This bug was fixed in the package zfs-linux - 0.7.5-1ubuntu11
--------------- zfs-linux (0.7.5-1ubuntu11) bionic; urgency=medium
* Fix mmap'd libaio read on non-prefaulted page deadlock (LP: #1754584) - ensure page is pre-faulted in to avoid deadlock
-- Colin Ian King <email address hidden> Mon, 26 Mar 2018 09:29:23 +0100
This bug was fixed in the package zfs-linux - 0.7.5-1ubuntu11
---------------
zfs-linux (0.7.5-1ubuntu11) bionic; urgency=medium
* Fix mmap'd libaio read on non-prefaulted page deadlock (LP: #1754584)
- ensure page is pre-faulted in to avoid deadlock
-- Colin Ian King <email address hidden> Mon, 26 Mar 2018 09:29:23 +0100