMachine.rs:7058-7064 (&raw mut formatter.mapandrecorded.as_ptr()from aCell<bool>). Neither matches "addr_of! on locals". The# Safetydoc onnew(src/jsc/ConsoleObject.rs:1548-1549) only requires the pointers to stay valid, while the Drop's second clause ("no other borrow is live at drop") is what actually makes the dereference sound, so a future caller can satisfy the documented contract and still violate the real one. The dismissal accepted that the invariant happens to hold today; the finding is that the documented contract is wrong for a newly added public unsafe API. Remedy: rewrite the# Safetyclause onnewto include both conditions and correct the Drop comment.Verification: nit. Triggering condition: any maintainer reading or auditing the
unsafeblock inVisitedRemove::dropafter this PR. The Drop SAFETY comment at /home/claude/bun/src/jsc/ConsoleObject.rs:1562-1563 is unchanged from base and still reads "map/armedwere taken viaaddr_of!on locals that outlive this guard; no other borrow is live at drop." After this PR the struct becomespub(crate)…
…oses the cycle
An Error that reaches itself through two of its own properties crashed the
process when it was printed:
const e = new Error('cyc'); e.cause = e; e.errors = [e]; throw e;
The set of values that are being rendered lived with two of the callers
that start the render of an error. The console formatter recorded an
error and removed it again before it called the printer. The loop that
prints the cause recorded the next error. The uncaught entries recorded
nothing.
Every render of an error passes print_error_instance_js. It now writes
[Circular] for an error that a caller further up is rendering. The body
records the error before the first render it nests, and
print_error_instance_js removes the record when the body returns. An
error that nests no render is never recorded. The console formatter no
longer records errors. It keeps its stack check for them.
An Error-valued own property that closes a cycle is printed in place,
under its key. That includes a cause that is not enumerable. A member of
an AggregateError that is being rendered prints [Circular] on its own
line. The walk over the members is not changed in any other way.
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Revision f2c583d answers the review of 2026-09-27. It replaces the revision that the hold notice of 2026-09-26 is about. Changed for the findings:
Not changed: an assigned The PR is a draft until the release numbers are in the description. |
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Nothing blocking. The comments below are optional suggestions. There is no need to push a fix for them before merging.
Beyond the inline nit, I also checked the record/release pairing of the new recorded flag: the JSValue::ZERO caller in print_externally_remapped_zig_exception can never set it (both property branches are skipped in that mode), print_error_instance_js removes the entry before result? so error exits are covered, and Tag::Error is only produced for JSType::ErrorInstance, so every value that now skips the prelude insert is caught by the visited_contains short-circuit — none of these leak a visited-map entry.
Extended reasoning...
The push since the last review moved the stack check ahead of the is_recorded_by_its_printer early return, added the trailing newline for [Circular] AggregateError members, and nested an object in the "printed twice" fixture, addressing the earlier inline nits. The remaining posted finding is a dead circular branch in the append loop; no security-sensitive surface is touched.
…ng rendered The loop over the own properties prints such an error in place, so it never reaches the queue.
… and CLI (#46021) ### What does this PR do? Hardening. This collects the open pull requests that fix a crash in Bun into one change, and fixes about 20 more crashes that had no pull request. "Crash" here means a segfault, a Rust panic, an abort, a failed assertion, memory corruption that a sanitizer reports, a native stack overflow, or an exception that ends the process and that the program can't catch. With this PR those cases throw a normal error, print a normal CLI error and exit 1, or just work. 306 pull requests are included: 227 whole, and 79 cut down to the crash fix where the rest was a refactor, a feature or a behavior change. Each one was checked against current `main` first. 45 more turned out to be fixed already, and 17 were duplicates. The full list is at the bottom. #### Crashes you could hit in normal use - **`bun build` with macros and a `.env` file crashed at random.** In a repro with many macro modules, more than a third of the builds crashed. Now 3,000 of 3,000 produce the right bundle. (#45960) - **`bun run` and `bunx` aborted if a signal arrived while the child was being spawned.** (#38926, #45965) - **`bun build --compile ./index.js ./public/*` panicked** if an embedded file's name wasn't valid UTF-8. - **A truncated or corrupted compiled executable** died with SIGBUS or a panic at startup. It now prints an error. (#31787, #38251, #41360) - **Dev server:** several `Option::unwrap()` panics after a failed or deleted import (#38046, #44744, #44746), a segfault when an `onLoad` plugin throws while another bundle is queued, a request that hung and then panicked with `bundle active`, and `server.stop()` that never resolved after a client aborted a waiting request. - **`Bun.serve`:** `server.fetch(url, { headers: new Headers() })` followed by a GC segfaulted (#40888). Routes were used after free after `server.reload()` with `tls.serverName` (#38636). - **`text()` and `json()` on a stream of string chunks** could abort the process, a regression in 1.4.0. (#44269) - **`Bun.Transpiler` with `exports.eliminate` or `exports.replace`** aborted on `export default 1` and on most re-export clauses. (#44137) - **A decorated `declare` field in a class expression** with `experimentalDecorators` panicked. (#38095) - **YAML and JSON5 files with a key that isn't a string** panicked with `--no-bundle` and in `Bun.Transpiler`. (#41827) - **`Bun.FileSystemRouter`:** reading `.params` segfaulted when a rejected route candidate left its parameters behind. (#39290, #39291) - **Native addons that call `uv_async_*`, `uv_timer_*`, `uv_idle_*`, `uv_prepare_*`, `uv_check_*`, `uv_queue_work` or `uv_cwd`** aborted