I am now self-learning mit6.828, this course is about studying operating system xv6. This system boot with initiating memory system, user environment system, trap system ,multiprocessors and a file system(a user environment that manipulate 3GB disk space). After booting up, it starts the shell interface. My system should have no problems until here as I past all the tests in previous labs and this lab except for the last test int lab5 which test the pipe function.