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[Launchpad Bug Tracker <1675086@xxxxxxxxxxxxxxxxxx>]

[Expired for linux (Ubuntu Xenial) because there has been no activity
for 60 days.]

** Changed in: linux (Ubuntu Xenial)
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/1675086

Title:
  Kernel Bug when using nfsroot + overlayroot at the same time

Status in linux package in Ubuntu:
  Expired
Status in linux source package in Xenial:
  Expired

Bug description:
  Hi,

  this affects version signature Ubuntu 4.4.0-21.37-generic 4.4.6 (as
  reported by initramfs), ARCH: amd64

  I have installed ubuntu 16.04 via debootstrap in a chroot environment.
  I can PXE boot this environment via NFS using the following Kernel
  parameters without a problem:

  root=/dev/nfs  initrd=initrd.gz nfsroot=10.23.23.1:/mnt/lab ip=dhcp ro

  (initramfs generated with 'mkinitramfs -v -o ~/initrd.img
  4.4.0-21-generic'. I can attach the  whole initramfs.conf, if desired)

  As soon as I enable overlayroot (using tmpfs as overlay target), the
  machine hangs at boot.

  In order to debug this issue, I have appended the

  break=init

  kernel parameter.

  In busybox I can then see that the overlay is mounted. However, if I try to chroot into it, I get a stacktrace (see attached screenshot).
  The overlay seems to be readable, but not writeable.

  ('touch file' works, but there is nothing there afterwards)

  `apport-collect` is not available in initramfs, therefore no log could
  be attached.

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