with "unsupported uv function" on Linux and macOS. They're implemented now. (#36609, #39652, #39892) - **`--watch` and `--hot`** panicked when the system was out of inotify instances or file descriptors, or when the reload `exec` failed. They print an error now. (#39629, #39975, #44837) - **Paths longer than the path buffer** panicked in `bun install`, the resolver, the bundler, `--compile`, `tsconfig.json` `paths` and `baseUrl`, `package.json` `main` and `sideEffects`, `bun run --filter`, `bun pm diff`, source maps and snapshots. They're ordinary errors now, or they work. (#36340, #37529, #39104, #39650, #43067) - **A Worker that creates a `ShadowRealm` and imports `node:worker_threads` in it** segfaulted. - **`structuredClone` or `postMessage` of an X25519 key** gave an object that aborted the process when read. (#45624) - **`node:stream` web adapters and `node:http2`** could end the process with an exception that no handler could catch. (#45076, #45975) - **Windows:** a watcher panic in a burst of file changes (#44344), a segfault after the machine resumes from sleep (#33015), crashes in the shell's pipe reader (#39638, #43606), and addons that import from `node.exe` without the delay-load hook (#35618). Most of the rest needs unusual input: strings near the 2 GiB limit, buffers that another thread or a getter resizes or detaches in the middle of a call, `worker.terminate()` at a bad moment, running out of memory or file descriptors, very deep nesting, or hostile arguments to `bun:ffi`, `node:vm` and `bun:sqlite`. #### Behavior changes Things that didn't crash before and behave differently now: - `new` on native functions that aren't constructors throws a `TypeError`, as in Node: `util.types.*`, `buffer.isAscii`, `isUtf8`, `transcode`, `resolveObjectURL`, `bun:jsc` exports, `cc()` symbols. It used to return the call's result. They also stop printing as `[class hostname]`. (#34575) - `` $`cmd` `` throws `ERR_INVALID_ARG_VALUE` if an environment variable's name or value contains a NUL byte. It used to cut the value at the NUL. (#44981) - `cc()` functions throw a `TypeError` for arguments that used to reach C as garbage, and `read.*(ptr, NaN)` throws. (#37989, #38057, #40773) - As PID 1, `bun` exits with 128 + the signal number on Ctrl+C or `docker stop`. (#38877) - A `NODE_MODULE` addon that's already loaded by the main thread throws `ERR_DLOPEN_FAILED` when a live Worker loads it too, as in Node. (#39968) - An exception from a `node:vm` context reaches `uncaughtException` handlers. (#39992) `vm.constants.DONT_CONTEXTIFY` returns the real global proxy. (#34623) - `createPrivateKey` rejects an EC JWK whose private value doesn't match its public point. (#33752) - `@dec static {}` is a syntax error, as in TypeScript and esbuild. (#44883) - `clearTimeout` ignores 0 and negative ids, and timer ids no longer wrap. (#44771) - HEAD for a `Response` whose body is an S3-backed `Blob` reports the length that GET sends. (#44734) - `bun:sqlite` and `node:sqlite`: if `iterate()` left a write unfinished on a connection that has a hook, a user function or an authorizer, the write is finished on the connection's next call instead of during garbage collection. If the database is gone too, it's rolled back. - `bun test --bail` runs exit listeners and closes SQLite databases. (#39010) - Dev server: a request for a client script waits while a bundle is in flight (#42733), query strings reach framework routes (#33232), and a request gets a 500 instead of hanging when plugins fail (#36812). #### File formats - `.jsc` bytecode files get a 24-byte footer so they can be verified before decoding. Files from an older Bun are ignored and the source is parsed instead. (#39396) - `node:vm` `cachedData` gets an 8-byte checksum. A blob from an older Bun is rejected, which the API allows. (#32839) - The built-in modules section of a compiled executable changes from format 1 to 2 and carries an engine stamp. (#44907) #### Performance Measured in instructions per operation on release builds of this branch and its base, with an A/A run for the noise floor (0.0 to 0.2 %). No change: `Bun.serve`, `node:http`, WebSocket echo and publish, `bun build` of 3,807 modules, `bun run` with 2,000 imports, `readdir` / `Glob` / `fs.cp` over 23,689 entries, startup and RSS. The binary grows by 176 KB (0.17 %). | Faster | Instructions | | --- | --- | | WebSocket echo of a 1 MB non-ASCII text message | −72 % | | `Bun.inspect` of a large non-ASCII string | −39 % | | `Bun.markdown.html` on large non-ASCII input | −33 % | | `` $`cmd` `` with 300 environment variables | −6 % | | `fs.readSync` | −5 % | | `TextEncoder.encodeInto`, short ASCII strings | −4 % | | async `crypto.pbkdf2`, 16-byte inputs | −17 % | | Slower | Instructions | Why | | --- | --- | --- | | `cc()` calls | +5 to +51 per call | Argument count and type checks, and a check for `close()` (#37989, #38057, #43802, #44921). `dlopen()` calls don't change | | `process.env.X = v` | 38 → 593 per write | Writes aren't cached. Reads don't change (#38871) | | async `crypto.pbkdf2`, inputs of 1 KB or more | +4 to +9 % | Password and salt are copied (#40554) | | `bun build` with an object `--define` used thousands of times | +4.5 % | The object is copied per use (#45969) | #### Not included - Fixes that need a WebKit change: #39967, #42534, #42982, #43764, #43786, #44226. #42185 too: a typed array that has no `ArrayBuffer` yet can't be pinned, so `view.buffer.transfer()` during an async call can still free its bytes. Creating the `ArrayBuffer` up front costs 7 to 12 % on every async `fs` call, so the fix belongs in JSC: an `ArrayBuffer` created while the view is borrowed should start out pinned. - #45442 (`calc()` sums as a flat list): it changes minified output for real stylesheets to survive a `calc()` with 25,000 terms. It deserves its own review. - #40023 (Windows event loop redesign), #29928 (Windows exit path), #40534, #43963, #39571, #42904, #42834, #36355, #43266: refactors or features whose crash is already covered or isn't a crash. - The pull requests marked *(crash fix only)* below should stay open for their other half. ### How did you verify your code works? - **Tests.** Every fix has a test that fails on `main` (a release or an ASAN build) and passes on this branch, except where that isn't practical: code that only runs on Windows or macOS, inputs that need several GB of memory, and a few rare races. Those were checked by hand or by reading. - **Stored repro scripts.