ZFS v28: panic: zfs accessing past end of object

[Rich]

My experimental v28 server panicked today when I was testing it by
pushing a backup of my laptop to it over NFS with rsync. Dedup was
enabled on the pool, NFS sharing done via sharenfs property, nothing
else of interest that I'm aware of was on.

Running on r212074 with the original v28 patch, on an amd64 system.
I've attached core.txt.0, please let me know what else  I can provide.

- Rich
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