[Bug 1914062] Re: NetworkManager-wait-online.service in 1.28.0-2ubuntu1 fails to start in LXC

[Balint Reczey]

@seb128 I tried remounting /sys in systemd but it created other issues.
I've fixed udevd to not start in lxc in systemd, but this is all systemd can do. Please detect running udev in network-manager without assuming that rw /sys implies running udev.

@ LXD devs, please check if the init to start is systemd and if so
please mount /sys ro to conform to systemd's
https://systemd.io/CONTAINER_INTERFACE/ or sort convince systemd
upstream to include LXC in the container interface with rw /sys.


** Also affects: network-manager (Ubuntu)
   Importance: Undecided
       Status: New

** Also affects: lxd (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1914062

Title:
  NetworkManager-wait-online.service in 1.28.0-2ubuntu1 fails to start
  in LXC

Status in lxd package in Ubuntu:
  New
Status in network-manager package in Ubuntu:
  New
Status in systemd package in Ubuntu:
  Triaged

Bug description:
  This regresses systemd's autopkgtest because it expects the system in
  the container to reach running state, but the system ends up in
  degraded state due to the service failing.

  https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac/autopkgtest-hirsute/hirsute/amd64/s/systemd/20210112_185712_ff570@/log.gz
  ...

  ======================================================================
  FAIL: test_no_failed (__main__.ServicesTest)
  No failed units
  ----------------------------------------------------------------------
  Traceback (most recent call last):
    File "/tmp/autopkgtest.fFC3Lw/build.xLc/real-tree/debian/tests/boot-and-services", line 68, in test_no_failed
      self.assertEqual(failed, [])
  AssertionError: Lists differ: ['● NetworkManager-wait-online.service loa[42 chars]ine'] != []

  First list contains 1 additional elements.
  First extra element 0:
  '● NetworkManager-wait-online.service loaded failed failed Network Manager Wait Online'

  + []
  - ['● NetworkManager-wait-online.service loaded failed failed Network Manager '
  -  'Wait Online']

  ----------------------------------------------------------------------
  Ran 23 tests in 4.435s
  ...

  Reproducible locally by installing n-m from -proposed, then restarting
  the system in the LXC container.

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