** 230 crash repros ran on release and ASAN builds of this branch and of `main`, side by side. Release: 88 no longer crash. ASAN: 106 no longer crash. None crashes that didn't before. What still crashes needs WebKit, is SQLite's own bug, or isn't a crash. The ASAN number is from a later commit than the release number. - **Dev server.** Because one fix makes requests wait, 2,171 generated programs ran random interleavings of edits, build errors, failing plugins, reloads, stops and disconnects with about 120,000 requests. No request hung, was answered twice or got a stale body. `main` hung in 82 of 1,161 programs. This also found the four dev server bugs listed above. - **Path helpers.** 336,000 boundary cases with buffers of exactly the computed size, and 12,003 random calls through 30 JS APIs on an ASAN build, compared with `main`. No sanitizer report, and the results match wherever `main` doesn't panic. - **What worked on 1.4.3 still works.** Reviewers compared behavior with 1.4.3 and took out what changed it: for example an output directory layout change for 9 or more entry points, a `server.reload()` change, and a changed error message for `import("file:///50%deposit.ts")`. - **Not run locally:** the Windows, macOS and FreeBSD code paths. CI compiles and tests them. ### Included pull requests **Bundler, transpiler, CSS, macros** (33) - #33881 bundler: allocate wrapper_ref for CommonJS modules with no non-hoistable statements - #35055 Bun.build plugins: handle filter RegExp flags beyond i/m/v - #37769 bundler: fail the build instead of panicking when the bundle thread cannot create its waker - #37784 bundler: copy inlined env values into the define arena, and give each Bun.build its own env copy *(crash fix only)* - #37858 bundler: fail the build instead of panicking when a plugin answer string cannot be converted - #38046 bun build --server-components: require the bun target and reject directives without a framework *(crash fix only)* - #38095 js_parser: fix panic on decorated declare/abstract fields in class expressions with experimentalDecorators - #38966 bundler: keep deep CSS, export star and composes graphs from overflowing the linker's stack - #38984 bundler: stop an export star ambiguity that loops back into a re-export chain from overflowing the stack - #39113 css: reject stylesheets of 2 GiB or more instead of aborting on an int cast - #39396 bundler: frame .jsc bytecode sidecars and verify them before decoding - #39855 bundler: join the work still on the pools before the bundle is torn down *(crash fix only)* - #41157 dev server: leave out an html link to a cached json module instead of panicking, and mark a new placeholder file stale - #41801 css: decode ill-formed UTF-8 to U+FFFD before tokenizing *(crash fix only)* - #41827 bundler: handle YAML and JSON5 keys that are not strings instead of panicking - #42242 js_parser: compress symbol link chains when following merged declarations - #42387 bundler: check receivers on the Bun.build plugin object and freeze its filters during a build - #42413 Bounds-check the InternalSourceMap window reader - #42657 macros: keep visited values alive so a reused address does not get another value's Expr - #43330 transpiler: do not print an empty `var` for a data file with no named export - #43355 bundler: fix "The memory limit has been exceeded." on large HTML entries - #43658 react-compiler: fix skipped functions and build aborts for dead code in a try body *(crash fix only)* - #44137 js_parser: fix four crashes of exports.eliminate and exports.replace - #44467 js_parser: replace skipped expressions with E::Missing and skip argument checks after a stack overflow - #44662 js_parser: walk binary chains on the heap and check the stack when rewriting decorated #private accesses - #44712 json5: reject sources of 2 GiB or more before parsing instead of aborting on an int cast - #44864 js_parser: walk conditional chains in import()/require() and define keys in a loop - #44883 js_parser: reject a decorator on a class static block, keep decorators out of the body of `declare global` *(crash fix only)* - #45045 Fix a segfault in new Bun.Transpiler(): re-point options.log after the constructor moves its Log - #45604 css: keep a url() in an at-rule prelude as written, and never print the resolved path of a url() *(crash fix only)* - #45748 bundler: put --banner/--footer in the bytecode ESM module record (flags from a parse, entries from JSC) *(crash fix only)* - #45960 macros: give each parse-worker macro VM its own env loader - #45969 js_parser: copy object and array defines per use, and copy the list of a lone JSX spread object *(crash fix only)* **`bun build --compile` and standalone executables** (3) - #31787 Don't crash at startup when a standalone executable's embedded graph is corrupted *(crash fix only)* - #38251 compile: exit with an error instead of SIGBUS when a standalone executable is truncated - #41360 standalone: check every offset in the embedded module graph before reading it **Resolver, module loading, plugins, paths** (25) - #32269 Bun.plugin: validate the namespace without a shared regex - #33183 bun:jsc: filter internal cells out of getProtectedObjects() - #34575 Don't register native functions as their own constructors - #36340 paths: size the thread-local join output buffers to MAX_PATH_BYTES on Windows - #37037 mock.module: reject async factory results that are not objects - #37065 bun:jsc: propagate JSONParse exceptions from samplingProfilerStackTraces - #37529 resolver: don't abort on a package.json sideEffects entry longer than the join buffer - #38179 node:module: throw instead of crashing when module._compile is set to a non-function - #38273 bun test: report a test file or preload the loader cannot resolve instead of exiting; keep the JUnit report valid U… *(crash fix only)* - #38732 paths: compute the common path of 9+ inputs with the same loop as fewer *(crash fix only)* - #39228 paths: strip C:\\ down to the drive root in without_trailing_slash_windows_path *(crash fix only)* - #39650 bun run --filter: stop panicking on workspace paths longer than the path buffer - #40186 resolver: stop deeply nested exports targets