[Bug 1950794] Re: DHCPv4 (IAID+DUID) networking broken in LXC containers

[Lukas Märdian]

Turns out dropping "debian/patches/units-Don-t-start-systemd-udev-
trigger.service-in-a-conta.patch" (that we want to drop anyway) makes a
difference here, i.e. removing the "ConditionVirtualization=!container"
line from /usr/lib/systemd/service/systemd-udev-trigger.service.

# apt install systemd udev # upgrade systemd & udev to v249
# systemctl restart systemd-udev-trigger # run the 'udevadm trigger' commands
# systemctl restart systemd-networkd # restart networkd to re-run the DHCPv4 client.


That is even though the systemd-udev-trigger.service fails to execute successfully:
# systemctl status systemd-udev-trigger.service
● systemd-udev-trigger.service - Coldplug All udev Devices
     Loaded: loaded (/lib/systemd/system/systemd-udev-trigger.service; static)
     Active: active (exited) since Wed 2021-11-17 09:39:01 UTC; 37s ago
       Docs: man:udev(7)
             man:systemd-udevd.service(8)
    Process: 74 ExecStart=udevadm trigger --type=subsystems --action=add (code=exited, status=1/FAILURE)
    Process: 101 ExecStart=udevadm trigger --type=devices --action=add (code=exited, status=1/FAILURE)
   Main PID: 101 (code=exited, status=1/FAILURE)
        CPU: 160ms

Nov 17 09:39:01 jj2 udevadm[101]: nvme-delete-wq: Failed to write 'add' to '/sys/devices/virtual/workqueue/nvme-delete-wq/uevent': Permission denied
Nov 17 09:39:01 jj2 udevadm[101]: nvme-reset-wq: Failed to write 'add' to '/sys/devices/virtual/workqueue/nvme-reset-wq/uevent': Permission denied
Nov 17 09:39:01 jj2 udevadm[101]: nvme-wq: Failed to write 'add' to '/sys/devices/virtual/workqueue/nvme-wq/uevent': Permission denied
Nov 17 09:39:01 jj2 udevadm[101]: raid5wq: Failed to write 'add' to '/sys/devices/virtual/workqueue/raid5wq/uevent': Permission denied
Nov 17 09:39:01 jj2 udevadm[101]: scsi_tmf_0: Failed to write 'add' to '/sys/devices/virtual/workqueue/scsi_tmf_0/uevent': Permission denied
Nov 17 09:39:01 jj2 udevadm[101]: writeback: Failed to write 'add' to '/sys/devices/virtual/workqueue/writeback/uevent': Permission denied
Nov 17 09:39:01 jj2 udevadm[101]: dm-0: Failed to write 'add' to '/sys/devices/virtual/block/dm-0/uevent': Permission denied
Nov 17 09:39:01 jj2 udevadm[101]: dm-1: Failed to write 'add' to '/sys/devices/virtual/block/dm-1/uevent': Permission denied
Nov 17 09:39:01 jj2 udevadm[101]: dm-2: Failed to write 'add' to '/sys/devices/virtual/block/dm-2/uevent': Permission denied
Nov 17 09:39:01 jj2 udevadm[101]: dm-3: Failed to write 'add' to '/sys/devices/virtual/block/dm-3/uevent': Permission denied

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https://bugs.launchpad.net/bugs/1950794

Title:
  DHCPv4 (IAID+DUID) networking broken in LXC containers

Status in lxd package in Ubuntu:
  New
Status in systemd package in Ubuntu:
  New

Bug description:
  DHCPv4 networking does not work in the default IAID+DUID
  (ClientIdentifier=duid) mode in LXC containers, using systemd-networkd
  v249.5-2ubuntu1. Static configuration and DHCPv6 work without problem.

  Reproducer:
  $ lxc launch ubuntu-daily:jammy jj
  $ lxc exec jj bash
  # add-apt-repository ppa:ci-train-ppa-service/4704
  # apt install systemd # install systemd 249.5-2ubuntu1
  # cat /etc/systemd/network/00-test.network
  [Match]
  Name=eth0

  [Network]
  DHCP=ipv4
  # systemctl restart systemd-networkd.service
  # networkctl 
  IDX LINK     TYPE     OPERATIONAL SETUP    
  [...]
  611 eth0     ether    carrier     failed  

  A workaround is to avoid IAID+DUID mode via:
  [DHCPv4]
  #ClientIdentifier=mac
  ClientIdentifier=duid-only

  Interesting logs:
  Nov 12 14:10:48 jj systemd-networkd[174]: eth0: Requested to activate link
  Nov 12 14:10:48 jj systemd-networkd[174]: eth0: DHCPv4 client: Failed to set IAID: Device or resource busy
  Nov 12 14:10:48 jj systemd-networkd[174]: eth0: DHCP4 CLIENT: Failed to set IAID+DUID: Device or resource busy
  Nov 12 14:10:48 jj systemd-networkd[174]: Failed to check link is initialized: Device or resource busy
  Nov 12 14:10:48 jj systemd-networkd[174]: eth0: Failed

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