[Bug 1852754] [NEW] networkd does not complete interface configuration if Link MTUBytes is set

[Dan Streetman]

Public bug reported:

[impact]

interfaces configured with .network file [Link] section specifying
MTUBytes will not be successfully brought up.

[test case]

configure interface e.g.

Name=ens3

[Network]
DHCP=ipv4
LinkLocalAddressing=ipv6

[Link]
MTUBytes=1550

start/restart networkd, the interface will never reach 'routable' stage
and will not get an IPv4 address.

[regression potential]

regressions will likely occur during networkd
configuration/startup/restart, and would likely cause failure to
successfully setup the interface.

[other info]

this is a regression-proposed caused by incomplete backport for bug
1850704

** Affects: systemd
     Importance: Unknown
         Status: Unknown

** Affects: systemd (Ubuntu)
     Importance: Undecided
         Status: Fix Released

** Affects: systemd (Ubuntu Bionic)
     Importance: Critical
     Assignee: Dan Streetman (ddstreet)
         Status: In Progress


** Tags: bionic ddstreet regression-proposed systemd

** Also affects: systemd (Ubuntu Bionic)
   Importance: Undecided
       Status: New

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

** Bug watch added: github.com/systemd/systemd/issues #9831
   https://github.com/systemd/systemd/issues/9831

** Also affects: systemd via
   https://github.com/systemd/systemd/issues/9831
   Importance: Unknown
       Status: Unknown

** Changed in: systemd (Ubuntu Bionic)
       Status: New => In Progress

** Changed in: systemd (Ubuntu Bionic)
   Importance: Undecided => Critical

** Changed in: systemd (Ubuntu Bionic)
     Assignee: (unassigned) => Dan Streetman (ddstreet)

** Tags added: bionic ddstreet regression-proposed systemd

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https://bugs.launchpad.net/bugs/1852754

Title:
  networkd does not complete interface configuration if Link MTUBytes is
  set

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

Bug description:
  [impact]

  interfaces configured with .network file [Link] section specifying
  MTUBytes will not be successfully brought up.

  [test case]

  configure interface e.g.

  Name=ens3

  [Network]
  DHCP=ipv4
  LinkLocalAddressing=ipv6

  [Link]
  MTUBytes=1550

  start/restart networkd, the interface will never reach 'routable'
  stage and will not get an IPv4 address.

  [regression potential]

  regressions will likely occur during networkd
  configuration/startup/restart, and would likely cause failure to
  successfully setup the interface.

  [other info]

  this is a regression-proposed caused by incomplete backport for bug
  1850704

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