[Bug 1811348] Re: ubuntu server 18.04.1 session hangs when updating systemd via ssh session via a route configured by policy routing

[Dan Streetman]

please reopen if this is still an issue

** Changed in: systemd (Ubuntu)
       Status: New => Invalid

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Title:
  ubuntu server 18.04.1 session hangs when updating systemd via ssh
  session via a route configured by policy routing

Status in systemd package in Ubuntu:
  Invalid

Bug description:
  I have installed ubuntu server 18.04 on one of my machines.
  I can access the machine only via ssh.

  Typically, I run these commands from time to time:

  - ssh root@{machine}
  - apt-get update
  - apt-get upgrade

  I observed at least two times now that "apt-get upgrade" doesn't complete. It hangs
  on this:

    ...
    Vorbereitung zum Entpacken von .../libudev1_237-3ubuntu10.11_amd64.deb ...
    Entpacken von libudev1:amd64 (237-3ubuntu10.11) über (237-3ubuntu10.9) ...
    libudev1:amd64 (237-3ubuntu10.11) wird eingerichtet ...
    systemd (237-3ubuntu10.11) wird eingerichtet ...

  The ssh session becomes unresponsive.

  I am not able to ssh from my desktop into the machine again.
  I have to ssh into a neighbor of the machine running within the same subnet. From that, I
  could ssh into the machine and run "netplan apply". Afterwards, everything is fine.

  Please note that I do use policy routing.

  Before "netplan apply":
    root at samson:~# ip rule list
    0:	from all lookup local 
    32766:	from all lookup main 
    32767:	from all lookup default 

  After "netplan apply":
    root at samson:~# ip rule list
    0:	from all lookup local 
    0:	from {ip-address} lookup 120 
    0:	from all to {ip-address} lookup 120 
    32766:	from all lookup main 
    32767:	from all lookup default

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