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…s.wait
A worker thread parked in `Atomics.wait` stays blocked across
`worker.terminate()` — the returned promise never resolves. This hangs
any library that awaits termination, most notably tinypool's
`pool.destroy()`.
Root cause: JSC's `WaiterListManager::waitSyncImpl` exits its loop on
`vm.hasTerminationRequest()`, but the flag is only set by
`VMTraps::handleTraps()`, which runs on the VM's own thread at a JS
interrupt point. A thread parked inside a host function never reaches
one, so even after the parent fires `notifyNeedTermination` and the
syncWaiter's condition is notified, the wait loop re-evaluates with the
flag still false and parks again.
Add a new `JSC__VM__requestAndNotifyTermination` binding that sets
`hasTerminationRequest` directly on the child VM from the parent thread
and signals `vm.syncWaiter()->condition()`. The wait loop wakes,
observes the flag, returns `WaitSyncResult::Terminated`, and
`atomicsWaitImpl` throws a termination exception which unwinds back to
the worker's event loop and triggers the normal `exitAndDeinit` path.
Also tolerate a pending termination exception in
`JSGlobalObject.handleRejectedPromises` — it's called from the worker
event loop's tick, and during termination the exception is expected, so
swallow it instead of `@panic("unreachable")`.
Fixes #29173
|
Updated 5:51 PM PT - Apr 11th, 2026
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WalkthroughAdds a VM termination API that sets a termination-request flag and notifies sync-waiters so threads blocked in Atomics.wait observe termination; prevents panics from promise-rejection handling during shutdown; updates worker termination path to use the new API; and adds regression tests verifying blocked workers are unblocked by terminate. Changes
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Actionable comments posted: 2
🤖 Prompt for all review comments with AI agents
Verify each finding against the current code and only fix it if needed.
Inline comments:
In `@src/bun.js/bindings/JSGlobalObject.zig`:
- Around line 661-667: The current catch on the fromJSHostCallGeneric call in
the JSGlobalObject rejection path swallows every error (including fatal ones
like error.OutOfMemory); change the catch to inspect the caught error from
bun.jsc.fromJSHostCallGeneric(this, `@src`(),
JSC__JSGlobalObject__handleRejectedPromises, .{this}) and only suppress
termination-related JSC exceptions (e.g., error.JSError / those raised when
hasTerminationRequest is set and coming from TopExceptionScope), while
re-throwing or returning any other errors (notably error.OutOfMemory) so OOMs
still crash; locate this logic around handleRejectedPromises /
fromJSHostCallGeneric and replace the blanket catch {} with a conditional error
check that preserves non-termination errors.
In `@test/regression/issue/29173.test.ts`:
- Around line 41-45: Replace the sleep-based synchronization with an explicit
handshake: modify the worker to post a "parking" message immediately before
calling Atomics.wait, and in the test (where variable w represents the Worker)
remove the setTimeout and instead await receiving that "parking" message from w
(e.g., using a Promise that resolves on w.once('message', ...) or equivalent)
before calling w.terminate(); apply the same change to the other occurrence
mentioned (lines around 89-90) so both tests wait for the explicit ready-to-park
signal rather than a fixed delay.
🪄 Autofix (Beta)
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/bun.js/bindings/JSGlobalObject.zigsrc/bun.js/bindings/VM.zigsrc/bun.js/bindings/bindings.cppsrc/bun.js/web_worker.zigtest/regression/issue/29173.test.ts
![claude[bot]](https://avatars.githubusercontent.com/in/1236702?s=60&v=4){kind=small}
- bindings.cpp: switch JSC__VM__requestAndNotifyTermination from a one-shot
syncWaiter condition notify to firing the NeedTermination trap via
vm.notifyNeedTermination(). This engages VMTraps::SignalSender which
repeatedly signals the syncWaiter condition at 1ms intervals (and sends
a POSIX signal to the target thread), closing the classic missed-wakeup
race where a single notifyOne can be lost if the worker hasn't registered
on the condition yet. setHasTerminationRequest is still called first so
the very first wake observes the flag in the wait loop's predicate check.
