Well, I haven't solved everything yet, but I do feel better now that I realize 
that it was setting moutpoint=none that caused the zfs send/recv to hang.  
Allowing the default mountpoint setting fixed that problem.  I'm now trying 
with moutpoint=legacy, because I'd really rather leave it unmounted, especially 
during the backup itself, to prevent changes happening while the incrementals 
are copying over, and also in the end to hopefully let me avoid using -F.

The incrementals (copying all the snapshots beyond the first one copied) are 
really slow, however.  Is there anything that can be done to speed that up?  
I'm using compression (gzip-1) on the source filesystem.  I wanted the backup 
to retain the same compression.  Can ZFS copy the compressed version over to 
the backup, or does it really have to uncompress it and recompress it?  That 
takes time and lots of CPU cycles.  I'm dealing with highly compressible data 
(at least 6.5:1).
--
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