Hi!
Exception handler threw an object exception: TypeError: Argument 2 passed to stream_set_blocking() must be an instance of int, bool given in /vagrant/mediawiki/includes/libs/redis/RedisConnectionPool.php:233
This one is weird - second arg of stream_set_blocking should be boolean, e.g.: http://php.net/stream_set_blocking
But looking into hhvm source, I find this: https://github.com/facebook/hhvm/pull/7084
Looks like hhvm had a wrong definition of the function.