- JSGlobalObject.zig: replace blanket `catch {}` in handleRejectedPromises
with an exhaustive `switch (err) { error.JSError => {} }` — only one
error variant is possible today, but if the set ever grows the compiler
will force a review instead of silently swallowing new variants.
- test/regression/issue/29173.test.ts: mark both tests test.concurrent (they
spawn independent subprocesses with no shared state), drop the setTimeout
synchronizers (the new notifyNeedTermination path is race-free against
a not-yet-parked worker — SignalSender keeps signalling until the trap
is cleared), and relax the exit-code assertion since the worker's exit
code after a termination-exception unwind is now 1 (matches Node).
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Actionable comments posted: 1
♻️ Duplicate comments (1)
test/regression/issue/29173.test.ts (1)
45-50:⚠️ Potential issue | 🟠 MajorMake the parked state explicit before
terminate()for deterministic coverage.Line 50 and Line 94 can still pass when termination happens before the worker actually reaches
Atomics.wait, which weakens this regression’s signal. Add a"parking"handshake sent immediately beforeAtomics.wait, and wait for it before callingterminate().Proposed test hardening
- ' const arr = new Int32Array(msg.sab);' + - ' Atomics.wait(arr, 0, 0);' + + ' const arr = new Int32Array(msg.sab);' + + ' parentPort.postMessage("parking");' + + ' Atomics.wait(arr, 0, 0);' + '});'; @@ - w.postMessage({ sab }); + w.postMessage({ sab }); + await new Promise((r) => + w.once("message", (m) => { + if (m === "parking") r(undefined); + }), + ); // Node resolves with 1 here; what matters for the regression is // that the promise resolves at all (it never did before the fix). await w.terminate(); @@ - w.postMessage({ sab }); + w.postMessage({ sab }); + await new Promise((r) => + w.once("message", (m) => { + if (m === "parking") r(undefined); + }), + ); workers.push(w);Also applies to: 89-95
🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed. In `@test/regression/issue/29173.test.ts` around lines 45 - 50, The test can nondeterministically call w.terminate() before the worker reaches Atomics.wait, weakening the regression signal; modify the worker handshake to send an explicit "parking" message immediately before calling Atomics.wait and update the test to await that "parking" message (using w.once("message", ...) or similar) before posting the SharedArrayBuffer and calling w.terminate(), so the test deterministically ensures the worker is parked (referencing the worker event handler using w.once("message", r), the posted { sab } object, Atomics.wait in the worker, and w.terminate()).
🤖 Prompt for all review comments with AI agents
Verify each finding against the current code and only fix it if needed.
Inline comments:
In `@test/regression/issue/29173.test.ts`:
- Around line 59-60: Remove the brittle empty-stderr assertions that call
stripAsanNotice(stderr) and expect it toEqual "" in this regression test;
instead rely on the process exitCode and the stdout assertion as the stability
signal. Concretely, delete or comment out the
expect(stripAsanNotice(stderr)).toBe("") calls and keep the
expect(stdout).toBe("terminated\n") (and any exitCode/assertions that check
process termination). If you need to validate specific error output, replace the
broad empty check with a targeted expect against the exact expected stderr
message; otherwise do not assert on stderr.
---
Duplicate comments:
In `@test/regression/issue/29173.test.ts`:
- Around line 45-50: The test can nondeterministically call w.terminate() before
the worker reaches Atomics.wait, weakening the regression signal; modify the
worker handshake to send an explicit "parking" message immediately before
calling Atomics.wait and update the test to await that "parking" message (using
w.once("message", ...) or similar) before posting the SharedArrayBuffer and
calling w.terminate(), so the test deterministically ensures the worker is
parked (referencing the worker event handler using w.once("message", r), the
posted { sab } object, Atomics.wait in the worker, and w.terminate()).
