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[Rick Foos <rickfoosusa@xxxxxxxxx>]

Public bug reported:

Ubuntu 15.04
mount:
  Installed: 2.25.2-4ubuntu2
  Candidate: 2.25.2-4ubuntu2
  Version table:
 *** 2.25.2-4ubuntu2 0
        500 http://us.archive.ubuntu.com/ubuntu/ vivid/main amd64 Packages
        100 /var/lib/dpkg/status

System has LVM on SSD standard install ext4 filesystem. (/dev/mapper/ubuntu--vg-root)
mdadm RAID5 3 disks, btrfs filesystem (/dev/md127p1)
RAID5 is mounted at /mnt/raid at boot.
---
Bind mounts only display the device mount, not the from directory.
The mount works, but the mtab entry is incorrect.

# From LVM device, to LVM device.
mount -o bind /home/rfoos /srv/nfs4/homes
# From Raid device, to LVM device
mount -o bind /mnt/raid/var/lib/libvirt /var/lib/libvirt
# With corrected fstab entries (below) mount -a does work
mount -a

--- /etc/mtab entries
/dev/mapper/ubuntu--vg-root /srv/nfs4/homes ext4 rw,relatime,errors=remount-ro,data=ordered 0 0
/dev/md127p1 /var/lib/libvirt btrfs rw,nosuid,nodev,relatime,space_cache 0 0
/dev/md127p1 /srv/nfs4/share btrfs rw,nosuid,nodev,relatime,space_cache 0 0

--- mount list of mounts
/dev/md127p1 on /mnt/raid type btrfs (rw,nosuid,nodev,relatime,space_cache)
/dev/md127p1 on /var/lib/libvirt type btrfs (rw,nosuid,nodev,relatime,space_cache)
/dev/mapper/ubuntu--vg-root on /srv/nfs4/homes type ext4 (rw,relatime,errors=remount-ro,data=ordered)

--- corrected fstab entries.
# mount raid device
/dev/md127p1 /mnt/raid btrfs rw,nosuid,nodev,relatime,space_cache 0 0
# corrected entries
/mnt/raid/var/lib/libvirt /var/lib/libvirt none bind 0 0
/home/rfoos /srv/nfs4/homes none bind 0 0

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

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https://bugs.launchpad.net/bugs/1474958

Title:
  bind mount produces incorrect entry in mtab

Status in util-linux package in Ubuntu:
  New

Bug description:
  Ubuntu 15.04
  mount:
    Installed: 2.25.2-4ubuntu2
    Candidate: 2.25.2-4ubuntu2
    Version table:
   *** 2.25.2-4ubuntu2 0
          500 http://us.archive.ubuntu.com/ubuntu/ vivid/main amd64 Packages
          100 /var/lib/dpkg/status

  System has LVM on SSD standard install ext4 filesystem. (/dev/mapper/ubuntu--vg-root)
  mdadm RAID5 3 disks, btrfs filesystem (/dev/md127p1)
  RAID5 is mounted at /mnt/raid at boot.
  ---
  Bind mounts only display the device mount, not the from directory.
  The mount works, but the mtab entry is incorrect.

  # From LVM device, to LVM device.
  mount -o bind /home/rfoos /srv/nfs4/homes
  # From Raid device, to LVM device
  mount -o bind /mnt/raid/var/lib/libvirt /var/lib/libvirt
  # With corrected fstab entries (below) mount -a does work
  mount -a

  --- /etc/mtab entries
  /dev/mapper/ubuntu--vg-root /srv/nfs4/homes ext4 rw,relatime,errors=remount-ro,data=ordered 0 0
  /dev/md127p1 /var/lib/libvirt btrfs rw,nosuid,nodev,relatime,space_cache 0 0
  /dev/md127p1 /srv/nfs4/share btrfs rw,nosuid,nodev,relatime,space_cache 0 0

  --- mount list of mounts
  /dev/md127p1 on /mnt/raid type btrfs (rw,nosuid,nodev,relatime,space_cache)
  /dev/md127p1 on /var/lib/libvirt type btrfs (rw,nosuid,nodev,relatime,space_cache)
  /dev/mapper/ubuntu--vg-root on /srv/nfs4/homes type ext4 (rw,relatime,errors=remount-ro,data=ordered)

  --- corrected fstab entries.
  # mount raid device
  /dev/md127p1 /mnt/raid btrfs rw,nosuid,nodev,relatime,space_cache 0 0
  # corrected entries
  /mnt/raid/var/lib/libvirt /var/lib/libvirt none bind 0 0
  /home/rfoos /srv/nfs4/homes none bind 0 0

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