[Bug 1782709] Re: Updating systemd kills network on bionic

[DEXTER]

I could only resolve the ssh issue with killing the apt process, and restarted networking.
This is a pretty bad issue imho. Upgrading packages through ssh should not disconnect the session, but even if it is, upgrading the systemd package should not result in not being able to log back in ever again!

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Title:
  Updating systemd kills network on bionic

Status in linux package in Ubuntu:
  Incomplete
Status in systemd package in Ubuntu:
  New

Bug description:
  I do have an ubuntu bionic server installation without a graphical interface. The server
  has two active network adapters, both connected to the internet. One is used for outgoing
  internet traffic, the other for incoming. The incoming adapter lives on a public network segment
  (something like 88.236.133.104/29). I do have multiple servers within this segment.

  Typically, I update the server regularly, meaning:

  * ssh to the incoming adapter: ssh 88.236.133.108
  * apt-get update
  * apt-get upgrade
  * apt-get dist-upgrade
  * apt-get clean
  * reboot

  It used to work ok.

  BUT: Today, "apt-get upgrade" seem to take really long when updating systemd.
  After a could of minutes, I realized that the ssh session became inactive. I couldn't type
  into it, I had to abort it via ~. .

  * ssh from the internet to the incoming adapter was not working anymore - ssh 88.236.133.108
  * ssh via another server within the public network segment worked
      * ssh 88.236.133.106 -> ssh 88.236.133.108
  * After running "netplan apply" everything was fine again

  Here my netplan configuration (I changed the ip addresses):

  network:
    version: 2
    renderer: networkd
    ethernets:
      eno1:
        dhcp4: yes
      eno2:
        dhcp4: no
        addresses: [88.236.133.108/29]
        #gateway4: 88.236.133.105
        routes:
         - to: 0.0.0.0/0
           via: 88.236.133.105
           table: 120
        routing-policy:
         - from: 88.236.133.108/32
           table: 120
         - to: 88.236.133.108/32
           table: 120

  Unfortunately, I don't have the console output avalable anymore.
  Shall I provide additional info?

  Best regards, Uli
  --- 
  ProblemType: Bug
  AlsaDevices:
   total 0
   crw-rw---- 1 root audio 116,  1 Jul 20 08:10 seq
   crw-rw---- 1 root audio 116, 33 Jul 20 08:10 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
  ApportVersion: 2.20.9-0ubuntu7.2
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
  DistroRelease: Ubuntu 18.04
  InstallationDate: Installed on 2018-07-14 (5 days ago)
  InstallationMedia: Ubuntu-Server 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
  MachineType: IBM IBM System x -[794582G]-
  Package: linux (not installed)
  PciMultimedia:
   
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=de_DE.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 mgadrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.15.0-23-generic root=UUID=a41b3020-8359-4fe2-8fc3-1c97011f71ec ro
  ProcVersionSignature: Ubuntu 4.15.0-23.25-generic 4.15.18
  RelatedPackageVersions:
   linux-restricted-modules-4.15.0-23-generic N/A
   linux-backports-modules-4.15.0-23-generic  N/A
   linux-firmware                             1.173.1
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill': 'rfkill'
  Tags:  bionic
  Uname: Linux 4.15.0-23-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:
   
  _MarkForUpload: True
  dmi.bios.date: 05/07/2014
  dmi.bios.vendor: IBM Corp.
  dmi.bios.version: -[D6E162AUS-1.20]-
  dmi.board.asset.tag: (none)
  dmi.board.name: 00D4062
  dmi.board.vendor: IBM
  dmi.board.version: (none)
  dmi.chassis.asset.tag: none
  dmi.chassis.type: 23
  dmi.chassis.vendor: IBM
  dmi.chassis.version: none
  dmi.modalias: dmi:bvnIBMCorp.:bvr-[D6E162AUS-1.20]-:bd05/07/2014:svnIBM:pnIBMSystemx-[794582G]-:pvr00:rvnIBM:rn00D4062:rvr(none):cvnIBM:ct23:cvrnone:
  dmi.product.family: System x
  dmi.product.name: IBM System x -[794582G]-
  dmi.product.version: 00
  dmi.sys.vendor: IBM

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