deployer: Deploy freezes

Q	A
Issue Type	Question
Deployer Version	6.0.3
Local Machine OS	macOS 10.13.1 (High Sierra)
Remote Machine OS	Debian Jessie 8.5

Description

Deployer is stucked during deploy:prepare command. I have tried multiplexing and forwardAgent combination true or false with no effect.

Steps to reproduce

dep deploy

Content of deploy.php

<?php
namespace Deployer;

require 'recipe/symfony3.php';

// Project name
set('application', 'hourglass');

// Project repository
set('repository', 'git@gitlab.com:xxx/hourglass.git');

// [Optional] Allocate tty for git clone. Default value is false.
set('git_tty', true); 

// Shared files/dirs between deploys 
add('shared_files', []);
add('shared_dirs', []);

// Writable dirs by web server 
add('writable_dirs', []);

// Hosts
host('access.snackhost.eu')
    ->user('xxx')
    ->configFile('~/.ssh/config')
    ->identityFile('~/.ssh/id_rsa')
//    ->multiplexing(true)
//    ->forwardAgent(false)
    ->port(22)
    ->set('deploy_path', '/home/xxx/deploys/hourglass');
    
// Tasks

task('build', function () {
    run('cd {{release_path}} && build');
});

// [Optional] if deploy fails automatically unlock.
after('deploy:failed', 'deploy:unlock');

// Migrate database before symlink new release.

before('deploy:symlink', 'database:migrate');

Output log

dep deploy -vvv
[localhost] > export SYMFONY_ENV='prod'; git rev-parse --abbrev-ref HEAD
[localhost] < master
✈︎ Deploying master on access.snackhost.eu
• done on [access.snackhost.eu]
➤ Executing task deploy:prepare
[access.snackhost.eu] > export SYMFONY_ENV='prod'; echo $0
[access.snackhost.eu] < bash