Comment 11 for bug 1849665

Installed the new zfsutils + zfs dkms to sanity check the kernel driver part of the fix:

dmesg | grep ZFS
[ 22.420188] ZFS: Loaded module v0.8.1-1ubuntu14.1, ZFS pool version 5000, ZFS filesystem version 5

And now the test:

root@eoan-amd64-uefi:~# mkdir /zfs-test
root@eoan-amd64-uefi:~# cd /zfs-test
root@eoan-amd64-uefi:/zfs-test# truncate -s 10G file.img
root@eoan-amd64-uefi:/zfs-test# zpool create -o ashift=12 -O acltype=posixacl -O compression=lz4 -O xattr=sa -O normalization=formD -O dnodesize=auto tank $(pwd)/file.img
root@eoan-amd64-uefi:/zfs-test# zfs create tank/d1 -o encryption=on -o keyformat=passphrase
Enter passphrase:
Re-enter passphrase:
root@eoan-amd64-uefi:/zfs-test# dd if=/dev/urandom bs=4k of=/tank/d1/somedata.bin count=10240
10240+0 records in
10240+0 records out
41943040 bytes (42 MB, 40 MiB) copied, 0.319657 s, 131 MB/s
root@eoan-amd64-uefi:/zfs-test# zfs snapshot tank/d1@s1
root@eoan-amd64-uefi:/zfs-test# dd if=/dev/urandom bs=4k of=/tank/d1/somedata2.bin count=10240
10240+0 records in
10240+0 records out
41943040 bytes (42 MB, 40 MiB) copied, 0.312195 s, 134 MB/s
root@eoan-amd64-uefi:/zfs-test# zfs diff tank/d1@s1 tank/d1
M /tank/d1/
+ /tank/d1/somedata2.bin

The zfsutils + dkms package has the fix. Once this lands we can then sync this into the next kernel release for the complete fix.