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SubjectRe: more devfs fun (Piled Higher and Deeper)
... and one more - devfs_unregister() on a directory happening when
mknod() in that directory sleeps in create_entry() (on kmalloc()).

Do you ever read your own code? It's not like this stuff was hard
to find - I'm just poking into random places and every damn one
contains a hole. Sigh...

Oh, BTW - here's another one: think what happens if tree-walking in
unregister() steps on the entry we are currently removing in
devfs_unlink().

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