Comment 36 for bug 1988119

The failure mode still exists if "udevadm trigger" has been issued before the package upgrade to systemd 237-3ubuntu10.55.

That is, if unattended-upgrades or the user had installed open-vm-tools, and has not rebooted yet, they will lose network connection on upgrade to 237-3ubuntu10.55.

We need to implement a way to add ID_NET_DRIVER back to the device before the systemd upgrade takes place, otherwise an outage will occur.

Release admins - DO NOT RELEASE systemd 237-3ubuntu10.55 yet.

Tagging block-proposed.

$ ping google.com
PING google.com (142.251.45.110) 56(84) bytes of data.
64 bytes from iad23s04-in-f14.1e100.net (142.251.45.110): icmp_seq=1 ttl=56 time=1.51 ms
64 bytes from iad23s04-in-f14.1e100.net (142.251.45.110): icmp_seq=2 ttl=56 time=1.35 ms
64 bytes from iad23s04-in-f14.1e100.net (142.251.45.110): icmp_seq=3 ttl=56 time=1.17 ms
^C
--- google.com ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2003ms
rtt min/avg/max/mdev = 1.172/1.349/1.516/0.140 ms
azureuser@mruffell-test:~$ sudo apt-cache policy systemd | grep Installed
  Installed: 237-3ubuntu10.53
azureuser@mruffell-test:~$ udevadm info /sys/class/net/eth0 | grep ID_NET_DRIVER
E: ID_NET_DRIVER=hv_netvsc
azureuser@mruffell-test:~$ sudo udevadm trigger
azureuser@mruffell-test:~$ ping google.com
PING google.com (142.251.45.110) 56(84) bytes of data.
64 bytes from iad23s04-in-f14.1e100.net (142.251.45.110): icmp_seq=1 ttl=56 time=2.15 ms
64 bytes from iad23s04-in-f14.1e100.net (142.251.45.110): icmp_seq=2 ttl=56 time=1.21 ms
^C
--- google.com ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1001ms
rtt min/avg/max/mdev = 1.212/1.682/2.152/0.470 ms
azureuser@mruffell-test:~$ udevadm info /sys/class/net/eth0 | grep ID_NET_DRIVER
azureuser@mruffell-test:~$ sudo apt install libnss-systemd libpam-systemd libsystemd0 libudev1 systemd systemd-sysv udev
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following package was automatically installed and is no longer required:
  linux-headers-4.15.0-191
Use 'sudo apt autoremove' to remove it.
Suggested packages:
  systemd-container
The following packages will be upgraded:
  libnss-systemd libpam-systemd libsystemd0 libudev1 systemd systemd-sysv udev
7 upgraded, 0 newly installed, 0 to remove and 8 not upgraded.
Need to get 4497 kB of archives.
After this operation, 8192 B of additional disk space will be used.
Get:1 http://ppa.launchpad.net/ubuntu-security-proposed/ppa/ubuntu bionic/main amd64 libsystemd0 amd64 237-3ubuntu10.55 [205 kB]
Get:2 http://ppa.launchpad.net/ubuntu-security-proposed/ppa/ubuntu bionic/main amd64 libnss-systemd amd64 237-3ubuntu10.55 [105 kB]
Get:3 http://ppa.launchpad.net/ubuntu-security-proposed/ppa/ubuntu bionic/main amd64 libpam-systemd amd64 237-3ubuntu10.55 [107 kB]
Get:4 http://ppa.launchpad.net/ubuntu-security-proposed/ppa/ubuntu bionic/main amd64 systemd amd64 237-3ubuntu10.55 [2915 kB]
Get:5 http://ppa.launchpad.net/ubuntu-security-proposed/ppa/ubuntu bionic/main amd64 udev amd64 237-3ubuntu10.55 [1099 kB]
Get:6 http://ppa.launchpad.net/ubuntu-security-proposed/ppa/ubuntu bionic/main amd64 libudev1 amd64 237-3ubuntu10.55 [54.2 kB]
Get:7 http://ppa.launchpad.net/ubuntu-security-proposed/ppa/ubuntu bionic/main amd64 systemd-sysv amd64 237-3ubuntu10.55 [12.0 kB]
Fetched 4497 kB in 3s (1461 kB/s)
(Reading database ... 77176 files and directories currently installed.)
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Setting up libnss-systemd:amd64 (237-3ubuntu10.55) ...
Setting up systemd-sysv (237-3ubuntu10.55) ...
Setting up udev (237-3ubuntu10.55) ...
update-initramfs: deferring update (trigger activated)
Setting up libpam-systemd:amd64 (237-3ubuntu10.55) ...
Processing triggers for libc-bin (2.27-3ubuntu1.6) ...
Processing triggers for man-db (2.8.3-2ubuntu0.1) ...
Processing triggers for dbus (1.12.2-1ubuntu1.3) ...
Processing triggers for ureadahead (0.100.0-21) ...
Processing triggers for initramfs-tools (0.130ubuntu3.13) ...
update-initramfs: Generating /boot/initrd.img-5.4.0-1089-azure
azureuser@mruffell-test:~$ ping google.com
ping: google.com: Temporary failure in name resolution
azureuser@mruffell-test:~$ udevadm info /sys/class/net/eth0 | grep ID_NET_DRIVER
azureuser@mruffell-test:~$