[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

[Rex Tsai]

The user will have a 70-persistent-net.rules generated by
/lib/udev/write_net_rules, when they upgraded from 14.04/12.04 to newer
version. The server user may have the iptables rules or netowrk ip
setting based on the persistent interface name. This is critical.

The regression is introduced in 237-3ubuntu10.26.

If we don't have a quick solution to support both 70-persistent-
net.rules and same mac address.

We should quickly revert the changes back to the original version.

[1] 237-3ubuntu10.26 : systemd package : Ubuntu - https://launchpad.net/ubuntu/+source/systemd/237-3ubuntu10.26
[2] Bug #1837700 “Dell system takes a long time to connect network w...” : Bugs : systemd package : Ubuntu - https://bugs.launchpad.net/bugs/1837700

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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:
  Confirmed

Bug description:
  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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