stream/iter: pull() with AbortSignal hangs while awaiting source next()

[trivikr]

Version

26.2.0

Platform

macOS 26.5.0

Subsystem

stream

What steps will reproduce the bug?

import { pull } from 'node:stream/iter';

const source = {
  async *[Symbol.asyncIterator]() {
    await new Promise(() => {});
  },
};

const ac = new AbortController();
const iterator = pull(source, { signal: ac.signal })[Symbol.asyncIterator]();

const next = iterator.next().then(
  () => 'settled: fulfilled',
  (err) => `settled: rejected with ${err.name}: ${err.message}`,
);

ac.abort();

console.log(await Promise.race([
  next,
  new Promise((resolve) => setTimeout(resolve, 100, 'still pending after abort')),
]));

How often does it reproduce? Is there a required condition?

Always

What is the expected behavior? Why is that the expected behavior?

settled: rejected with AbortError: This operation was aborted

Passing { signal } to pull() should let them stop the pipeline even when the source is idle or waiting for more data.

What do you see instead?

still pending after abort

The no-transform path remains stuck until the source eventually yields, so aborting does not actually abort the pending read.

Additional information

No response