[Bug 1923115] Re: Networkd vs udev nic renaming race condition

[Seyeong Kim]

** Patch added: "lp1923115_bionic.debdiff"
   https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1923115/+attachment/5485751/+files/lp1923115_bionic.debdiff

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Title:
  Networkd vs udev nic renaming race condition

Status in systemd package in Ubuntu:
  Fix Released
Status in systemd source package in Bionic:
  In Progress
Status in systemd source package in Focal:
  Fix Released

Bug description:
  [Impact]

  systemd-networkd renames nic just after udev renamed it

  e.g

  kernel: [ 2.827368] vmxnet3 0000:0b:00.0 ens192: renamed from eth0
  kernel: [ 7.562729] vmxnet3 0000:0b:00.0 eth0: renamed from ens192
  systemd-networkd[511]: ens192: Interface name change detected, ens192 has been renamed to eth0.

  This cause netplan or the other network management pkg can't find
  proper nic sometimes.

  This happens on Bionic

  Below commit seems to solve this issue.
  https://github.com/systemd/systemd/pull/11881/commits/30de2b89d125a8692c22579ef805b03f2054b30b

  There are bunch of related commits but above one the customer tested
  it worked.

  [Test Plan]

  The customer has issue and they could help us to test this.
  Internally they already test this and it worked.

  [Where problems could occur]

  systemd-networkd nic renaming could have issue.

  [Others]

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