Nonsense UNKNOWN error when writing large buffers with fs.writev

Version

14.18.1

Platform

Linux ops 5.11.0-1021-gcp #23~20.04.1-Ubuntu SMP Fri Oct 1 19:04:32 UTC 2021 x86_64 x86_64 x86_64 GNU/Linu

Subsystem

fs

What steps will reproduce the bug?

const fs = require("fs");
const fd = fs.openSync("./test.dat", fs.constants.O_WRONLY | fs.constants.O_CREAT, 0o666);
const bufs = [Buffer.alloc(0x7FFFFFFF + 1)];
fs.writevSync(fd, bufs, 0);

This throws

Uncaught Error: UNKNOWN: unknown error, write
    at Object.writevSync (fs.js:749:3) {
  errno: -2147483648,
  syscall: 'write',
  code: 'UNKNOWN'
}

That errno is 0x7fffffff + 1 wrapped around.

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

Always.

What is the expected behavior?

Should either work, since pwritev(2) works (I don't know if it has a limit less than SSIZE_MAX), or report a proper error before making the syscall. I did the latter recently for fs.write in c4e7dca8f30ff89b42e96fb8819558ed518a72dd. It would be nice if large files actually worked, but the best fix for that would require a new libuv function.

What do you see instead?

No response

Additional information

No response

Inizia da fs.writevSync in fs.js e confronta la gestione dei relativi argomenti con la validazione di fs.write a cui fa riferimento il commit c4e7dca8f30ff89b42e96fb8819558ed518a72dd. Riproduci il caso del buffer di grandi dimensioni su Linux, quindi determina se il comportamento definitivo debba rifiutare la richiesta con un errore appropriato prima della syscall oppure supportare il buffer più grande tramite libuv.