Memory Leak in openFile() with uv Driver

[Fneufneu]

Hi,

I have a memory leak in my daemon and i think i found the cause: openFile().
Memory does not go up if i replace it with a new WritableResourceStream(\fopen($filename, 'w'));

Code to reproduce (taken from a amphp/socket issue)

<?php

use Revolt\EventLoop;
use Amp\File\File;
use function Amp\File\openFile;
use function Amp\Socket\listen;

require_once(__DIR__ . '/vendor/autoload.php');

EventLoop::repeat(10, function () {
    echo 'Counters: '. Test::$constructInc . ' - ' . Test::$destructInc . PHP_EOL;
    echo 'Memory: ' . round(memory_get_usage() / 1024, 2) . ' KB' . PHP_EOL;
});

Amp\async(function () {
    $uri = "tcp://127.0.0.1:1337";
    $server = listen($uri);
    $clients = new \WeakMap();
    while ($socket = $server->accept()) {
        $obj = new Test($socket);
        $clients[$obj] = true;
        EventLoop::queue($obj->run(...));
    }
})->await();

class Test
{
    public static int $constructInc = 0;
    public static int $destructInc = 0;
    public string $content;
    public ?File $file = null;

    public function __construct(private \Amp\Socket\ResourceSocket $socket)
    {
        $this->content = str_repeat('a', 2048);
        self::$constructInc++;
    }

    public function __destruct()
    {
        self::$destructInc++;
    }

    public function run()
    {
        $this->file = openFile(rtrim(sys_get_temp_dir(), '/') . '/leaktest-' . mt_rand(), 'w');
        Amp\delay(mt_rand(0, 3));
        $this->socket->write('bye');
        $this->socket->end();
        $this->file->close();
    }
}

Will show:

Counters: 0 - 0
Memory: 1313.06 KB
Counters: 4 - 3
Memory: 1638.35 KB
Counters: 4 - 3
Memory: 1638.35 KB
Counters: 13 - 12
Memory: 1645.09 KB
Counters: 22 - 18
Memory: 1768.31 KB
Counters: 43 - 42
Memory: 1670.28 KB
Counters: 43 - 42
Memory: 1670.28 KB
Counters: 43 - 42
Memory: 1670.28 KB
Counters: 134 - 117
Memory: 2259.37 KB
Counters: 231 - 219
Memory: 2141.72 KB
Counters: 267 - 266
Memory: 1791.28 KB
Counters: 267 - 266
Memory: 1791.28 KB
Counters: 347 - 328
Memory: 2424.6 KB
Counters: 425 - 422
Memory: 1946.41 KB
Counters: 425 - 424
Memory: 1860.41 KB
Counters: 425 - 424
Memory: 1860.41 KB
Counters: 425 - 424
Memory: 1860.41 KB

You can spam connections with: while : ; do (echo | nc localhost 1337 ) & sleep .1 ; done

The memory will grow up until 128M default max limit and the process will crash.