from overflowing the stack - #40258 resolver: publish Entry.abs_path through the per-entry mutex - #42183 node:module: reject a _resolveFilename override result that contains a null byte - #42401 node:module: accept any `this` in Module.prototype.require *(crash fix only)* - #42405 Bun.plugin: transpile a copy of typed array onLoad contents - #42414 node:module: end the Module._stat path at the first null byte - #42685 resolver: strip the trailing separator inside bust_dir_cache - #42735 Throw a RangeError instead of aborting when require.resolve paths or Worker preload outgrows its Vector - #43067 Report a path that does not fit a path buffer instead of aborting *(crash fix only)* - #44410 Fix a crash when code from a node:vm context reads require.cache or require.extensions - #44466 Trace the value an object or data module exports from its JSSourceCode - #45044 Bun.plugin: give onLoad's args.path its own bytes - #45117 cjs: do not call an `__esModule` getter during the annotation lookup **Dev server, `bun bake`, routers, `--watch` and `--hot`** (28) - #28793 Stop file watcher thread before Global.exit tears down memory *(crash fix only)* - #32143 bake: fix "Runtime file not found" panic in production builds of custom frameworks - #32443 watcher: don't free the Watcher in the spawn-to-start window *(crash fix only)* - #33232 bake: normalize the HTTP request-target before matching framework routes - #36812 bake: respond 500 and release both RequestContext refs when on_plugins_rejected / OOM drains a deferred framework r… - #37039 bake: report per-file print failures in the dev server instead of serving empty modules - #37276 hot_reloader: take entries_mutex for watcher-thread directory cache probes - #37444 bake: unregister Bake::SourceProvider from the source map table when it is destroyed - #39290 FileSystemRouter: match / against a root-level optional catch-all route *(crash fix only)* - #39291 FileSystemRouter: order dynamic routes by per-segment precedence like Next.js *(crash fix only)* - #39629 watch: report a failed watcher init as an error instead of a crash - #41185 bake: check for exceptions in the production build's module loader hooks and helpers - #41340 bake: skip the directory watch when the directory cannot be opened - #41617 Decide a directory watch event from the watchlist, not from the resolver's cached listing *(crash fix only)* - #42547 bake: re-arm the memory visualizer timer when it fires - #42733 dev server: make a client script request wait for the bundle in flight - #42828 bake: serve routes from a router root outside the project root instead of aborting or answering 404 - #42831 bake: resolve app.root and router roots through one checked join - #42836 bake: report route scan errors instead of aborting, and fail bun build --app on them *(crash fix only)* - #42840 dev server: map a router type's server entry point to the root route of that type - #42862 Bun.serve: return before a pending app.plugins setup() settles *(crash fix only)* - #42920 Do not create a mimalloc heap per FileSystemRouter, reload() or :nth-child(An-B) selector - #42934 dev server: register a client component without evaluating it - #43329 dev server: check the route bundle index of a client script URL before Index::init - #44249 fs.watch: read each directory and close it before descending - #44344 Windows: fix a watcher panic and lost events in a burst of file changes, and a --hot that stops watching a deleted… - #44744 dev server: answer a cached-file lookup only for a graph that bundled the file - #44746 dev server: keep an importer in its own graph when an import fails or is deleted **`Bun.serve`, sockets, HTTP, WebSocket, HTTP/2, QUIC, DNS** (28) - #42667 Reland "usockets(windows): keep a closed poll alive until the outer tick and libuv are done with it" (#39643) - #33015 fix(windows): segfault in uv__wake_all_loops after system resume *(crash fix only)* - #35761 node:quic: detach lsquic ctx pointers before the finalize-order sweep at worker VM teardown - #37082 Bun.serve: terminate FIFO/pipe file responses at EOF - #38024 dns: keep the c-ares uv_poll_t alive while its poll callback is on the stack (Windows) - #38636 serve: fix route use-after-free after reload() with tls.serverName *(crash fix only)* - #40888 server.fetch: copy a Headers argument instead of adopting the wrapper's pointer - #41337 Update lsquic to 4.9.4 and free unsent stateless resets on destroy *(crash fix only)* - #41384 usockets: hold a tick level for the whole of close_all - #41412 Windows: wait for close completions when closing a worker's uv loop - #41516 node:http2: handle an empty byte range in respondWithFile and respondWithFD - #41521 udp: report every binaryType from the getter, reject a dgram bind of the other family *(crash fix only)* - #42188 net: do not assert a two-character host in SocketAddress.parse - #42210 libuv(windows): keep a pipe's completed read counted until its read callback returns - #42334 fetch, Bun.serve: throw a RangeError for Headers that total 4 GiB or more *(crash fix only)* - #43738 usockets: close a socket whose resume the kernel refuses from the loop, not from the caller - #44338 node:http: response trailers travel with the end call of the response *(crash fix only)* - #44433 bake: make the parked-request list non-owning and look up the DevServer when a plugin load settles - #44533 node:quic: capture the handshake while the conn is alive, set the application at session creation - #44734 Bun.serve: answer HEAD for an S3-backed Blob body without an S3 stat - #44751 node:quic: close() waits only for opened streams, and lsquic sends no GOAWAY before HTTP/3 starts *(crash fix only)* - #44897 node:http2: throw instead of panic when the native setNextStreamID() misses its argument - #45076 node:http2: let close() and destroy() win over the refusal of a request - #45341 uws: AsyncSocket::write takes a size_t length, so res.end() sends a body of 2 GiB or more whole - #45522 node:http2: throw for an ALTSVC frame that is too long and for a pushPromise id that is not a stream id - #45676 node:quic: do not reset a stream lsquic has already finished - #45822 node:quic: name a stream in queued session events by a per-session key, not by its address - #45858 Bun.serve WebSocket: a message that does not fit in memory fails one connection, not