Segfaults with [await] using within node core

@Qard

js_explicit_resource_management is still a flagged feature in V8. We cannot depend on it in core.

Encountering [await] using in core will segfault if running in an environment without js_shipping features.

> out/Release/node --no-js-explicit-resource-management --eval 'diagnostics_channel.tracingChannel("foo").traceSync(() => {})'
[1]    160425 segmentation fault (core dumped)  out/Release/node --no-js-explicit-resource-management --eval

(This only applies to core, not the test suite.)

We should convert cases added by diagnostics_channel: add BoundedChannel and scopes #61680 from

{
  using _ = blah;
  ...
}

to

{
  const _ = blah;
  try {
    ...
  } finally {
    _[Symbol.dispose]();
  }
}

(cc @Qard)

I'll add an eslint rule to cover it.
Should we be doing a GHA CI run with --no-js-shipping in the global test options?

So we can expose the sync/async dispose methods on core types, but we can't actually use the using syntax in core yet? We could perhaps just rewrite those to manual invocations of the dispose methods for now, just to keep the semantics until the syntax is fully usable.

So we can expose the sync/async dispose methods on core types, but we can't actually use the using syntax in core yet?

Pretty much!

@Renegade334

Hi @Renegade334! I saw that PR #64231 adds the lint rule but the JS linter is currently failing, presumably because the existing using statements in lib/diagnostics_channel.js haven't been refactored yet. I would love to tackle this and convert them to try...finally blocks. Can I pick this up?

diagnostics_channel: replace using with try-finally

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Segfaults with `[await] using` within node core #64230

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Segfaults with [await] using within node core #64230

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Qard commented on Jul 1, 2026

Renegade334 commented on Jul 1, 2026

ayush23chaudhary commented on Jul 1, 2026

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Segfaults with `[await] using` within node core #64230