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stream: pipeTo with preventCancel can hit ERR_INTERNAL_ASSERTION if destination errors before deferred write #63732
Description
Version
v24.16.0
Platform
Linux n37-114-192 5.15.120.bsk.3-amd64 #5.15.120.bsk.3 SMP Debian 5.15.120.bsk.3 Fri Dec 8 12:41:09 UTC x86_64 GNU/Linux
Subsystem
stream
What steps will reproduce the bug?
const { ReadableStream, WritableStream } = require("node:stream/web");
let sourceController;
let destController;
const source = new ReadableStream({
start(controller) {
sourceController = controller;
},
});
const dest = new WritableStream({
start(controller) {
destController = controller;
},
write() {},
});
source.pipeTo(dest, { preventCancel: true }).catch((err) => {
console.log("pipeTo rejected:", err.name, err.message);
});
setImmediate(() => {
destController.error(new Error("destination errored"));
sourceController.enqueue("chunk");
});How often does it reproduce? Is there a required condition?
Always.
What is the expected behavior? Why is that the expected behavior?
pipeTo() should reject with the destination error, like v24.14.1 does:
pipeTo rejected: Error destination errored
What do you see instead?
node:internal/assert:11
throw new ERR_INTERNAL_ASSERTION(message);
^
Error [ERR_INTERNAL_ASSERTION]: This is caused by either a bug in Node.js or incorrect usage of Node.js internals.
Please open an issue with this stack trace at https://github.com/nodejs/node/issues
at assert (node:internal/assert:11:11)
at writableStreamDefaultWriterWrite (node:internal/webstreams/writablestream:982:3)
at node:internal/webstreams/readablestream:1677:33
at process.processTicksAndRejections (node:internal/process/task_queues:104:5) {
code: 'ERR_INTERNAL_ASSERTION'
}
Node.js v24.16.0
Additional information
The error starts to occur in v24.15.0. This lines up strongly with #61800.
Activity
github-actions commentedon Sep 2, 2026
This issue has been marked as stale due to 90 days of inactivity.
It will be automatically closed in 30 days if no further activity occurs. If this is still relevant, please leave a comment or update it to keep it open.
stream: fix pipeTo assert when writer is released during microtask
colinaaa commentedon Sep 4, 2026
bump. Updated the PR #63733