the server *(crash fix only)* **Streams, Blob, S3, files, `node:fs`** (28) - #33845 io: propagate IoRequestLoop init failure instead of aborting *(crash fix only)* - #36365 prompt: drop debug_assert that rejects answers containing CR - #37090 Deliver FIFO bodies whose writer connects after the reader opens *(crash fix only)* - #38039 node:fs: stop fs.copyFile(src, "") from segfaulting on Windows - #38653 shell(cp): reject copying a directory into itself; walk cp trees without recursion - #39207 Convert scope-object receivers in the chaining functions and inspect.custom fallbacks - #39390 Blob deserialize: reject over-long paths, treat size >= MAX_SIZE as unknown, make slice() non-panicking - #39639 fetch: drop the upload and drain hop refs at VM teardown *(crash fix only)* - #40008 inspect hooks: copy user options with putDirectMayBeIndex *(crash fix only)* - #40462 Windows: FileSink.start({ path }) on a live writer: hand the writer a libuv fd and close the old source *(crash fix only)* - #41440 node:fs: pass the buffer to the read/readv/write/writev callback on error - #41584 Walk the timer pairing heap without recursion - #41608 native-readable: accept a stream with no native handle - #41710 JSSink write(): convert the chunk before resolving the native sink *(crash fix only)* - #42711 webstreams: bound the native recursion through a chain of tees or text streams - #43264 fetch: reject a file: URL whose path has an encoded NUL - #43709 s3: fix double free of a multipart part's bytes on worker terminate - #43950 streams: link readers and writers last, reject their promises as handled - #44036 PipeReader: label a chunk Eof only when the reader is at its end - #44181 streams: throw instead of aborting when a direct stream's text sink cannot take a string chunk - #44195 fs: validate POSIX directory records in one parser, report a malformed record as EIO *(crash fix only)* - #44269 streams: join the string chunks of a text consumer with one allocation - #44490 watch(windows): report a failed child spawn as an error instead of a panic *(crash fix only)* - #44954 process.stdout/stderr with no FileSink: write synchronously, reset after a failed write *(crash fix only)* - #45004 streams: leave a stream alone when a consumer fails to lock it - #45521 FileSink: throw ERR_ILLEGAL_CONSTRUCTOR from the constructor that script reaches by writer.constructor - #45738 s3: own the Blob store across the calls that run user JS - #45975 node:stream: do not touch the web controller after the web side is done **Node-API, V8 API, `bun:ffi`, `process.dlopen`** (15) - #36609 napi: implement uv_cwd on POSIX - #37989 bun:ffi: stop cc() from turning non-numeric pointer arguments into garbage pointers - #38057 bun:ffi: make cc() reject non-numeric i64/u64 arguments instead of passing garbage - #38425 bun:ffi: throw on an empty cc() source array instead of panicking - #39652 napi: implement uv_async_t, uv_queue_work and uv_default_loop on posix - #39805 Share one handle scope implementation between Node-API and the V8 API - #39892 napi: implement uv_idle_t, uv_prepare_t, uv_check_t and uv_timer_t on posix - #40144 bun:ffi: return undefined for a NULL napi_value from cc() and throw the scheduled napi exception - #40773 bun:ffi: add the full byteOffset in read.*, do not truncate it to int32 - #41704 napi: hand the thrown value to napi_get_and_clear_last_exception after napi_run_script - #42960 process.dlopen: run a V8 addon's init function after dlopen() returns - #43797 Fix debug assertion on an empty error message from a V8 addon or SQLite *(crash fix only)* - #43802 bun:ffi: throw a TypeError when a cc() symbol is called after its library's close() - #43940 napi: fail with ERR_BUFFER_TOO_LARGE instead of aborting above the ArrayBuffer limit *(crash fix only)* - #44921 bun:ffi: pad a short call to a cc() symbol with undefined **`node:vm`, workers, process, timers** (19) - #34623 node:vm: run DONT_CONTEXTIFY contexts directly against the real global - #32839 node:vm: reject invalid cachedData instead of crashing - #36921 error printer: clear the pending exception when formatting a non-Error uncaught value throws - #37270 error printer: one render per error, [Circular] under the key that closes the cycle - #38740 bun:test: give each VM its own fake clock *(crash fix only)* - #39864 Report a refused HTTP, bundle, IO or process waiter thread as an error instead of a crash *(crash fix only)* - #39992 process: deliver exceptions reported against a node:vm context to uncaughtException - #41654 node:vm: give each SourceTextModule request the import attributes of the declaration that created it *(crash fix only)* - #41739 Do not forward the inherited IPC channel to spawned scripts and tools - #41769 node:vm: stop compiling accepted cachedData, report each cachedData decode to the GC *(crash fix only)* - #42045 bun:test fake timers: never move the fake clock backwards - #42308 process.execve: throw instead of aborting for a string past the string limits - #42734 node:vm: report cachedData of 2 GiB or more as rejected instead of aborting - #42843 process.dlopen: reject a filename of PATH_MAX or more before dlopen() - #43500 process: accept SIGSTKFLT, SIGPOLL and SIGPWR, and emit every name of a signal number *(crash fix only)* - #44486 worker: stop the start sequence when a handler it calls stops the worker - #44771 timers: allocate ids from one 64-bit counter that never wraps - #44837 --hot: defer a reload during the preloads, and report a reload that cannot start - #44991 Fix a use-after-free in the VM ref-string intern for a string over the length limit **Shell, spawn, CLI, `bun test`, `bun install`** (31) - #30642 Fail fast at startup when simdutf has no usable implementation for this CPU - #34223 Fix four crashes: HTMLRewriter disturbed body, S3 locked-stream upload, ConnectionsList closed parser, shell brace… *(crash fix only)* - #34884 Guard the console and test-runner formatters against native stack overflow on deeply nested values *(crash fix only)* - #36584 process.chdir: publish an immutable cwd slice so no thread sees a torn cwd - #37135 bun test --parallel: hold the JSC API lock while draining the worker's final IPC backlog - #37527 shell(mv): report ENAMETOOLONG instead of panicking when a source name does not fit the path buffers - #37528 cli: stop aborting