Kernel Panic if function implementing Scheme panics

So I've been playing around with schemes, and I was being able to cause a kernel panic from userspace, basically...

Anyway, I had some faulty logic that was causing my open to panic. Here's the stripped down version on how to reproduce:

impl Scheme for MyScheme {
    fn open(&self, path: &[u8], uid: u32, gid: u32) -> Result<usize> {
        panic!("Hi!");
        Ok(0) // <- Unreachable???
    }
}

Whip that up into a daemon that looks like the main.rs here and you get a nce kernel panic whenever you try to cat anything from your scheme...

My guess is that it's an issue with the root scheme not being able to understand a read not being followed by a write, but I'm not particularly sure on that.