How to stop build that is STUCK because of --prod flag

Hi, we are facing the problem that our builds is stuck when we using --prod flag, but the real problem is that now it has stuck not on our cli, but inside ionicframework build tool VM. How can we cancel those builds(cause now we have two builds there that’s we try to test, one is stuck right now and the second is in line…waiting to be stuck same as his friend)