`net.Socket({ fd })` can abort the Node.js process when iterating invalid file descriptors

[kevgeoleo]

Version

24.13.1

Platform

Linux KContainer 6.12.86+deb13-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.12.86-1 (2026-05-08) x86_64 x86_64 x86_64 GNU/Linux

Subsystem

net

What steps will reproduce the bug?

Hi,

I found a case where creating net.Socket instances with arbitrary file descriptors can abort the entire Node.js process.

const net = require('net');

let fd = 3;
while (fd < 1000) {
  try {
    const stream = new net.Socket({
      fd: fd,
      readable: false,
      writable: true
    });
    stream.on('error', function () {});
    stream.write('might crash');
  } catch (e) {
    // ignore and continue to next fd
    console.log('caught')
  }
  fd += 1;
}

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

Reproduces consistently on my system.

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

Invalid or unsupported file descriptors passed to net.Socket({ fd }) should result in ordinary JS exceptions or socket errors, not process abort.

What do you see instead?

Some file descriptors are handled normally and throw JS exceptions that are caught successfully, but eventually Node aborts the process:

root@KContainer:~/git/run/cerebras/node/OPENAI/gpt5.1/filter/batch_3/cross_runtime/temp_deno/3604# node repro.cjs caught caught caught caught 
caught 
caught 
.... 
caught 
caught 
caught 
caught 
caught 
caught 
caught 
caught
Aborted

The abort bypasses JS exception handling entirely.

Additional information

No response