🪄 Autofix (Beta)
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/bun.js/bindings/JSGlobalObject.zigsrc/bun.js/bindings/bindings.cpptest/regression/issue/29173.test.ts
| expect(stripAsanNotice(stderr)).toBe(""); | ||
| expect(stdout).toBe("terminated\n"); |
There was a problem hiding this comment.
Drop empty-stderr assertions in regression subprocess tests.
Line 59 and Line 103 still enforce empty stderr (after one-line filtering), which is brittle in CI/runtime variants. For this regression, keep stdout + exitCode as the stability signal.
Proposed fix
- const [stdout, stderr, exitCode] = await Promise.all([proc.stdout.text(), proc.stderr.text(), proc.exited]);
- expect(stripAsanNotice(stderr)).toBe("");
+ const [stdout, _stderr, exitCode] = await Promise.all([proc.stdout.text(), proc.stderr.text(), proc.exited]);
expect(stdout).toBe("terminated\n");
expect(exitCode).toBe(0);
@@
- const [stdout, stderr, exitCode] = await Promise.all([proc.stdout.text(), proc.stderr.text(), proc.exited]);
- expect(stripAsanNotice(stderr)).toBe("");
+ const [stdout, _stderr, exitCode] = await Promise.all([proc.stdout.text(), proc.stderr.text(), proc.exited]);
expect(stdout).toBe("terminated 2 workers\n");
expect(exitCode).toBe(0);Based on learnings: In test/regression/issue/*.test.ts, avoid asserting spawned Bun subprocess stderr is empty; use exitCode as the crash/failure signal unless validating a specific expected stderr message.
Also applies to: 103-104
🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed.
In `@test/regression/issue/29173.test.ts` around lines 59 - 60, Remove the brittle
empty-stderr assertions that call stripAsanNotice(stderr) and expect it toEqual
"" in this regression test; instead rely on the process exitCode and the stdout
assertion as the stability signal. Concretely, delete or comment out the
expect(stripAsanNotice(stderr)).toBe("") calls and keep the
expect(stdout).toBe("terminated\n") (and any exitCode/assertions that check
process termination). If you need to validate specific error output, replace the
broad empty check with a targeted expect against the exact expected stderr
message; otherwise do not assert on stderr.
There was a problem hiding this comment.
♻️ Duplicate comments (1)
test/regression/issue/29173.test.ts (1)
59-60:⚠️ Potential issue | 🟠 MajorRemove brittle empty-
stderrassertions in these subprocess checks.Line 59 and Line 106 still require cleaned
stderrto be empty; that remains flaky across ASAN/CI variants. For this regression,stdout+exitCodeare the stable signals.Proposed fix
- const [stdout, stderr, exitCode] = await Promise.all([proc.stdout.text(), proc.stderr.text(), proc.exited]); - expect(stripAsanNotice(stderr)).toBe(""); + const [stdout, _stderr, exitCode] = await Promise.all([proc.stdout.text(), proc.stderr.text(), proc.exited]); expect(stdout).toBe("terminated\n"); expect(exitCode).toBe(0); @@ - const [stdout, stderr, exitCode] = await Promise.all([proc.stdout.text(), proc.stderr.text(), proc.exited]); - expect(stripAsanNotice(stderr)).toBe(""); + const [stdout, _stderr, exitCode] = await Promise.all([proc.stdout.text(), proc.stderr.text(), proc.exited]); expect(stdout).toBe("terminated 2 workers\n"); expect(exitCode).toBe(0);Based on learnings: In
test/regression/issue/*.test.ts, avoid asserting spawned Bun subprocessstderris empty; useexitCodeas the primary crash/failure signal unless validating specific expected stderr content.Also applies to: 105-106
🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed. In `@test/regression/issue/29173.test.ts` around lines 59 - 60, Remove the brittle empty-stderr assertions by deleting or disabling the expect(stripAsanNotice(stderr)).toBe("") assertions in this test (and the duplicate instance using the same expression later), and rely on stable signals (stdout and exitCode) instead; update the test to assert stdout === "terminated\n" and the expected exit code (or other exitCode-based checks) but do not assert that stripAsanNotice(stderr) is empty, leaving stderr unasserted unless you are validating specific expected stderr content.
