Ubuntu was never affected. The regression started in 0.7.7 and Ubuntu is on 0.7.5. HEAD was affected until earlier today when the patch was reverted.
I am not sure if the bad patch was ported to the other OpenZFS platforms.
I am not sure if the bad patch was ported to the other OpenZFS platforms.
[2018-03-09] Accepted zfs-linux 0.7.6-1~bpo9+1 (source amd64 all) into stretch-backports (Aron Xu)