如何在virtualbox中调试内核加载和内部加载

I have cloned the linux kernel repo on my arch hosted machine (host is ubuntu 16.04). Two weeks ago I was able to boot into the new kernel (it was 4.11.rc06 back then), then I did git pull and recompiled everything and it just hangs after "loading initial ramdisk image...". I have cloned the linux kernel repo on my arch