🤖 Prompt for all review comments with AI agents
Verify each finding against the current code and only fix it if needed.
Duplicate comments:
In `@test/regression/issue/29173.test.ts`:
- Around line 59-60: Remove the brittle empty-stderr assertions by deleting or
disabling the expect(stripAsanNotice(stderr)).toBe("") assertions in this test
(and the duplicate instance using the same expression later), and rely on stable
signals (stdout and exitCode) instead; update the test to assert stdout ===
"terminated\n" and the expected exit code (or other exitCode-based checks) but
do not assert that stripAsanNotice(stderr) is empty, leaving stderr unasserted
unless you are validating specific expected stderr content.
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test/regression/issue/29173.test.ts
| // the child VM from the parent thread and signal the syncWaiter's condition, | ||
| // so the wait loop observes the flag on wakeup and returns | ||
| // `WaitSyncResult::Terminated`. | ||
| test.concurrent("worker.terminate() unblocks a worker parked in Atomics.wait", { timeout: 30_000 }, async () => { |
There was a problem hiding this comment.
🟡 Both test.concurrent calls set { timeout: 30_000 }, directly violating test/CLAUDE.md line 120: "CRITICAL: Do not set a timeout on tests. Bun already has timeouts." The comment on line 67 even says the test was "kept small (N=2) so the debug-ASAN build fits in the default per-test timeout", which contradicts having an explicit 30 s override — if it fits within the default, the override is unnecessary and should be removed.
Extended reasoning...
What the bug is and how it manifests
Both test.concurrent calls in 29173.test.ts pass { timeout: 30_000 } as their second argument. This is the Bun test-runner per-test timeout option. test/CLAUDE.md line 120 states: "CRITICAL: Do not set a timeout on tests. Bun already has timeouts." Both calls violate this rule directly and identically. These are new tests added by this PR and should comply with project guidelines from the start.
The specific code path
Line 20: test.concurrent("worker.terminate() unblocks a worker parked in Atomics.wait", { timeout: 30_000 }, async () => {
Line 69: test.concurrent("worker.terminate() unblocks multiple workers parked in Atomics.wait", { timeout: 30_000 }, async () => {
Why existing code does not prevent it
The Bun default per-test timeout is 5 seconds (from src/cli.zig, default_timeout_ms: u32 = 5 * std.time.ms_per_s). The explicit 30 s value is a real override — not a no-op. Nothing in the test framework prevents setting it; the CLAUDE.md rule is the only enforcement mechanism, and it is being violated here.
Addressing the refutation
One verifier argued the rule only prohibits using setTimeout as a synchronization mechanism, not the test-runner timeout option. This conflates two separate CLAUDE.md rules. Line 120 reads: "Do not set a timeout on tests. Bun already has timeouts." This unambiguously refers to the { timeout: N } option passed to test(). A separate rule elsewhere prohibits using setTimeout for condition synchronization. Both rules exist independently.
Concrete step-by-step proof of the contradiction
- The comment on line 67 reads: "Kept small (N=2) so the debug-ASAN build fits in the default per-test timeout."
- The comment explicitly states the N=2 choice was made to fit within the DEFAULT timeout.
- Yet the same test sets { timeout: 30_000 }, overriding the default to 30 s — 6x the 5 s default.
- These two facts contradict each other: if the test fits the default, the override is unnecessary. If it does not fit the default without the override, the comment is misleading and the test design needs re-evaluation.
- Either way, the explicit { timeout: 30_000 } violates the CRITICAL rule.
How to fix it
Remove the { timeout: 30_000 } option from both test.concurrent calls. If ASAN debug builds genuinely require more than 5 seconds, the correct approach is to adjust the global timeout configuration for CI rather than silently override per-test timeouts in violation of project policy.
There was a problem hiding this comment.
