memory leak with worker thread and parentPort.postMessage

Version

v17.4.0

Platform

Microsoft Windows NT 10.0.22000.0 x64

Subsystem

No response

What steps will reproduce the bug?

node test.js

• test.js :

const {
    Worker, isMainThread, parentPort
} = require('worker_threads');

if (isMainThread) {
    function parseJSAsync(script) {
        return new Promise((resolve, reject) => {
            const worker = new Worker(__filename);
            //worker.on('message', resolve);
            worker.on('message', (i)=>{
                //console.log('plop' + i);
            });
            worker.on('error', reject);
            worker.on('exit', (code) => {
                if (code !== 0)
                    reject(new Error(`Worker stopped with exit code ${code}`));
            });
        });
    };
    parseJSAsync()// no leak if called only once
    parseJSAsync()// leak appears if called twice or more
    parseJSAsync()
} else {
    let i = 0;
    while (i<1000000000000) {
        parentPort.postMessage(i);// no leak if commented
        i++;
    }
}

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

Always, if more than 1 worker is instantiated and parentPort.postMessage is used.

What is the expected behavior?

constant memory usage

What do you see instead?

a linear increase of memory usage over time (up to 16Gio+ in less than 1min)

Additional information

No response

Inizia eseguendo il test.js della issue con node test.js e confrontando l’uso della memoria quando più worker di worker_threads chiamano parentPort.postMessage. Traccia i worker e la gestione dei messaggi coinvolti; il lavoro è completo quando worker ripetuti mantengono costante l’uso della memoria invece di farlo crescere linearmente.