[Bug 1727687] Re: systemd boots system offline ("Breaking ordering cycle by deleting job network.target/stop")

[Norbert]

Situation repeated yesterday and today. I purged network-manager and set
up eth0 as DHCP in /etc/network/interfaces.

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Title:
  systemd boots system offline ("Breaking ordering cycle by deleting job
  network.target/stop")

Status in systemd package in Ubuntu:
  New

Bug description:
  Steps to reproduce:
  1. Install Ubuntu 16.04 LTS
  2. Install LTSP server (dnsmasq as proxy DHCP and tftp; NBD, SSH)
  3. Reboot.
  4. Boot system

  Expected results:
  * system boots to online 

  Actual results:
  * system boots offline; it's a security vulnerability as denial of service

  
  Interesting messages from syslog:

  
  Oct 19 15:25:56 server systemd[1]: network-online.target: Found ordering cycle on network-online.target/stop
  Oct 19 15:25:56 server systemd[1]: network-online.target: Found dependency on network.target/stop
  Oct 19 15:25:56 server systemd[1]: network-online.target: Found dependency on NetworkManager.service/stop
  Oct 19 15:25:56 server systemd[1]: network-online.target: Found dependency on basic.target/stop
  Oct 19 15:25:56 server systemd[1]: network-online.target: Found dependency on paths.target/stop
  Oct 19 15:25:56 server systemd[1]: network-online.target: Found dependency on cups.path/stop
  Oct 19 15:25:56 server systemd[1]: network-online.target: Found dependency on sysinit.target/stop
  Oct 19 15:25:56 server systemd[1]: network-online.target: Found dependency on nbd-client.service/stop
  Oct 19 15:25:56 server systemd[1]: network-online.target: Found dependency on network-online.target/stop
  Oct 19 15:25:56 server systemd[1]: network-online.target: Breaking ordering cycle by deleting job network.target/stop
  Oct 19 15:25:56 server systemd[1]: network.target: Job network.target/stop deleted to break ordering cycle starting with network-online.target/stop

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: systemd 229-4ubuntu19
  ProcVersionSignature: Ubuntu 4.4.0-93.116-generic 4.4.79
  Uname: Linux 4.4.0-93-generic i686
  ApportVersion: 2.20.1-0ubuntu2.10
  Architecture: i386
  CurrentDesktop: MATE
  Date: Thu Oct 26 13:50:49 2017
  InstallationDate: Installed on 2016-04-21 (552 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release i386 (20160420.1)
  MachineType: Gigabyte Technology Co., Ltd. To be filled by O.E.M.
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-93-generic root=UUID=26069a01-c072-4021-83c5-f6df23dc51d5 ro net.ifnames=0 biosdevname=0 quiet splash vt.handoff=7
  SourcePackage: systemd
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 01/09/2014
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: FD
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: F2A55M-DS2
  dmi.board.vendor: Gigabyte Technology Co., Ltd.
  dmi.board.version: x.x
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrFD:bd01/09/2014:svnGigabyteTechnologyCo.,Ltd.:pnTobefilledbyO.E.M.:pvrTobefilledbyO.E.M.:rvnGigabyteTechnologyCo.,Ltd.:rnF2A55M-DS2:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvrToBeFilledByO.E.M.:
  dmi.product.name: To be filled by O.E.M.
  dmi.product.version: To be filled by O.E.M.
  dmi.sys.vendor: Gigabyte Technology Co., Ltd.

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