You can do that by a drush script looking like this:

    $users = entity_load('user');
    foreach ($users as $user) {
            $node = new stdClass();
            $node->type = 'yourContentType';
    		$node->status = 1;
    		$node->uid = $user->uid;
    		$node->title = $user->name;
    		$node->promote = 0;
    		$node->sticky = 0;
    		$node->language = 'en';
    		$node->body = '<p>body</p>';
    		node_save($node);
    }

Here is more info about how to execute it https://drupal.stackexchange.com/questions/9837/how-to-execute-php-script-using-drush#9839