[Bug 1766872] Re: 'Enable Network' in recovery mode not working in Bionic

[Bougron]

Hello

My ubuntu version is 18.04.1

cat /etc/lsb*
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=18.04
DISTRIB_CODENAME=bionic
DISTRIB_DESCRIPTION="Ubuntu 18.04.1 LTS"


It works very well. But thinking that someday, this could not be the case, I decided to check if the recovery mode works

function "fsck" works
function "dpg" works
but function "enable network support" hangs.
dmesg | grep vmlinuz
[    0.000000] Command line: \\boot\vmlinuz-4.15.0-32-generic recovery root=UUID=cb50473a-5d9c-441a-9502-690c1c8684d6 ro initrd=\boot\initrd.img-4.15.0-32-generic   
[    0.000000] Kernel command line: \\boot\vmlinuz-4.15.0-32-generic recovery root=UUID=cb50473a-

it is necessary to press the ctrl c keys to unlock the situation.

(checked with two different computers.

Attachment: contents of the start trace

** Attachment added: "dmesg trace"
   https://bugs.launchpad.net/ubuntu/+source/friendly-recovery/+bug/1766872/+attachment/5177864/+files/TRACE.txt

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https://bugs.launchpad.net/bugs/1766872

Title:
  'Enable Network' in recovery mode not working in Bionic

Status in friendly-recovery package in Ubuntu:
  Confirmed
Status in systemd package in Ubuntu:
  Won't Fix

Bug description:
  This bug has been noticed after the introduction of the fix of (LP:
  #1682637) in Bionic.

  I have notice a block in Bionic when choosing 'Enable Network' option
  in recovery mode on different bionic vanilla system and I can
  reproduce all the time.

  I also asked colleagues to give it a try (for a second pair of eye on
  this) and they have the same result as me.

  Basically, when choosing 'Enable Network' it get block or lock.
  If we hit 'ctrl-c', then a shell arrive and the system has network connectivity.

  Here's what I find while enabling "systemd.debug-shell=1" from vtty9 :

  # pstree
  systemd-+-bash---pstree
          |-recovery-menu---network---systemctl---systemd-tty-ask
          |-systemd-journal
          ....

  # ps
  root 486 473 0 08:29 tty1 00:00:00 /bin/systemd-tty-ask-password-agent

  root 473 486 0 08:29 tty1 00:00:00 systemctl start dbus.socket

  root 486 283 0 08:29 tty1 00:00:00 /bin/sh /lib/recovery-
  mode/options/network

  Additionally,

  systemd-analyze blame:
  "Bootup is not yet finished. Please try again later"

  "systemctl list-jobs" is showing a 100 jobs in 'waiting' state

  The only 'running' unit is friendly-recovery.service :
  52 friendly-recovery.service                 start running

  The rest are all "waiting". My understanding is that "waiting" units
  will be executed only after those which are "running" are completed.
  Which explain why the "ctlr-c" allow the boot to continue.

  All the systemd special unit important at boot-up are waiting.
  7 sysinit.target                 start waiting
  3 basic.target                   start waiting
  .....

  Seems like systemd is not fully initialise in 'Recovery Mode' and
  doesn't allow any 'systemctl start' operation without
  password/passphrase request, which I suspect is hidden by the
  recovery-mode menu.

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