Both test.concurrent calls still set { timeout: 30_000 } (lines 20 and 71), directly violating test/CLAUDE.md line 120: "CRITICAL: Do not set a timeout on tests. Bun already has timeouts." The comment on line 67–68 says the test was "Kept small (N=2) so the debug-ASAN build fits in the default per-test timeout", which contradicts having a 30 s override. If the test genuinely fits within the default timeout, { timeout: 30_000 } is unnecessary and should be removed.
There was a problem hiding this comment.
Both test.concurrent calls still set { timeout: 30_000 } (lines 20 and 71), directly violating test/CLAUDE.md line 120: "CRITICAL: Do not set a timeout on tests. Bun already has timeouts." The comment on lines 67–68 says the test was "Kept small (N=2) so the debug-ASAN build fits in the default per-test timeout", which contradicts having an explicit 30 s override. If the test genuinely fits within the default timeout, { timeout: 30_000 } is unnecessary and should be removed from both test.concurrent calls.
There was a problem hiding this comment.
Both test.concurrent calls still set { timeout: 30_000 } (lines 20 and 71), directly violating test/CLAUDE.md line 120: "CRITICAL: Do not set a timeout on tests. Bun already has timeouts." The comment on lines 67–68 says the test was "Kept small (N=2) so the debug-ASAN build fits in the default per-test timeout", which contradicts having an explicit 30 s override. If the test genuinely fits within the default timeout, { timeout: 30_000 } is unnecessary and should be removed from both test.concurrent calls.
| expect(stripAsanNotice(stderr)).toBe(""); | ||
| expect(stdout).toBe("terminated\n"); |
There was a problem hiding this comment.
🟡 The stripAsanNotice helper uses /^WARNING: ASAN interferes .\n/m without the g flag, so expect(stripAsanNotice(stderr)).toBe("") at lines 59-60 and 103-104 only strips the first ASAN warning line — additional ASAN output (from SignalSender activity, continuation notices, etc.) leaves the assertion failing on ASAN CI. Per the established repo pattern for test/regression/issue/.test.ts, drop the stderr collection and stripAsanNotice call entirely and rely on expect(stdout).toBe("terminated\n") and expect(exitCode).toBe(0) as the regression signals.
Extended reasoning...
What the bug is and how it manifests. Lines 59-60 and 103-104 assert expect(stripAsanNotice(stderr)).toBe(""). The stripAsanNotice helper is s.replace(/^WARNING: ASAN interferes .*\n/m, ""). String.prototype.replace without the g flag only removes the first match. ASAN-enabled builds routinely emit more than one warning line — e.g. a continuation notice ("ASAN: WARNING: Continue anyway? To silence reports, set ASAN_OPTIONS=silence_reports=1"), additional shadow-memory warnings, or per-worker JSC signal-handler warnings triggered by the SignalSender this very PR introduces. Any extra line leaves the sanitised string non-empty and the assertion fails.
The specific code path that triggers it. The new fix calls vm.notifyNeedTermination() inside requestAndNotifyTermination, which starts JSC VMTraps::SignalSender. SignalSender delivers POSIX signals repeatedly to the worker thread at 1ms intervals. On ASAN builds, each signal delivery can cause the runtime to print an additional WARNING: ASAN interferes line beyond the single line that stripAsanNotice strips. With two workers in the second test, each worker can independently generate its own warning.
Why existing code does not prevent it. The replace call lacks the g flag. There is no loop, no recursive strip, and no whitelist of permitted stderr content. Even a single extra line emitted by ASAN is sufficient to produce a non-empty string after the one-shot strip.
What the impact would be. Spurious CI failures on every x64-asan build. The underlying fix is correct; the tests would falsely report it broken on ASAN builds, blocking merges.
How to fix it. Drop the stderr collection and the stripAsanNotice call entirely. The existing expect(stdout).toBe("terminated\n") and expect(exitCode).toBe(0) assertions are sufficient: a hang produces a timeout failure and a crash produces a non-zero exit code. The stripAsanNotice function and the stderr variable can both be deleted.
