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[Launchpad Bug Tracker <1669564@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package nplan - 0.32~17.10.1

---------------
nplan (0.32~17.10.1) artful; urgency=medium

  * Backport 0.32 to Ubuntu 17.10. (LP: #1713142)

nplan (0.32) bionic; urgency=medium

  * src/nm.c: better handle the UUID generation; the order of iterating
    through interaces may affect things here. Also make sure the tests catch
    a null UUID.

nplan (0.31) bionic; urgency=medium

  [ Mathieu Trudel-Lapierre ]
  * src/nm.c: generate a UUID for a connection only as needed; when we're
    dealing with NM VLANs. (LP: #1712921)
  * debian/tests/autostart: Make the autostart test more verbose and avoid
    failing right from the start when systemd-networkd is disabled.
    (LP: #1699371)
  * tests/integration.py: bump the NetworkManager timeout for settling to
    120 seconds, autopkgtest infrastructure tends to be a little slow for the
    network device configuration to be applied and noticed by NM.
    (LP: #1699371)

  [ Dimitri John Ledkov ]
  * Reload udevd to invalidate configuration cache of .rules/.link files
    as generate step may have changed them. LP: #1669564

  [ Dan Streetman ]
  * Add another interface driver exception to netplan replug to prevent unbind
    of the Xen VIF interfaces. (LP: #1729573)

 -- Mathieu Trudel-Lapierre <cyphermox@xxxxxxxxxx>  Thu, 23 Nov 2017
12:30:51 -0500

** Changed in: nplan (Ubuntu Artful)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1669564

Title:
  udevadm trigger subsystem-match=net doesn't always run rules because
  of reconfiguration rate-limiting

Status in nplan package in Ubuntu:
  Fix Released
Status in nplan source package in Xenial:
  Fix Committed
Status in nplan source package in Zesty:
  Fix Committed
Status in nplan source package in Artful:
  Fix Released
Status in nplan source package in Bionic:
  Fix Released

Bug description:
  [Impact]
  Proper udev trigger behavior following a 'netplan apply' is essential to having all the configuration applied for an interface.

  [Test case]
  1- Write a netplan configuration file that sets MTU for a device, or renames a device.
  2- Run 'netplan apply'
  Validate that all the changes were correctly applied: netplan apply will run 'udevadm trigger' for the user, and udev should apply all low-level link changes (MTU and renames).
  Make sure to watch out for device renames on devices that are blacklisted for replugging such as mwifiex, XEN VIF, etc.

  [Regression potential]
  Verification should watch out for a MTU being set, but set to the wrong value, or MTUs being applied to all interfaces rather than just the interface for which it was set. Users should also watch out for the network device to be renamed correctly, and then seen as the correct name and state in both networkd and the ip command.

  ---

  1. root@ubuntu:~# lsb_release -rd
  Description:    Ubuntu Zesty Zapus (development branch)
  Release:        17.04

  2. root@ubuntu:~# apt-cache policy udev
  udev:
    Installed: 232-18ubuntu1
    Candidate: 232-18ubuntu1
    Version table:
   *** 232-18ubuntu1 500
          500 http://archive.ubuntu.com/ubuntu zesty/main amd64 Packages
          100 /var/lib/dpkg/status

  3. udevadm trigger --verbose --subsystem-match=net --action=add will run and read .link files from /run/systemd/network/10-netplan-interface1.link
  and apply MTU settings

  4. during system boot running (3) does not set the MTU; running (3)
  after boot has completed MTU is set correctly.

  Here'a log during boot where cloud-init generates a netplan config,
  invokes `netplan generate` which writes the networkd config out
  and then udevadm trigger (3).  Upon logging in interface1 has an MTU of 1500.  Re-running udevadm trigger now runs the rules/link files and updates the MTU.

  Note that, if you run udevadm test /sys/class/net/interface1; this also will
  apply the MTU (test probably shouldn't change the interface, I'll file a
  bug for that as well).

