You're saying we wouldn't need fault isolation/tolerance/recovery if we didn't have faults. That's true, but unless someone comes up with a way to prevent all faults, it's not a useful statement. Barring that, schemes like this are at least interesting, and I'm not sure why parts of it aren't in place. In particular, if someone has a way to make most of the core kernel's memory read-only to drivers at low cost, I'm all for it.
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