Step-by-step proof. (1) ASAN build starts worker. (2) requestAndNotifyTermination fires, starting SignalSender. (3) SignalSender sends SIGUSR2 to the worker thread. (4) ASAN prints line 1: WARNING: ASAN interferes with JSC signal handlers. (5) ASAN optionally prints line 2: ASAN: WARNING: Continue anyway? To silence reports, set ASAN_OPTIONS=silence_reports=1. (6) stripAsanNotice strips only line 1. (7) stderr is now non-empty (contains line 2). (8) expect(stripAsanNotice(stderr)).toBe("") fails. (9) Test is reported as broken despite the fix being correct.
🔬 also observed by coderabbitai
There was a problem hiding this comment.
The stripAsanNotice helper and the expect(stripAsanNotice(stderr)).toBe("") assertions at lines 59–60 and 106–107 are still present in the current code, unchanged from when this comment was posted.
stripAsanNotice is s.replace(/^WARNING: ASAN interferes .*\n/m, "") — without the g flag, it removes only the first matching line. On ASAN builds, requestAndNotifyTermination (which calls notifyOne() on the syncWaiter condition) can cause JSC to print multiple ASAN warning lines (e.g. a follow-up "Continue anyway?" notice), leaving stderr non-empty after the one-shot strip and failing the assertion.
The fix is to drop the stderr collection and stripAsanNotice call entirely. The existing expect(stdout).toBe("terminated\n") and expect(exitCode).toBe(0) assertions are sufficient regression signals — a hang produces a test timeout and a crash produces a non-zero exit code. This matches the established repo pattern for test/regression/issue/*.test.ts (per the coderabbitai learning on PR #28694).
The previous attempt to wake workers parked in `Atomics.wait` called `VM::notifyNeedTermination()` from the parent thread, which starts `VMTraps::SignalSender` on a background thread. SignalSender then repeatedly delivers POSIX signals to the worker thread at 1ms intervals until the `NeedTermination` trap bit is cleared — and the bit is only cleared from inside `VMTraps::handleTraps()` running on the worker's own thread at a JS safepoint. When the worker wakes from `Atomics.wait` via the termination-exception path, `atomicsWaitImpl` throws, JSC unwinds straight back to Bun's `spin()` loop, and then `exitAndDeinit()` / `bun.exitThread()` runs without re-entering a JS safepoint. The trap bit stays set after `bun.exitThread()`, SignalSender keeps sending signals, and the worker's pthread ID is recycled for a new thread — which then takes a SIGUSR2 it has no handler for and crashes. This manifested on CI as SIGILL and segfaults at low addresses in worker_destruction.test.ts, broadcast-channel-worker-gc.test.ts, and the http2 worker-terminate regression tests. Fix: skip `notifyNeedTermination` and instead wake the worker by signalling `vm.syncWaiter()->condition()` directly after setting `hasTerminationRequest`. This matches the wake primitive the SignalSender itself uses, doesn't start a background thread, and is race-free because `setHasTerminationRequest` runs before the notify and `waitSyncImpl`'s first predicate check inside `list->lock` observes the flag even when the worker hasn't parked yet.
After `notifyNeedTermination` sets `hasTerminationRequest` on the
child VM, the worker's `exitAndDeinit()` path runs `vm.onExit()`
which eventually dispatches `process.on("exit", ...)` via
`BunProcess.dispatchExitInternal`. That function short-circuits when
`vm.hasTerminationRequest()` is true, so exit handlers would be
silently skipped — and any JS invoked from the shutdown path would
re-throw a termination exception.
Clear the termination state right before `vm.onExit()` runs. By the
time we reach `exitAndDeinit`, the flag has already done its job
(waking the worker from `Atomics.wait`) and the thread is committed
to exiting via `bun.exitThread()` below, so dropping the flag is
safe.
|
Leaving this at 506c71b for now. The core #29173 hang is fixed — tinypool
Fix direction for (2): don't use |
|
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