This bug was fixed in the package zfs-linux - 0.6.5.4-0ubuntu5
--------------- zfs-linux (0.6.5.4-0ubuntu5) xenial; urgency=medium
* cherry-picked c352ec27d5c5ecea8f6af066258dfd106085eaac ('Illumos 6370 - ZFS send fails to transmit some holes') (LP: #1557151)
-- Tim Gardner <email address hidden> Mon, 14 Mar 2016 16:42:44 -0600
This bug was fixed in the package zfs-linux - 0.6.5.4-0ubuntu5
---------------
zfs-linux (0.6.5.4-0ubuntu5) xenial; urgency=medium
* cherry-picked c352ec27d5c5ece a8f6af066258dfd 106085eaac ('Illumos 6370 -
ZFS send fails to transmit some holes')
(LP: #1557151)
-- Tim Gardner <email address hidden> Mon, 14 Mar 2016 16:42:44 -0600