[fnj]

> One theory is that Canonical has essentially forced Oracle to decide whether it wants to crack down on inclusion of CDDL-licensed code being shipped with Ubuntu's stock kernel, so Red Hat may be waiting to see if Oracle sweeps in or not before following suit.

That is not a "theory" that anyone who understands the basics of the licenses adheres to. The possible threat is that linux' GPL could attack ZFS; not the other way round. There is nothing in the CDDL in the way of using ZFS in linux.