Public bug reported:
I haven't verified this, but I believe that ifupdown works through udevadm
hooks.
So udevadm hotplug event -> ifup eth0.
Any subprocesses of a udevadm hook will be restricted by the
systemd-udevd.service
restrictions, which currently are
RestrictAddressFamilies=AF_UNIX AF_NETLINK AF_INET AF_INET6
We found this when playing with udevamd hooks to bring up network
devices on cosmic (netplan).
root@b1:~# systemctl cat udev.service
# /lib/systemd/system/systemd-udevd.service
# SPDX-License-Identifier: LGPL-2.1+
#
# This file is part of systemd.
#
# systemd is free software; you can redistribute it and/or modify it
# under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation; either version 2.1 of the License, or
# (at your option) any later version.
[Unit]
Description=udev Kernel Device Manager
Documentation=man:systemd-udevd.service(8) man:udev(7)
DefaultDependencies=no
After=systemd-sysusers.service systemd-hwdb-update.service
Before=sysinit.target
ConditionPathIsReadWrite=/sys
[Service]
Type=notify
OOMScoreAdjust=-1000
Sockets=systemd-udevd-control.socket systemd-udevd-kernel.socket
Restart=always
RestartSec=0
ExecStart=/lib/systemd/systemd-udevd
KillMode=mixed
WatchdogSec=3min
TasksMax=infinity
MountFlags=slave
MemoryDenyWriteExecute=yes
RestrictRealtime=yes
RestrictAddressFamilies=AF_UNIX AF_NETLINK AF_INET AF_INET6
SystemCallArchitectures=native
LockPersonality=yes
IPAddressDeny=any
ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ifupdown 0.8.17ubuntu1.1
ProcVersionSignature: Ubuntu 4.17.0-9.10-generic 4.17.17
Uname: Linux 4.17.0-9-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.3
Architecture: amd64
Date: Wed Sep 12 15:09:01 2018
ProcEnviron:
TERM=screen.xterm-256color
PATH=(custom, no user)
LANG=C.UTF-8
SourcePackage: ifupdown
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: ifupdown (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug bionic uec-images
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https://bugs.launchpad.net/bugs/1792168
Title:
ifupdown hotplug dhcp fails due to udevadm RestrictAddressFamilies
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