You can't make a valid recursive tree without a pre-image attack against SHA1. However `git` doesn't actually verify the SHA1s when it does most commands. If yo

You can't make a valid recursive tree without a pre-image attack against SHA1. However `git` doesn't actually verify the SHA1s when it does most commands. If you make a recursive tree and try `git status` it will segfault because the directory walking gets stuck in infinite recursion.