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[Launchpad Bug Tracker <1669755@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package xe-guest-utilities -
6.2.0-1120+dsf1-0ubuntu4

---------------
xe-guest-utilities (6.2.0-1120+dsf1-0ubuntu4) zesty; urgency=medium

  * debian/xe-guest-utilities.xe-daemon.service: declare
    DefaultDependencies=no to prevent dependency cycles. The unit cannot
    be simultaniously before and after sysinit target. By default all
    units are after sysinit target, yet cloud-init-local is before it. LP:
    #1669755

 -- Dimitri John Ledkov <xnox@xxxxxxxxxx>  Fri, 03 Mar 2017 12:33:01
+0000

** Changed in: xe-guest-utilities (Ubuntu Zesty)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1669755

Title:
  Circular boot dependency cycle with cloud-init et.al.

Status in xe-guest-utilities package in Ubuntu:
  Fix Released
Status in xe-guest-utilities source package in Xenial:
  Triaged
Status in xe-guest-utilities source package in Yakkety:
  Triaged
Status in xe-guest-utilities source package in Zesty:
  Fix Released

Bug description:
  [Impact]

   * xe-deamon.service tries to be an early boot unit; before cloud-init-local / networking is setup
   * However it does not declare DefaultDependencies=no, and thus tries to pull in sysinit.target which should happen after cloud-init-local; yet xe-daemon.service is declared to be before cloud-init-local, thus this is a conflict of interest.
   * xe-deamon should declare DefaultDependencies=no

  = Current unit =
  [Unit]
  Description=Xen Guest Monitoring Agent
  After=local-fs.target
  Requires=proc-xen.mount
  Before=network.target cloud-init.service cloud-init-local.service
  ConditionVirtualization=xen
  ConditionPathExists=/proc/xen/capabilities

  [Service]
  ExecStartPre=/usr/sbin/xe-linux-distribution /var/cache/xe-linux-distribution
  ExecStart=/usr/sbin/xe-daemon
  StandardOutput=journal+console

  [Install]
  WantedBy=multi-user.target

  = Proposed fix =

  --- xe-guest-utilities.xe-daemon.service.old	2017-03-03 11:45:48.679700766 +0000
  +++ xe-guest-utilities.xe-daemon.service	2017-03-03 11:46:07.923549054 +0000
  @@ -1,5 +1,6 @@
   [Unit]
   Description=Xen Guest Monitoring Agent
  +DefaultDependencies=no
   After=local-fs.target
   Requires=proc-xen.mount
   Before=network.target cloud-init.service cloud-init-local.service

  ==

  [Test Case]

   * Boot a cloud instance, with xen hypervisor and cloud-init metdata
   * There should be no boot cycles

  [Regression Potential]

   * Minimal, currently xe-daemon.service creates dependency cycles
  which prevent reliable and reproducible boots.

  [Other Info]

   * Related bug #1496730

  [Dependency cycle]

  Mar 03 12:01:15 slmeta1 systemd[1]: basic.target: Found ordering cycle on basic.target/start
  Mar 03 12:01:15 slmeta1 systemd[1]: basic.target: Found dependency on sockets.target/start
  Mar 03 12:01:15 slmeta1 systemd[1]: basic.target: Found dependency on snapd.socket/start
  Mar 03 12:01:15 slmeta1 systemd[1]: basic.target: Found dependency on sysinit.target/start
  Mar 03 12:01:15 slmeta1 systemd[1]: basic.target: Found dependency on cloud-init.service/start
  Mar 03 12:01:15 slmeta1 systemd[1]: basic.target: Found dependency on cloud-init-local.service/start
  Mar 03 12:01:15 slmeta1 systemd[1]: basic.target: Found dependency on xe-daemon.service/start
  Mar 03 12:01:15 slmeta1 systemd[1]: basic.target: Found dependency on basic.target/start
  Mar 03 12:01:15 slmeta1 systemd[1]: basic.target: Breaking ordering cycle by deleting job sockets.target/start
  Mar 03 12:01:15 slmeta1 systemd[1]: sockets.target: Job sockets.target/start deleted to break ordering cycle starting with basic.target/start
  Mar 03 12:01:15 slmeta1 systemd[1]: basic.target: Found ordering cycle on basic.target/start
  Mar 03 12:01:15 slmeta1 systemd[1]: basic.target: Found dependency on sysinit.target/start
  Mar 03 12:01:15 slmeta1 systemd[1]: basic.target: Found dependency on cloud-init.service/start
  Mar 03 12:01:15 slmeta1 systemd[1]: basic.target: Found dependency on cloud-init-local.service/start
  Mar 03 12:01:15 slmeta1 systemd[1]: basic.target: Found dependency on xe-daemon.service/start
  Mar 03 12:01:15 slmeta1 systemd[1]: basic.target: Found dependency on basic.target/start
  Mar 03 12:01:15 slmeta1 systemd[1]: basic.target: Breaking ordering cycle by deleting job cloud-init.service/start
  Mar 03 12:01:15 slmeta1 systemd[1]: cloud-init.service: Job cloud-init.service/start deleted to break ordering cycle starting with basic.target/start
  Mar 03 12:01:15 slmeta1 systemd[1]: basic.target: Found ordering cycle on basic.target/start
  Mar 03 12:01:15 slmeta1 systemd[1]: basic.target: Found dependency on sysinit.target/start
  Mar 03 12:01:15 slmeta1 systemd[1]: basic.target: Found dependency on cloud-init-local.service/start
  Mar 03 12:01:15 slmeta1 systemd[1]: basic.target: Found dependency on xe-daemon.service/start
  Mar 03 12:01:15 slmeta1 systemd[1]: basic.target: Found dependency on basic.target/start
  Mar 03 12:01:15 slmeta1 systemd[1]: basic.target: Breaking ordering cycle by deleting job cloud-init-local.service/start
  Mar 03 12:01:15 slmeta1 systemd[1]: cloud-init-local.service: Job cloud-init-local.service/start deleted to break ordering cycle starting with basic.target/start

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