I did more research, it looks like this tablet has the unaligned access set to cause a bus error in the kernel. I don't have access to the TRM so I don't know if this is tegra-related, or just an asus kernel decision.
I manually changed HAVE_FAST_UNALIGNED to 0, and so far have had no problems, even with optimisations enabled.
There doesn't seem much point in trying to detect this behaviour at run-time (if it's even possible/practical) so perhaps fast_unaligned needs to be an option and not just based on the cpu architecture.
I'm mostly just surprised it happens so rarely, as I would've expected it to pop up a lot.
(I can't confirm this against git head at this time, although the relevant arm bits look the same to me).
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