[Bug 1631474] Re: No networking with initramfs-tools 0.122ubuntu8.3 and ip=dhcp boot option

[Jason Gerard DeRose]

As asked by chiluk on IRC, here's my PXE boot configuration (well,
representative one anyway, the exact kernel version will obviously
change):

DEFAULT ubuntu
LABEL ubuntu
LINUX vmlinuz-4.4.0-36-generic
APPEND initrd=initrd.img-4.4.0-36-generic root=/dev/nfs nfsroot=10.17.76.1:/var/lib/tribble/ephemeral ip=dhcp ro nomodeset net.ifnames=0
IPAPPEND 2

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Title:
  No networking with initramfs-tools 0.122ubuntu8.3 and ip=dhcp boot
  option

Status in initramfs-tools package in Ubuntu:
  In Progress
Status in initramfs-tools source package in Xenial:
  New

Bug description:
  initramfs-tools 0.122ubuntu8.3 introduced a serious regression where
  networking is not initialized when the boot option "ip=dhcp" is
  provided. We are seeing this problem in AWS, but cannot confirm if
  this issue is specific to AWS or will occur with different hardware or
  in different environments.

  Removing "ip=dhcp" from the boot options with 0.122ubuntu8.3 results
  in networking being configured.

  The issue does not occur with 0.122ubuntu8.2 or previous versions when
  "ip=dhcp" is set.

  AWS has no console so debugging is not a trivial task. I do have a
  console log with some output, and will update this bug shortly with
  it.

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