Maximum function nesting level reached on (new Swoole\Coroutine\MySQL())->connect()

[kfreiman]

<?php
use Swoole\Http\Server;
$server = new Server('127.0.0.1', 9501);
var_dump(phpversion());
var_dump(SWOOLE_VERSION);

$server->on('Request', function($request, $response) use ($server) {
    $swoole_mysql = new Swoole\Coroutine\MySQL();
    $connected = $swoole_mysql->connect([
        'host' => '127.0.0.1',
        'user' => 'myuser',
        'password' => 'mypass',
        'database' => 'test',
    ]);

    if (!$connected) {
        echo 'connection failed!';
    }
    $res = $swoole_mysql->query('select sleep(1)');
});

$server->start();

Extention configured by

./configure --with-php-config=/usr/bin/php-config --enable-coroutine 

Result of executing php ./http_server.php:

/home/kirill/sites/swoole/http_server.php:4:
string(22) "7.0.8-0ubuntu0.16.04.3"
/home/kirill/sites/swoole/http_server.php:5:
string(5) "2.0.5"
PHP Fatal error:  Maximum function nesting level of '256' reached, aborting! in /home/kirill/sites/swoole/http_server.php on line 7
PHP Stack trace:
PHP   1. {main}() /home/kirill/sites/swoole/http_server.php:0
PHP   2. Swoole\Http\Server->start() /home/kirill/sites/swoole/http_server.php:22
PHP   3. {closure:/home/kirill/sites/swoole/http_server.php:7-20}() /home/kirill/sites/swoole/http_server.php:0
PHP   4. Swoole\Coroutine\MySQL->connect() /home/kirill/sites/swoole/http_server.php:10
....
PHP 255. {closure:/home/kirill/sites/swoole/http_server.php:7-20}() /home/kirill/sites/swoole/http_server.php:0
PHP 256. Swoole\Coroutine\MySQL->connect() /home/kirill/sites/swoole/http_server.php:10
[2017-02-01 16:32:43 *24120.3]  ERROR   zm_deactivate_swoole (ERROR 503): Fatal error: Maximum function nesting level of '256' reached, aborting! in /home/kirill/sites/swoole/http_server.php on line 7.
[2017-02-01 16:32:43 $24112.0]  WARNING swManager_check_exit_status: worker#3 abnormal exit, status=255, signal=0

Is it bug, or i doing somethung wrong?

[matyhtf]

Have you installed the xdebug extension?
Try turn off xdebug extension.

[kfreiman]

Yes, disabling xdebug (at /etc/php/7.0/mods-available/xdebug.ini in my case) solved this problem. Thanks!