on absolute script paths longer than 1024 bytes on Windows - #38162 shell(cp): report ENAMETOOLONG instead of panicking on operands longer than the path buffers - #38205 shell(windows): report ENAMETOOLONG for operands that do not fit the path buffer - #39010 bun test: exit through the VM teardown path when --bail stops a run - #39104 bun test: report over-long coverage dir, JUnit outfile and bunfig root instead of panicking *(crash fix only)* - #39638 shell(cat): serve a second cat on the same stdin instead of hanging or panicking - #39641 usockets: report an out-of-descriptors event loop init as an error, not a crash *(crash fix only)* - #40181 shell: stop deeply nested if clauses from overflowing the parser stack - #40885 shell: throw instead of panicking when a ReadableStream is used as a redirect - #41155 ipc: send a queue item larger than 2 GiB in capped write requests - #42298 bun:test: print String objects with 16-bit storage correctly - #42577 bun:test: root the return values toHaveReturnedWith collects - #43606 shell(windows): report a failed pipe reader start through on_reader_error instead of leaking the subprocess *(crash fix only)* - #43838 node:cluster: read a worker's `ack` and `addressType` in the primary only when they are int32 - #44172 node:cluster: refuse a descriptor of the wrong kind in the primary *(crash fix only)* - #44185 node:cluster: one handle for each descriptor that workers name *(crash fix only)* - #44491 bun test: run every callback when native code leaves an exception pending *(crash fix only)* - #44694 shell mv: refuse to copy a directory into itself on the cross-device fallback - #44752 shell: take the command-substitution capture and drop its NUL bytes - #44981 shell: reject NUL bytes in .cwd() and .env() at the native setters - #45206 ini: reject a source of 2 GiB or more in Parser::parse instead of aborting on an int cast *(crash fix only)* - #45348 bun test: fix a segfault in .not.toThrow(Class) when Symbol.hasInstance accepts a thrown string, symbol or BigInt - #45649 shell: replace the output counters in mkdir, cp, ls and touch with the OutputTask queue - #45792 bun test: SIGKILL a spawnSync child that is still running 500 ms after the test's timeout *(crash fix only)* - #45910 create: own the remote-template response buffers instead of parking them in the CLI arena **Web APIs, Buffer, encoding, URL, crypto, zlib, SQLite, Redis and the rest** (96) - #29709 console: guard JSX/Proxy recursion in Bun.inspect (stack overflow SIGSEGV) - #30817 console.takeHeapSnapshot: clear prior snapshots before building - #30956 spawnSync: make signal-forwarding register/unregister safe for concurrent callers *(crash fix only)* - #31505 node:zlib: reject invalid brotli flush values at validation *(crash fix only)* - #31735 node:path: fix win32 drive-relative resolve on non-Windows hosts *(crash fix only)* - #32085 Fix crash when RedisClient onclose/onconnect is set to a non-callable - #32240 Fix BroadcastChannel custom inspect crash with numeric option keys - #33181 Reject interior null bytes in Bun.mmap, Glob.scan, and FileSystemRouter paths *(crash fix only)* - #33752 node:crypto: validate EC JWK private scalar matches public point in createPrivateKey - #34976 spyOn: install and restore through one writer that throws when the object refuses *(crash fix only)* - #35562 structuredClone: purify NaN in deserialized Date timestamp so getTime never returns a forged JSValue - #35618 napi(windows): load addons that import node.exe without win_delay_load_hook - #35757 Coerce later arguments before capturing input buffers in Bun.Transpiler and Bun.RedisClient - #37252 Report UTF-16 to UTF-8 encode counts through size_t so exactly 2^32 written bytes doesn't wrap to 0 - #37338 node:module: build require.cache without user-writable globals and propagate its exceptions *(crash fix only)* - #37340 redis: accept unsubscribe acks that arrive outside subscriber mode - #37370 Error.appendStackTrace: make appending an error's trace to itself a no-op - #37443 node:crypto: fix null deref when worker.terminate() lands during an EC JWK private key import - #37448 jsc: check for exceptions before using a stored constructEmptyArray result *(crash fix only)* - #38009 MessagePort: fix a heap-use-after-free in contextDestroyed(), release ref() when the last 'message' listener is rem… *(crash fix only)* - #38469 napi: settle or refuse async work queued during VM teardown instead of taking a ticket - #38708 Handle 16-bit module sources in the error preview, the new-position fix-up and the REPL *(crash fix only)* - #38821 process.env: make a failed env build throw instead of aborting (Windows 0xC0000409 on Bun.$ / Bun.sql / process.env… - #38871 process.env: coerce to string on every execution of an assignment, not just the first - #38877 cli: exit 128 + signo when bun cannot die from a re-raised signal (bun as container PID 1) - #38926 Clear the inherited signal mask at startup and exec children with an empty one *(crash fix only)* - #39382 Make a failed util.inspect load throw from custom inspect functions instead of aborting - #39481 Always create the error when a native error message exceeds the string length limit - #39651 performance: keep the user timing entry counts exact after clearMarks(name) and clearMeasures(name) - #39775 Turn seccomp SIGSYS traps into ENOSYS so the syscall fallbacks run on Android - #39968 process.dlopen: replay a non-context-aware V8 addon only while no other live VM owns it - #39975 watch: report a failed reload exec as an error instead of a panic *(crash fix only)* - #40346 Give Glob's native scan methods their own private names - #40554 node:crypto: copy password and salt for async pbkdf2 and scrypt - #40567 url: reject URL-encoded input over the WTF decode limit instead of aborting - #40577 url: throw a RangeError instead of aborting when URLSearchParams or FormData outgrows its Vector - #41073 Store array-index property names as indexed properties in native object builders - #41137 Write the sampling profiler report at exit from Bun, not JSC's atexit hook - #41365 webview: fail only the view when WebKit lacks initWithDirectory: - #41574 Decode a private copy of a JS buffer in the UTF-8 decoders *(crash fix only)* - #41652 console: read a BigInt depth option by value in console.dir - #41749 Startup: reopen fd 0-2 as /dev/null only when the fd is closed - #41819 Report an incoherent BUN_JSC_* option combination as a configuration error, not a crash *(crash fix only)* - #42158 webview: reject malformed Chrome replies instead of crashing - #42179 shell: clamp a `> ${buf}` redirect to the target buffer's live length - #42187 node:crypto: throw ERR_OUT_OF_RANGE for >2 GiB buffer arguments instead of aborting - #42191 URLPattern: throw instead of aborting when a pattern string passes the string limit - #42192 Copy WebAssembly.Memory bytes for native borrows that outlive the call *(crash fix only)* - #42198 Make Bun.