This bug was fixed in the package zfs-linux - 0.8.1-1ubuntu14.4
--------------- zfs-linux (0.8.1-1ubuntu14.4) eoan; urgency=medium
* Fix deadlock in 'zfs rollback' (LP: #1847832) - Upstream ZFS fix e7a2fa70c3b0 ("Fix deadlock in 'zfs rollback') minor backport, wiggle and context adjustments.
-- Colin Ian King <email address hidden> Tue, 10 Mar 2020 17:45:23 +0000
This bug was fixed in the package zfs-linux - 0.8.1-1ubuntu14.4
---------------
zfs-linux (0.8.1-1ubuntu14.4) eoan; urgency=medium
* Fix deadlock in 'zfs rollback' (LP: #1847832)
- Upstream ZFS fix e7a2fa70c3b0 ("Fix deadlock in 'zfs rollback')
minor backport, wiggle and context adjustments.
-- Colin Ian King <email address hidden> Tue, 10 Mar 2020 17:45:23 +0000