top ARC stats are wrong

I would love to have 2 TB of RAM, but alas, I have a paltry 32 GB, and 
only 200 GB of disk used by ZFS:

ARC: 1860M Total, 612G MFU, K MRU, 1921G Anon, 12M Header, 157M Other

NAME         SIZE  ALLOC   FREE
..........   230G   178G  51.7G
..........   298G  12.6G   285G

This is on r366500+84ccaf49083c-c272054.

I'll look into it when I have time, but that won't be soon.

Eric