zfs upgrade "gpart: /dev/da4p1: not enough space"

[Russell L. Carter]

Greetings,

amd64 11/stable

So I'm on the last machine of a zpool upgrade everybody, and on the
very last, and most important pool, I zpool upgraded and then
went to finish the boot zpool and what did I see:

root at terpsichore> gpart bootcode -b /boot/pmbr -p /boot/gptzfsboot -i 1  da3
gpart: /dev/da3p1: not enough space

So... what do I do now?  It's happy staying up for days, but... will
I have to reinstall the system to make da3p1 big enough?

Thanks,
Russell