[Bug 1924794] Re: Getting error "ipconfig: no devices to configure" while trying to autoinstall in a VLAN env on s390x

[Michael Hudson-Doyle]

The part of this that doesn't make sense is "ip: can't find device
'encc000'" -- is that device just not appearing in time? It should be
chzdev activated just before the initramfs code tries to set up the
vlan, maybe it's a race? (is this behaviour consistent?). It's strange
that using the nic without a vlan works but there is a bit more time
(and a wait for udev, hmm) between the device getting chzdev-ed and used
in that case.

The code in initramfs-tools hasn't changed at all here between groovy
and hirsute so I don't know what's changed. We can always blame the
kernel I guess.

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Title:
  Getting error "ipconfig: no devices to configure" while trying to
  autoinstall in a VLAN env on s390x

Status in initramfs-tools:
  New
Status in subiquity:
  New
Status in Ubuntu on IBM z Systems:
  New
Status in casper package in Ubuntu:
  New

Bug description:
  Trying to autoinstall on a LPAR (that is connected to a VLAN
  environment) and using the 21.04 image from today (time stamp April
  16th) fails and to boot ends up with the following error message:

  
  BusyBox v1.30.1 (Ubuntu 1:1.30.1-6ubuntu2) built-in shell (ash)
  Enter 'help' for a list of built-in commands.
   
  (initramfs) [6n
  ip: SIOCGIFFLAGS: No such device
  ip: can't find device 'encc000'
  ipconfig: encc000.2653: SIOCGIFINDEX: No such device
  ipconfig: no devices to configure
  ipconfig: encc000.2653: SIOCGIFINDEX: No such device
  ipconfig: no devices to configure
  ipconfig: encc000.2653: SIOCGIFINDEX: No such device
  ipconfig: no devices to configure
  ipconfig: encc000.2653: SIOCGIFINDEX: No such device
  ipconfig: no devices to configure
  ipconfig: encc000.2653: SIOCGIFINDEX: No such device
  ipconfig: no devices to configure
  ipconfig: encc000.2653: SIOCGIFINDEX: No such device
  ipconfig: no devices to configure
  ipconfig: encc000.2653: SIOCGIFINDEX: No such device
  ipconfig: no devices to configure
  ipconfig: encc000.2653: SIOCGIFINDEX: No such device
  ipconfig: no devices to configure
  ipconfig: encc000.2653: SIOCGIFINDEX: No such device
  ipconfig: no devices to configure
  ipconfig: encc000.2653: SIOCGIFINDEX: No such device
  ipconfig: no devices to configure
  no search or nameservers found in /run/net-encc000.2653.conf /run/net-*.conf /ru
  n/net6-*.conf
  Connecting to installserver:80 (installserver:80)
  wget: can't connect to remote host (installserver): Network is unreachable
  Unable to find a live file system on the network

  So the network device encc000 and it related encc000.2653 is not
  automatically activated/enabled like it was in the past.

  It worked in the past with the same config I used today 
  ip=10.245.236.14::10.245.236.1:255.255.255.0:hostname:encc000.2653:none:10.245.236.1 vlan=encc000.2653:encc000 url=http://installserver:80/ubuntu-live-server-21.04/hirsute-live-server-s390x.iso autoinstall ds=nocloud-net;s=http://installserver:80/autoinstall/hostname/ --- quiet

  With "worked in the past" I mean it's already a while ago when I tried
  it last time - right now it does not seem to work with 21.04 and
  20.04.2 - BUT only on this particular environment where I have to
  specify the VLAN as kernel arg ("parm-file").

  It works in a different non VLAN environments (for example in a z/VM
  guest environment where I do NOT have to specify the VLAN at the
  autoistall config, since the VLAN is handled there by the z/VM
  vSwitch).

  Doing an interactive installation on this particular LPAR (incl.
  specifying the VLAN id) works fine!

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