Description:
------------
PHP-Version: 7.1.6-2+0~20170614060700.1+jessie~1.gbp831871

I open multiple ssh2 connections in a loop. In my case the server itself is always the same, but the username/password changes. So I cannot say if this error happens if the server changes as well

Basically each file should be put on a different account
With opcache enabled, every file is uploaded on the first connection, even though it should always be a new one. The streams meta data even shows a new resource id for each connection

This does not happen in PHP 5.6 or with opcache disabled

Test script:
---------------
<?php

$configs = [
    ['host', 'username', 'password', '/path/'],
    // ...
];

while (true) {
    $index = array_rand($configs);
    list($host, $username, $password, $path) = $configs[$index];
    $port = 22;
    $connection = ssh2_connect($host, 22);
    if ($connection === false) {
        continue;
    }
    if (!ssh2_auth_password($connection, $username, $password)) {
        continue;
    }
    $sftp = ssh2_sftp($connection);
    $handle = @fopen('ssh2.sftp://' . intval($sftp) . $path . $username, 'w+');
    if ($handle === false) {
        continue;
    }
    print_r(stream_get_meta_data($handle));
    fclose($handle);
}