$, Bun.sql, Bun.postgres and Bun.SQL custom value getters so reifying the Bun object passes exception chec… - #42203 node:fs: fs.read into a WebAssembly.Memory view writes into the block a grow freed - #42214 Headers: throw a RangeError instead of aborting when the set-cookie list cannot grow - #42218 Headers: throw instead of aborting when a value passes the string length limit - #42220 URLPattern: throw instead of aborting when the token list cannot grow - #42225 Throw ERR_STRING_TOO_LONG from Bun.wrapAnsi instead of aborting when the output passes the string length limit - #42226 Throw instead of aborting when a MIME string does not fit in a string *(crash fix only)* - #42237 Bun.Cookie: throw instead of aborting when the Set-Cookie string passes the string length limit - #42249 Copy a shared input before libdeflate compresses it in Bun.gzipSync and Bun.deflateSync - #42253 bun test: walk nested describe scopes without native recursion - #42259 Throw instead of aborting when a domainToASCII host passes the string length limit - #42310 Parse a private copy of a shared or resizable buffer in Bun.Transpiler, Bun.markdown, Bun.YAML and Bun.TOML *(crash fix only)* - #42312 YAML, JSON5, XML stringify: throw instead of aborting when the output passes the string length limit - #42318 Bound libdeflate's emit path so a racing input cannot overrun the output - #42338 inspector: check the type of process.argv in getModuleGraph - #42364 node:perf_hooks: do not truncate the monitorEventLoopDelay resolution to int32 - #42412 transpiler cache: reject an entry with no sourcemap section - #42479 worker_threads: do not abort when markAsUntransferable/markAsUncloneable gets a WebAssembly GC reference - #42517 EventTarget: skip a listener object that has no realm - #42518 fs.Stats: make the date accessors define the property like Object.defineProperty *(crash fix only)* - #42575 Stop natives from writing onto a foreign `this` with putDirect: process.ppid, require.cache, StringDecoder, the nat… *(crash fix only)* - #42631 JSStringView: pin the cell that owns the borrowed characters - #42660 bun_core: read /dev/urandom when getrandom(2) answers ENOSYS or EPERM - #42780 node:crypto: treat a name too long to convert to UTF-8 as unknown instead of aborting - #42782 node:crypto: throw ERR_OUT_OF_RANGE for a passphrase larger than INT_MAX bytes - #42856 url: do not abort when a host is too long for the IDNA conversion buffers - #42868 sqlite, console, process: do not abort on a string too long to convert to UTF-8 *(crash fix only)* - #42941 Bun.sliceAnsi: throw instead of aborting when the result passes the string length limit - #43058 Bun.serve: fix crash and cross-request 500 when inspecting a non-Response return value throws - #43904 JSC bindings: build property keys from a BunString through Bun::toIdentifier - #44124 Bun.Image: decode WebP into a Bun-owned canvas and read ICCP without the demuxer *(crash fix only)* - #44190 Convert scope-object receivers before Buffer read*/write* and vm.Script describe them - #44211 Stop getsockname(out), useFakeTimers() and the stream source pull() from writing onto a caller's object with putDirect - #44295 bun test --coverage: append a final newline to a text that lacks one *(crash fix only)* - #44360 rust-argon2: return OutOfMemory instead of aborting when the memory cost cannot be allocated - #44421 node:zlib: free zstd's workers before the dictionary they read - #44521 util.parseArgs: pick the default args start from a per-VM eval flag, as Node v26 does *(crash fix only)* - #44740 structured clone: tolerate a zero-sized shared WebAssembly.Memory in computeMemoryCost() - #44759 HTMLRewriter: park a suspended handler's token before the output flush - #44907 Builtins section format 2: an engine stamp says which buns compile its modules - #45188 Reject an oversized WebCrypto cipher output instead of aborting - #45354 Throw for a `file:` URL whose path is not UTF-8 on Linux and macOS, through one `fileSystemPath()` accessor *(crash fix only)* - #45608 ipc: refuse an over-long message before the receive buffer stores it - #45624 webcrypto: write the key type into the X25519 structured-clone record - #45625 node:sqlite: refuse session.close() and Symbol.dispose inside a SQLite callback - #45653 glob: a group with `?` or a class matches when an alternative takes 64 bytes or more - #45820 Bun.file, S3Client.file and Bun.write no longer keep a buffer path alive forever - #45832 `bun check`: fix a panic on `export *` without a module specifier, and a false error for one in parentheses ### Already fixed on `main`, or duplicates of a pull request above Already fixed: #27323 #30401 #31011 #31206 #31566 #31626 #31695 #31702 #31945 #32773 #34154 #34697 #34744 #34964 #35655 #35816 #36020 #36181 #36296 #36342 #36581 #36602 #36807 #36818 #36857 #37172 #37235 #37239 #37267 #37420 #37731 #37914 #38113 #38119 #38509 #38514 #38540 #38975 #39410 #40749 #41163 #41171 #42108 #43085 #43230 Duplicates: #45654 #29986 #33378 #36895 #37070 #37639 #38014 #39021 #41266 #42250 #42951 #43238 #44259 #45335 #45565 #45726 #45965 Fixes #5019 Fixes #6106 Fixes #10690 Fixes #10886 Fixes #13566 Fixes #14745 Fixes #15551 Fixes #20454 Fixes #21310 Fixes #29145 Fixes #30454 Fixes #30613 Fixes #30766 Fixes #32103 Fixes #32142 Fixes #32183 Fixes #32212 Fixes #39060 Fixes #42296 Fixes #42931 Fixes #43671 Fixes #44201 Fixes #44735 Fixes #44783 Fixes #45198 Fixes #45327 Fixes #45491 Fixes #45721 --------- Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>
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This is Claude (an AI assistant) commenting on Jarred's behalf. This fix went in with #46021, which is merged. Closing. |
Stacked on #44139.
