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[Jens Elkner <jel+ubuntu@xxxxxxxxxx>]

Haven't tried, but found a way to fix it myself. In general the problem
is, that Ubuntu still uses a setup/environment, which looks like ~15
years ago - all the bogus klibc/busybox pain! I mean, I want to boot a
workstation, not my dish washer!

In detail one problem seems, that Ubuntu uses the buggy /bin/losetup, and not the working version provided as /sbin/losetup. Furthermore the /bin/run-init seems to be bogus.
I replaced it with http://code.metager.de/source/raw/opensuse/mkinitrd/src/run-init.c and finally got nfs boot working.

To get a clue, what we do exactly, have a look at: http://iws.cs.uni-magdeburg.de/~elkner/tmp/ubuntu/
The setupUbuntuPXE.sh  (entry point) is used to fetch the ISO, setup PXE and mangle the initrd image
on the PXE server.

Note, that we currently force TORAM for nfs root, because without it
Ubuntu stops working after a while (looks like, when the client becomes
idle for a certain time, trouble starts - I guess, buggy squash/unionfs
implementation ...).

-- 
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https://bugs.launchpad.net/bugs/1355010

Title:
  ernel panic - not syncing: Attempted to kill init! exitcode=0x00000100

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  We are trying to provide Ubuntu desktop (ubuntu-14.04.1-desktop-amd64.iso) to our labs for studs, which just wanna give it a try.
  Unfortunately it doesn't work: If it tries to exec the final step (e.g.  run-init /root /sbin/init textonly toram  </root/dev/console >/root/dev/console 2>&1) it panics:

  [  320.076015] Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000100
  [  320.076015]
  [  320.085145] CPU: 25 PID: 1 Comm: run-init Not tainted 3.13.0-32-generic #57-Ubuntu
  [  320.092709] Hardware name: WBS F224A-DE5/X9DRH-iF, BIOS 3.0b 04/28/2014
  [  320.099315]  ffff883fce017380 ffff881fd31cde78 ffffffff8171bcb4 ffffffff81a4e5e8
  [  320.106792]  ffff881fd31cdef0 ffffffff81714eb5 ffffffff00000010 ffff881fd31cdf00
  [  320.114271]  ffff881fd31cdea0 ffffffff81f239e0 0000000000000100 ffff883fd2d60398
  [  320.121750] Call Trace:
  [  320.124215]  [<ffffffff8171bcb4>] dump_stack+0x45/0x56
  [  320.129360]  [<ffffffff81714eb5>] panic+0xc8/0x1d7
  [  320.134158]  [<ffffffff8106a3a1>] do_exit+0xa41/0xa50
  [  320.139213]  [<ffffffff81020d45>] ? syscall_trace_enter+0x145/0x250
  [  320.145474]  [<ffffffff8106a3e7>] SyS_exit+0x17/0x20
  [  320.150442]  [<ffffffff8172c87f>] tracesys+0xe1/0xe6

  I've no clue, what the problem could be. Already tried to append
  kernel params 'selinux=0 apparmor=0 enforcig=0' but without success :(

  The /root fs seems to be properly populated (overlayfs).

  Any hints?
  --- 
  ApportVersion: 2.14.1-0ubuntu3.2
  Architecture: amd64
  BootDmesg: (Nothing has been logged yet.)
  CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 not found.
  CasperVersion: 1.340
  DistroRelease: Ubuntu 14.04
  LiveMediaBuild: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  Lsusb:
   Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
   Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
   Bus 001 Device 003: ID 0557:2221 ATEN International Co., Ltd Winbond Hermon
   Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: WBS F224A-DE5
  Package: linux (not installed)
  ProcEnviron:
   TERM=linux
   PATH=(custom, no user)
  ProcFB:
   
  ProcKernelCmdLine: BOOT_IMAGE=http://141.44.24.61/boot/hostname-14.04.1-desktop-amd64/vmlinuz root=/dev/nfs netboot=nfs nfsroot=141.44.24.61:/data/mnt/hostname-14.04.1-desktop-amd64 boot=casper locale=de_DE.UTF-8 pw=$6$7CPMoOcQ$n3dtobqEnQrvJwQUKI/CoowOFI9AyUyf9I1eGY0.WK0s.PeuYpnQcVcsxt/6gN8ksJ7U2wSgAr0yavpDv4CH.0 textonly console=ttyS1,115200 debug selinux=0 apparmor=0 enforcing=0 break=init toram initrd=http://141.44.24.61/boot/hostname-14.04.1-desktop-amd64/initrd.lz BOOTIF=01-68-05-ca-0a-49-be
  ProcVersionSignature: Ubuntu 3.13.0-32.57-generic 3.13.11.4
  PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-32-generic N/A
   linux-backports-modules-3.13.0-32-generic  N/A
   linux-firmware                             1.127.5
  RfKill:
   
  Tags:  trusty
  UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
  Uname: Linux 3.13.0-32-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:
   
  WifiSyslog:
   
  _MarkForUpload: True
  dmi.bios.date: 04/28/2014
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 3.0b
  dmi.board.asset.tag: 0672042101108
  dmi.board.name: X9DRH-iF
  dmi.board.vendor: Supermicro
  dmi.board.version: 1.02
  dmi.chassis.asset.tag: 0672042071494
  dmi.chassis.type: 23
  dmi.chassis.vendor: Supermicro
  dmi.chassis.version: CSE-216BA-R920LPB
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr3.0b:bd04/28/2014:svnWBS:pnF224A-DE5:pvr3.0:rvnSupermicro:rnX9DRH-iF:rvr1.02:cvnSupermicro:ct23:cvrCSE-216BA-R920LPB:
  dmi.product.name: F224A-DE5
  dmi.product.version: 3.0
  dmi.sys.vendor: WBS

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