ZFS: sharenfs and "zdb no such file" errors

I had a previously discussed zpool related error on my susytem:
(http://freebsd.1045724.n5.nabble.com/zpool-requires-re-import-on-reboot-td5861930.html#a5862468).
This may be related.

Now a different but equally odd error: On one of the pools with the import
problem (poolname=da), I had:
zfs set sharenfs="-network=192.168.2.0/24" da/data/amd64
When I start nfsd + mountd, TTY0 shows this error:
bad exports list line: /mnt/data/amd64
bad exports list line: /mnt/amd64

I can only assume that I had the da zpool mounted as altroot=/mnt at some
point in its history. After I 
zfs set sharenfs=off da/data/amd64 
for debugging, the error persisted for some time then was gone when I first
tried; now it persists even after a pool scrub. ZDB shows nothing odd with
the "-Cl /dev/ada1p2" flag, but,
zdb -d da/data/amd64
zdb: can't open 'da/data/amd64': No such file or directory
I have same error for all pool-type commands. "# zdb -C da" for example.

Regards




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FreeBSD-11-current_amd64_root-on-zfs_RadeonKMS
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