I upgraded my Macbook (running x86-64) to Ibex using the upgrade tool. When I boot, the 2.6.27-7 kernel panics:
That's:
PANIC: early execption 0e rip 10:ffffffff00224601 error 0 cr2 ffffffffff5fc0f0
Fortunately, I can still boot in 2.6.24-21... but this would turn out to be a pretty crappy upgrade experience for any non-technical users.
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