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[Launchpad Bug Tracker <696435@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package systemd - 229-4ubuntu21.2

---------------
systemd (229-4ubuntu21.2) xenial; urgency=medium

  [ Dimitri John Ledkov ]
  * udev: Mark ndb devices as inactive until connected. (LP: #696435)
  * networkd: in dhcp, change UseMTU default to true, to accept DHCP provided MTU by default.
    (LP: #1717471)
  * sysctl: apply parameters in-order, instead of randomly. (LP: #1718444)
  * networkd: apply promote_secondaries, to make DHCP lease changes work.
    (LP: #1721223)
  * shutdown: sync filesystems, before going into a killing spree.
    (LP: #1722481)
  * sysctl: do not fail, when cannot apply sysctl changes due to read-only sysfs in containers.
    (LP: #1734409)
  * networkd,wait-online: add RequiredForOnline to mark mandatory/optional links for boot.
    (LP: #1737570)

  [ David Glasser ]
  * journald: don't reduce BurstRateLimit on low disk space (LP: #1732803)

 -- Dimitri John Ledkov <xnox@xxxxxxxxxx>  Wed, 21 Feb 2018 13:46:37
+0000

** Changed in: systemd (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/696435

Title:
  wait-for-root fails to detect nbd root

Status in linux package in Ubuntu:
  Fix Released
Status in nbd package in Ubuntu:
  Invalid
Status in systemd package in Ubuntu:
  Fix Released
Status in linux source package in Xenial:
  Fix Released
Status in systemd source package in Xenial:
  Fix Released

Bug description:
  [Impact]
  Kernel does not generate any events when ndb-client connects /dev/nbd0 devices, therefore it is impossible to monitor/react to the state of /dev/nbd0.

  [Fix]
  Generate change uevent when size of /dev/nbd0 changes

  [Testcase]
  * Start udevadm monitor
  * modprobe nbd
  * use ndb-client to connect something to /dev/nbd0
  * observe that there are change udev events generated on /dev/nbd0 itself

  [Regression Potential]
  There is no change to existing uevents, or their ordering.
  There is now an addition change event which will cause systemd to mark ndb devices as ready and trigger appropriate actions

  [Original Bug Report]

  When using an nbd root, wait-for-root blocks for 30 seconds before
  booting continues successfully.

  Using Ubuntu Natty, related packages versions:
      nbd-client 1:2.9.16-6ubuntu1
      initramfs-tools 0.98.1ubuntu9

  The wait-for-root call from /usr/share/initramfs-tools/scripts/local:
   while [ -z "${FSTYPE}" ]; do
    FSTYPE=$(wait-for-root "${ROOT}" ${ROOTDELAY:-30})

    # Run failure hooks, hoping one of them can fix up the system
    # and we can restart the wait loop.  If they all fail, abort
    # and move on to the panic handler and shell.
    if [ -z "${FSTYPE}" ] && ! try_failure_hooks; then
     break
    fi
   done

  I replaced wait-for-root with a sh script that did `set >&2`, here are the relevant environment variables at the time wait-for-root was called:
  ROOT='/dev/nbd0'
  ROOTDELAY=''
  ROOTFLAGS=''
  ROOTFSTYPE=''
  nbdroot='192.168.0.1,2011'

  It's probably worth noting that "nbd0: unknown partition table" was
  displayed asynchronously 1-2 seconds after wait-for-root was invoked
  and while it was still waiting. But I tried adding a "sleep 5" as the
  last line of local-top/nbd, so that the nbd message was displayed a
  lot before wait-for-root was called, and it didn't make a difference.
  So I don't think a race condition is involved in this problem.

  Temporarily I'm passing rootdelay=1 in the kernel command line to work
  around the problem.

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