I searched around and at first It looked like a vagrant bug but, it turns out is a bug in ubuntu 16.04 that has not been fixed yet. I’m not sure what flavor you guys use for your host but, I’m using ubuntu 16.x and the VM used for discourse is also 16.04
https://github.com/mitchellh/vagrant/issues/6871
https://github.com/mitchellh/vagrant/issues/7537