Public bug reported:

dmesg shows attempts to mount disks that are part of zpools individually. The 
main part is already mounted as part of the pool. It seems to be trying to 
mount the reserved partitions.
I am unsure what package this should belong to. mountall looked to be the most 
accurate but it could be completely wrong.

[10391.115002] EXT4-fs (sda9): VFS: Can't find ext4 filesystem
[10391.116616] EXT4-fs (sda9): VFS: Can't find ext4 filesystem
[10391.118214] EXT4-fs (sda9): VFS: Can't find ext4 filesystem
[10391.119825] FAT-fs (sda9): bogus number of reserved sectors
[10391.119854] FAT-fs (sda9): Can't find a valid FAT filesystem
[10391.128567] XFS (sda9): Invalid superblock magic number
[10391.131729] FAT-fs (sda9): bogus number of reserved sectors
[10391.131760] FAT-fs (sda9): Can't find a valid FAT filesystem
[10391.136291] VFS: Can't find a Minix filesystem V1 | V2 | V3 on device sda9.
[10391.152460] hfsplus: unable to find HFS+ superblock
[10391.154171] qnx4: no qnx4 filesystem (no root dir).
[10391.155637] ufs: You didn't specify the type of your ufs filesystem

               mount -t ufs -o
ufstype=sun|sunx86|44bsd|ufs2|5xbsd|old|hp|nextstep|nextstep-cd|openstep
...

               >>>WARNING<<< Wrong ufstype may corrupt your filesystem, default 
is ufstype=old
[10391.155981] ufs: ufs_fill_super(): bad magic number
[10391.157549] hfs: can't find a HFS filesystem on dev soda

kim@ra:~$ sudo fdisk -l /dev/sda
Disk /dev/sda: 3.7 TiB, 4000787030016 bytes, 7814037168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: gpt
Disk identifier: 12539B9F-167A-7A41-9CBE-DB553870C53A

Device          Start        End    Sectors  Size Type
/dev/sda1        2048 7814019071 7814017024  3.7T Solaris /usr & Apple ZFS
/dev/sda9  7814019072 7814035455      16384    8M Solaris reserved 1

kim@ra:~$ lsb_release -rd
Description:    Ubuntu Xenial Xerus (development branch)
Release:        16.04

** Affects: mountall (Ubuntu)
     Importance: Undecided
         Status: New

** Attachment added: "Contents of dmesg"
   https://bugs.launchpad.net/bugs/1559915/+attachment/4606208/+files/dmesg.txt

** Description changed:

- dmesg shows attempts to mount disks that are part of zpools
- individually. They are already mounted as part of the zpool.
+ dmesg shows attempts to mount disks that are part of zpools individually. 
They are already mounted as part of the pool.
+ I am unsure what package this should belong to. mountall looked to be the 
most accurate but it could be completely wrong.
  
  
  [10391.115002] EXT4-fs (sda9): VFS: Can't find ext4 filesystem
  [10391.116616] EXT4-fs (sda9): VFS: Can't find ext4 filesystem
  [10391.118214] EXT4-fs (sda9): VFS: Can't find ext4 filesystem
  [10391.119825] FAT-fs (sda9): bogus number of reserved sectors
  [10391.119854] FAT-fs (sda9): Can't find a valid FAT filesystem
  [10391.128567] XFS (sda9): Invalid superblock magic number
  [10391.131729] FAT-fs (sda9): bogus number of reserved sectors
  [10391.131760] FAT-fs (sda9): Can't find a valid FAT filesystem
  [10391.136291] VFS: Can't find a Minix filesystem V1 | V2 | V3 on device sda9.
  [10391.152460] hfsplus: unable to find HFS+ superblock
  [10391.154171] qnx4: no qnx4 filesystem (no root dir).
  [10391.155637] ufs: You didn't specify the type of your ufs filesystem
  
-                mount -t ufs -o
+                mount -t ufs -o
  ufstype=sun|sunx86|44bsd|ufs2|5xbsd|old|hp|nextstep|nextstep-cd|openstep
  ...
  
-                >>>WARNING<<< Wrong ufstype may corrupt your filesystem, 
default is ufstype=old
+                >>>WARNING<<< Wrong ufstype may corrupt your filesystem, 
default is ufstype=old
  [10391.155981] ufs: ufs_fill_super(): bad magic number
  [10391.157549] hfs: can't find a HFS filesystem on dev sda9

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https://bugs.launchpad.net/bugs/1559915

Title:
  System appears to try to mount individual ZFS disks when part of zpool

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