  # journalctl -o short-precise --no-pager -b | grep WARK
  Mar 02 19:17:19.839797 ubuntu cloud-init[647]: WARK: ['netplan', '--debug', 'generate']:
  Mar 02 19:17:19.839797 ubuntu cloud-init[647]: WARK: ['stat', '/run/systemd/network/10-netplan-interface1.link']:
  Mar 02 19:17:19.839797 ubuntu cloud-init[647]: WARK: ['cat', '/run/systemd/network/10-netplan-interface1.link']:
  Mar 02 19:17:19.839797 ubuntu cloud-init[647]: WARK: ['systemctl', 'start', '--no-block', 'systemd-udev-trigger.service']:
  Mar 02 19:17:19.839797 ubuntu cloud-init[647]: WARK: ['udevadm', 'trigger', '--verbose', '--subsystem-match=net', '--action=add']:

  root@ubuntu:~# cat /run/systemd/network/10-netplan-interface1.link
  [Match]
  MACAddress=52:54:00:12:34:02

  [Link]
  Name=interface1
  WakeOnLan=off
  MTUBytes=1492

  root@ubuntu:~# ifconfig interface1
  interface1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
          inet 10.0.2.100  netmask 255.255.255.0  broadcast 10.0.2.255
          inet6 fe80::5054:ff:fe12:3402  prefixlen 64  scopeid 0x20<link>
          inet6 fec0::5054:ff:fe12:3402  prefixlen 64  scopeid 0x40<site>
          ether 52:54:00:12:34:02  txqueuelen 1000  (Ethernet)
          RX packets 16  bytes 5053 (5.0 KB)
          RX errors 0  dropped 0  overruns 0  frame 0
          TX packets 35  bytes 3287 (3.2 KB)
          TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

  root@ubuntu:~# udevadm trigger --verbose --subsystem-match=net --action=add
  /sys/devices/pci0000:00/0000:00:04.0/virtio1/net/interface1
  /sys/devices/pci0000:00/0000:00:05.0/virtio2/net/interface2
    ys/devices/pci0000:00/0000:00:06.0/virtio3/net/interface0
  /sys/devices/virtual/net/lo

  root@ubuntu:~# ifconfig interface1
  interface1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1492
          inet 10.0.2.100  netmask 255.255.255.0  broadcast 10.0.2.255
          inet6 fe80::5054:ff:fe12:3402  prefixlen 64  scopeid 0x20<link>
          inet6 fec0::5054:ff:fe12:3402  prefixlen 64  scopeid 0x40<site>
          ether 52:54:00:12:34:02  txqueuelen 1000  (Ethernet)
          RX packets 16  bytes 5053 (5.0 KB)
          RX errors 0  dropped 0  overruns 0  frame 0
          TX packets 37  bytes 3504 (3.5 KB)
          TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

  ProblemType: Bug
  DistroRelease: Ubuntu 17.04
  Package: udev 232-18ubuntu1
  ProcVersionSignature: Ubuntu 4.10.0-8.10-generic 4.10.0-rc8
  Uname: Linux 4.10.0-8-generic x86_64
  ApportVersion: 2.20.4-0ubuntu2
  Architecture: amd64
  Date: Thu Mar  2 19:22:14 2017
  Lsusb: Error: command ['lsusb'] failed with exit code 1:
  MachineType: QEMU Standard PC (i440FX + PIIX, 1996)
  ProcEnviron:
   TERM=vt220
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.10.0-8-generic root=UUID=8bbb84fe-91e8-4a9a-bd91-f6af4793727e ro console=ttyS0
  SourcePackage: systemd
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 04/01/2014
  dmi.bios.vendor: SeaBIOS
  dmi.bios.version: 1.10.1-1ubuntu1
  dmi.chassis.type: 1
  dmi.chassis.vendor: QEMU
  dmi.chassis.version: pc-i440fx-zesty
  dmi.modalias: dmi:bvnSeaBIOS:bvr1.10.1-1ubuntu1:bd04/01/2014:svnQEMU:pnStandardPC(i440FX+PIIX,1996):pvrpc-i440fx-zesty:cvnQEMU:ct1:cvrpc-i440fx-zesty:
  dmi.product.name: Standard PC (i440FX + PIIX, 1996)
  dmi.product.version: pc-i440fx-zesty
  dmi.sys.vendor: QEMU

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