[Bug 1755863] Re: netbooting the bionic live CD over NFS goes straight to maintenance mode :

[Dan Streetman]

** Changed in: systemd (Ubuntu Cosmic)
       Status: Triaged => In Progress

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Title:
  netbooting the bionic live CD over NFS goes straight to maintenance
  mode :

Status in systemd:
  Unknown
Status in systemd package in Ubuntu:
  Fix Released
Status in systemd source package in Xenial:
  In Progress
Status in systemd source package in Bionic:
  In Progress
Status in systemd source package in Cosmic:
  In Progress
Status in systemd source package in Disco:
  Fix Released

Bug description:
  [Impact]

  Mounting manually a network share (NFS) and masking it breaks the state of other units (and their dependencies).
  Casper is masking a mounted NFS share, blocking the normal boot process as described in the original description, but the issue comes from systemd.

  [Test Case]

  - NFS mount point at /media
  root at iscsi-bionic:/home/ubuntu# mount | grep media
  10.230.56.72:/tmp/mnt on /media type nfs4 (rw,relatime,vers=4.2,rsize=1048576,wsize=1048576,namlen=255,hard,proto=tcp,timeo=600,retrans=2,sec=sys,clientaddr=192.168.122.127,local_lock=none,addr=10.230.56.72)

  - Test mount point (/test) defined in /etc/fstab:
  root at iscsi-bionic:/home/ubuntu# cat /etc/fstab |grep test
  tmpfs /test tmpfs nosuid,nodev 0 0

  1. If media.mount is not masked, everything works fine:

  root at iscsi-bionic:/home/ubuntu# mount | grep test
  root at iscsi-bionic:/home/ubuntu# systemctl status media.mount | grep Active
     Active: active (mounted) since Thu 2018-11-15 16:03:59 UTC; 3 weeks 6 days ago
  root at iscsi-bionic:/home/ubuntu# systemctl status test.mount | grep Active
     Active: inactive (dead) since Thu 2018-12-13 10:33:52 UTC; 4min 11s ago
  root at iscsi-bionic:/home/ubuntu# systemctl start test.mount
  root at iscsi-bionic:/home/ubuntu# systemctl status test.mount | grep Active
     Active: active (mounted) since Thu 2018-12-13 10:38:13 UTC; 3s ago
  root at iscsi-bionic:/home/ubuntu# mount | grep test
  tmpfs on /test type tmpfs (rw,nosuid,nodev,relatime)
  root at iscsi-bionic:/home/ubuntu# systemctl stop test.mount
  root at iscsi-bionic:/home/ubuntu# systemctl status test.mount | grep Active
     Active: inactive (dead) since Thu 2018-12-13 10:38:32 UTC; 3s ago
  root at iscsi-bionic:/home/ubuntu# mount | grep test

  2. If media.mount is masked, other mounts are failing:

  root at iscsi-bionic:/home/ubuntu# systemctl mask media.mount
  Created symlink /etc/systemd/system/media.mount → /dev/null.
  root at iscsi-bionic:/home/ubuntu# systemctl start test.mount
  Job for test.mount failed.
  See "systemctl status test.mount" and "journalctl -xe" for details.
  root at iscsi-bionic:/home/ubuntu# systemctl status test.mount | grep Active
     Active: failed (Result: protocol) since Thu 2018-12-13 10:40:06 UTC; 10s ago
  root at iscsi-bionic:/home/ubuntu# mount | grep test
  tmpfs on /test type tmpfs (rw,nosuid,nodev,relatime)
  root at iscsi-bionic:/home/ubuntu# systemctl stop test.mount
  root at iscsi-bionic:/home/ubuntu# systemctl status test.mount | grep Active
     Active: failed (Result: protocol) since Thu 2018-12-13 10:40:06 UTC; 25s ago
  root at iscsi-bionic:/home/ubuntu# mount | grep test
  tmpfs on /test type tmpfs (rw,nosuid,nodev,relatime)
  root at iscsi-bionic:/home/ubuntu# systemctl start test.mount
  Job for test.mount failed.
  See "systemctl status test.mount" and "journalctl -xe" for details.
  root at iscsi-bionic:/home/ubuntu# mount | grep test
  tmpfs on /test type tmpfs (rw,nosuid,nodev,relatime)
  tmpfs on /test type tmpfs (rw,nosuid,nodev,relatime)
  root at iscsi-bionic:/home/ubuntu# systemctl stop test.mount
  root at iscsi-bionic:/home/ubuntu# mount | grep test
  tmpfs on /test type tmpfs (rw,nosuid,nodev,relatime)
  tmpfs on /test type tmpfs (rw,nosuid,nodev,relatime)

  [Regression potential]

  Minimal. Originally, one failing mount point blocked the processing of
  the rest due to how the return codes were handled for every line in
  /proc/self/mountinfo. This patch removes this "dependency" and keeps
  the failure local to the affected mount point, allowing the rest to be
  processed normally.

  [Other Info]

  Upstream bug: https://github.com/systemd/systemd/issues/10874
  Fixed upstream with commit: https://github.com/systemd/systemd/commit/c165888426ef99440418592a8cdbaff4b7c319b3

  [Original Description]

  
  netbooting the bionic live CD[1] over NFS goes straight to maintenance mode :

  [1] http://cdimage.ubuntu.com/daily-live/current/

  # casper.log
  Begin: Adding live session user... ... dbus-daemon[568]: [session uid=999 pid=568] Activating service name='org.gtk.vfs.Daemon' requested by ':1.0' (uid=999 pid=569 comm="" label="unconfined")
  dbus-daemon[568]: [session uid=999 pid=568] Successfully activated service 'org.gtk.vfs.Daemon'
  dbus-daemon[568]: [session uid=999 pid=568] Activating service name='org.gtk.vfs.Metadata' requested by ':1.0' (uid=999 pid=569 comm="" label="unconfined")
  fuse: device not found, try 'modprobe fuse' first
  dbus-daemon[568]: [session uid=999 pid=568] Successfully activated service 'org.gtk.vfs.Metadata'

  (gvfsd-metadata:580): GUdev-CRITICAL **: 16:28:56.270:
  g_udev_device_has_property: assertion 'G_UDEV_IS_DEVICE (device)'
  failed

  (gvfsd-metadata:580): GUdev-CRITICAL **: 16:28:56.270: g_udev_device_has_property: assertion 'G_UDEV_IS_DEVICE (device)' failed
  A connection to the bus can't be made
  done.
  Begin: Setting up init... ... done.

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