[Bug 1842651] Re: Regression: after Uprade from udev_237-3ubuntu10.25 to udev_237-3ubuntu10.26 network interfaces don't get renamed by 70-persistent-network.rules

[Chris Coulson]

If this change is being reverted, it needs to be done via the security
pocket rather than proposed, as Tuesday's security update was based on
the version with this regression.

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Title:
  Regression: after Uprade from udev_237-3ubuntu10.25 to
  udev_237-3ubuntu10.26 network interfaces don't get renamed by 70
  -persistent-network.rules

Status in OEM Priority Project:
  In Progress
Status in systemd package in Ubuntu:
  In Progress

Bug description:
  [Impact]

   * Many server users upgraded from previous Ubuntu LTS series, such as
  14.04 and 16.04, will be affected by this regression.

   * Because there is /etc/udev/rules/70-persistent-network.rules or
  /etc/udev/rules.d/70-persistent-net.rules generated by
  /lib/udev/write_net_rules left.

   * The previous SRU commit of LP: #1837700 doesn't cover this
  persistent network rule.

  [Test Case]

   * It needs to have two Ethernet devices and provides
  /etc/udev/rules.d/70-persistent-net.rules as below.

  SUBSYSTEM=="net", ACTION=="add", ATTR{address}=="00:30:18:cb:5b:55", NAME="eth0"
  SUBSYSTEM=="net", ACTION=="add", ATTR{address}=="00:30:18:cb:5b:56", NAME="eth1"

  [Regression Potential]

   * When users upgrade to next LTS 20.04, they may also encounter this
  issue because Debian has dropped the same patch.

   * We need to figure another way to avoid this regression for next LTS
  20.04.

   * Adding back the origial patch from Debian will casue another issue.
  (LP: #1837700)

  [Other Info]

  Since the latest update from udev_237-3ubuntu10.25 and
  systemd_237-3ubuntu10.25 to udev_237-3ubuntu10.26 and
  systemd_237-3ubuntu10.26 the renaming of network interfaces by
  /etc/udev/rules/70-persistent-network.rules does not work.

  /etc/udev/rules/70-persistent-network.rules:
  SUBSYSTEM=="net", ACTION=="add", ATTR{address}=="00:30:18:cb:5b:55", NAME="eth0"
  SUBSYSTEM=="net", ACTION=="add", ATTR{address}=="00:30:18:cb:5b:56", NAME="eth1"

  /var/log/syslog:
  systemd-udevd[423]: Error changing net interface name 'eth1' to 'eth0': File exists

  When I downgrade the packages to the version with 237-3ubuntu10.25 the following messages are in /var/log/syslog:
  Sep  4 13:10:09 brutus kernel: [    4.518507] igb 0000:04:00.0 rename2: renamed from eth0
  Sep  4 13:10:09 brutus kernel: [    4.565081] igb 0000:07:00.0 eth0: renamed from eth1

  The latest version does not rename the interfaces temporary if there
  is a conflict!

  Manually installing the old packages with
  dpkg -i libacl1_2.2.52-3_amd64.deb libsystemd0_237-3ubuntu10.25_amd64.deb libudev1_237-3ubuntu10.25_amd64.deb systemd_237-3ubuntu10.25_amd64.deb systemd-sysv_237-3ubuntu10.25_amd64.deb udev_237-3ubuntu10.25_amd64.deb
  did fix the problem temporary.

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