I've tracked down the cause. It was my backup copy of the zone ZFS tree
on another pool:
backup/zoneRoot 1.64G 89.3G 26K /backup/zoneRoot
backup/zoneRoot/svn 439M 89.3G 24K
backup/zoneRoot/svn/ROOT 439M 89.3G 21K legacy
backup/zoneRoot/svn/ROOT/zbe 439M 89.3G 437M legacy
Even though the mountpoints and ZFS names differ, their presence appears
to have been causing confusion. When I export the backup pool, all
boots and creates work.
So my problem is solved, but there appears to be an issue with keeping
backup copies on the same machine.
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