SonataUserBundle/Resources/config/twig.xml

<?xml version="1.0" encoding="UTF-8" ?>

<container xmlns="http://symfony.com/schema/dic/services"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://symfony.com/schema/dic/services http://symfony.com/schema/dic/services/services-1.0.xsd">

    <services>
        <service id="sonata.user.twig.global" class="Sonata\UserBundle\Twig\GlobalVariables" >
            <argument type="service" id="service_container" />
        </service>
    </services>
</container>