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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 How to execute php script using drush?