Regression in ZFS on LInux 0.7.7
ZFS on Linux has a regression, which will be fixed in 0.7.8. They advise to revert to 0.7.6.
That post does mention that most likely it only affects systems with coreutils-8.22 or older, which is not the case for edge.
This affects edge only.
(from redmine: issue id 8779, created on 2018-04-10, closed on 2018-04-10)