Bug#941603: udev: bond interface does not inherit mac address of a slave

[Alexandra N. Kossovsky]

Package: udev
Version: 242-7
Severity: normal

When I create a bonding interface on an older Debian system, it
naturally inherits one of the slave's mac address.  With new Debian
testing (systemd=242-7) the bonding interface gets a strange MAC
address.

The issue is, if I connect 2 Debian systems with a bonding interface,
then the 2 ends of the link has the same MAC address, and it all breaks.

I tried to downgrade systemd to Debian buster version 241-7~deb10u1, and
it did not help (systemd, libsystemd0, libpam-systemd, systemd-coredump
packages).  Then I downgraded udev as well (udev, libudev1, libudev-dev, 
libudev1:i386, libudev-dev:i386 packages).  Bonding interfaces got
different MAC addresses and started to work properly.


I.e. it is a regression in udev. which assigns some strange MAC address
to a just-created bonding interface; with a high chance that the
addresses of 2 link ends are the same.


To reproduce:
sudo ip link add bond0 type bond mode 1
cat /sys/devices/virtual/net/bond0/addr_assign_type
ip li li dev bond0

I expect to see NET_ADDR_RANDOM=1 as the addr_assign_type, and different
MAC addresses on different systems as a result of the "ip" command.
With the last udev, I see NET_ADDR_SET=3 as the addr_assign_type, and
the same MAC address on both ends of my bond link.



-- Package-specific info:

-- System Information:
Debian Release: bullseye/sid
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'proposed-updates'), (500, 'testing'), (500, 'stable'), (200, 'experimental'), (30, 'unstable')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 5.2.0-3-amd64 (SMP w/8 CPU cores)
Locale: LANG=en_GB.UTF-8, LC_CTYPE=ru_RU.UTF-8 (charmap=UTF-8), LANGUAGE= (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash
Init: systemd (via /run/systemd/system)

Versions of packages udev depends on:
ii  adduser       3.118
ii  dpkg          1.19.7
ii  libacl1       2.2.53-5
ii  libblkid1     2.34-0.1
ii  libc6         2.29-2
ii  libkmod2      26-3
ii  libselinux1   2.9-2+b2
ii  libudev1      242-7
ii  systemd-sysv  242-7
ii  util-linux    2.34-0.1

udev recommends no packages.

udev suggests no packages.

Versions of packages udev is related to:
ii  systemd  242-7

-- debconf information:
  udev/reboot_needed:
  udev/title/upgrade:
  udev/new_kernel_needed: false
  udev/sysfs_deprecated_incompatibility:

-- 
Alexandra N. Kossovsky
OKTET Labs (http://www.oktetlabs.ru/)