Public bug reported:

unattended-upgrades upgraded zfs today to, and since a 
subsequent reboot, the zfs filesystem appears empty. I've verified that there 
was not a directory named after the zfs mount before the mount, and zfs shows 
there is something in the filesystem - see below, but when mounted, no files 
are visible.
root@mahrez:/var/log/apt# zfs list -t all -o space
NAME                                  AVAIL   USED  USEDSNAP  USEDDS  
mahrez                                53.5T   332M      201K    457K            
  0       332M
root@mahrez:/var/log/apt# df /mahrez
Filesystem       1K-blocks  Used   Available Use% Mounted on
mahrez         57443602688   512 57443602176   1% /mahrez
There are no errors from zfs in the logs, no disk problems, and it has been 
scrubbed with no errors.
I've been trying to revert to an older zfs version to test if the update is 
definitely the cause, but the packages don't seem to be available. I've booted 
into 3 older kernels to see if that helped, but no.
The logs from the update are below. After the update, a user reported they were 
getting "operating not permitted" when trying to read their files on the fs. I 
verified this was the case, and rebooted to see if that would help, and after 
that, no files were listed at all. I've got 4 other machines running older zfs 
versions which are fine. I've stopped updates on them.
Start-Date: 2018-03-02  11:05:42
Commandline: /usr/bin/unattended-upgrade
Upgrade: gnome-accessibility-themes:amd64 (3.18.0-2ubuntu1, 3.18.0-2ubuntu2), 
bamfdaemon:amd64 (0.5.3~bzr0+16.04.20160824-0ubuntu1, 
0.5.3~bzr0+16.04.20180209-0ubuntu1), libsnmp-base:amd64 (5.7.3+dfsg-1ubuntu4, 
5.7.3+dfsg-1ubuntu4.1), isc-dhcp-common:amd64 (4.3.3-5ubuntu12.7, 
4.3.3-5ubuntu12.9), zfs-zed:amd64 (,, 
libdfu1:amd64 (0.7.0-0ubuntu4.3, 0.8.3-0ubuntu2), zfsutils-linux:amd64 
(,, libbamf3-2:amd64 
(0.5.3~bzr0+16.04.20160824-0ubuntu1, 0.5.3~bzr0+16.04.20180209-0ubuntu1), 
libsnmp30:amd64 (5.7.3+dfsg-1ubuntu4, 5.7.3+dfsg-1ubuntu4.1), 
libzfs2linux:amd64 (,, libfwupd1:amd64 
(0.7.0-0ubuntu4.3, 0.8.3-0ubuntu2), libzpool2linux:amd64 (,, fwupd:amd64 (0.7.0-0ubuntu4.3, 0.8.3-0ubuntu2), 
linux-firmware:amd64 (1.157.16, 1.157.17), libnvpair1linux:amd64 
(,, libuutil1linux:amd64 
(,, zfs-doc:amd64 (,, isc-dhcp-client:amd64 (4.3.3-5ubuntu12.7, 4.3.3-5ubuntu12.9)

** Affects: zfs-linux (Ubuntu)
     Importance: Undecided
         Status: New

** Summary changed:

- zfs
+ zfs - filesystem seems empty after package upgrade

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  zfs - filesystem seems empty after package upgrade

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