Problem
const e = new Error('cyc'); e.cause = e; e.errors = [e]; throw e;prints about 2,100 lines, then SIGSEGV (rc 139).Formatter::print_error(src/jsc/ConsoleObject.rs) removed it before the call. The uncaught entries made none.Fix
print_error_instance_js(src/jsc/VirtualMachine.rs) prints[Circular]for an error that a caller is rendering. Every render passes it.cause: [Circular],.test/js/bun/util/inspect-error.test.js(15 new, 14 fail on main),test/js/node/worker_threads/worker_threads.test.ts(1 new).Background
[Circular].Downsides
throw: an error with an object property costs 1 more hash insert and lookup, an error with a cause 2 more lookups, a plain error none.console.logandBun.inspectcost less.throw(Guard the console and test-runner formatters against native stack overflow on deeply nested values #34884).Notes
Status. #44268 covers this PR and lists it under Fixes. This PR stays open as the small fallback until that one lands. I do not push to it any more.
All numbers: linux x64, main a4f1429 and this branch.
Pool takes / hash inserts / hash lookups per print (release build, gdb hit counts of
LocalKey::withfor the pool,HashMap<JSValue, ()>::get_or_put_slotand::get_index, difference of 80 and 40 prints):Bun.inspect(new Error("x")),console.logof itBun.inspectof an Error with primitive propertiesBun.inspectof an Error with an object propertyBun.inspectof an Error with a causeBun.inspectof an AggregateError of 2Bun.inspect({ a: 1, b: [1, { c: 2 }] })reportError(new Error("x")), also with primitive propertiesreportErrorof an Error with an object propertyreportErrorof an Error with a causereportErrorof an AggregateError of 2reportErrorandthrowuse the same printer entry.Syscalls (gdb
catch syscall, entries plus returns, release):throw new Error('x')477 -> 477. With an object property 477 -> 477. With a cause 477 -> 477. Fore.cause = e; e.errors = [e]510 -> 477 (write38 -> 4).Binary.
sizeof the release binary:.text80660492 -> 80659212 bytes (the same as #44139). Code of the printer functions (nm -S): 18958 -> 18744 bytes.Formatterhas no new field. Instructions were not measured:perfandvalgrindare not installed.Stack reserved per function (
sub ...,%rsp). Release:Formatter::print_error40 -> 32 B,print_error_instance_js5176 -> 5176 B,print_error_instance_body376 -> 376 B,agg_iter0 -> 24 B. Debug+ASAN:Formatter::print_error736 -> 448 B,print_error_instance_js3488 -> 3616 B,print_error_instance_body10816 -> 10752 B,agg_iter704 -> 800 B. One nested render through the cause loop, debug+ASAN: 14304 -> 14368 B. Through the formatter: 20576 -> 20352 B.Output. Debug+ASAN build, one process per output. 38 values through 10 entries (
console.log,console.error,console.log(v, v),Bun.inspectat depth 2, 0 and Infinity,util.inspect,throw,Promise.reject,reportError): 380 outputs.Bun.inspectat depth Infinity of an AggregateError that lists itself prints 1001 levels before the stack check stops it, main 1013.e.self = eatthrowself: [Circular],e.cause = e; e.errors = [e]atthrowa.x = [b]; b.y = batthrowa.cause = b; b.cause = aatconsole.lognew Error("b", { cause: a })witha.cause = b[Circular]cause: [Circular],e.cause = e; e.errors = [e]messageis the rendered textError: cycWhat the first revision of this PR had, and why it is gone. The first revision removed the un-record in
Formatter::print_errorand made that function returnErrwhen the printer left an exception pending. A check of deep chains found that anode:worker_threadsWorker then reportednullto its parent when the render of its uncaught error failed:on_unhandled_rejection(src/jsc/web_worker.rs) takes theJSC::Exceptioncell for the value onErr. #38560 fixes that reporter. TheErrchange is not part of this PR now. It can follow #38560 as its own change. The debug-build aborts that it fixed (comments of 2026-09-11 and 2026-09-13 on this PR) are not fixed by this revision.Also not fixed here. An AggregateError that lists itself still renders once per level, to the depth cap (#36602). An assigned
causeis still rendered twice at each nested level.Suites run (debug+ASAN):
inspect-error.test.js,inspect.test.js,bun-inspect.test.ts,reportError.test.ts,console-log.test.ts,circular-error-stack.test.ts,circular-error-stack-edge-cases.test.ts,test/js/bun/test/stack.test.ts.Self-review. 9 concerns raised, 9 addressed. Addressed by a smaller diff: the AggregateError walk keeps its shape (a self-listing AggregateError lost its header in a larger draft), no change to
web_worker.rs(#38560 owns it) or to the REPL, the groundwork is its own PR, fewer tests that spawn a process, the console formatter keeps its stack check for errors, release numbers are in this description.[human-review] gate passed · iteration 2 · 4 files touched
fails on main (without fix)
passes on PR (with fix)
diff hotspot
gate history · 5 passed · 0 rejected · iteration 2
evidence per changed file