Public bug reported:

I'm using NFSv4 and FAI to install Ubuntu LTS. Currently I'm on 10.04
with the linux-lts-backport-oneiric kernel.

A week ago I have started to base a new release of our LiMux
distribution
(http://www.muenchen.de/Rathaus/dir/limux/english/index.html) on 12.04
and got NFSv4 access errors after mounting the NFSroot from the FAI
installation.

This is the last error from the NFSroot initramfs, before the kernels
"can't find init' panic:

run-init: /sbin/init: Not a directory

The origin of this error is commit 1788ea6e in the kernel git
repository:

nfs: when attempting to open a directory, fall back on normal lookup
(try #5)

It was fixed in v3.5-rc1 by commit 0ef97dcf

nfs: don't open in ->d_revalidate

I was able to fix this error by either porting 0ef97dcf + 16b1c1cd +
5ede7b1c to the precise kernel, or reverting 1788ea6e.

I would like to get the fix included into the Ubuntu kernel, so I don't
have to rebuild the kernel for every security update.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: linux-image-3.2.0-25-generic 3.2.0-25.40
ProcVersionSignature: Ubuntu 3.2.0-25.40-generic 3.2.18
Uname: Linux 3.2.0-25-generic i686
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
AplayDevices: Error: [Errno 2] No such file or directory
ApportVersion: 2.0.1-0ubuntu5
Architecture: i386
ArecordDevices: Error: [Errno 2] No such file or directory
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/by-path', 
'/dev/snd/controlC0', '/dev/snd/pcmC0D0c', '/dev/snd/pcmC0D0p', 
'/dev/snd/pcmC0D1c', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info: Error: [Errno 2] No such file or directory
Card0.Amixer.values: Error: [Errno 2] No such file or directory
Date: Wed Jul  4 08:44:06 2012
IwConfig: Error: [Errno 2] No such file or directory
Lsusb:
 Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
 Bus 001 Device 002: ID 80ee:0021 VirtualBox USB Tablet
MachineType: innotek GmbH VirtualBox
ProcEnviron:
 LANGUAGE=de_DE:de:en_GB:en
 TERM=linux
 PATH=(custom, no user)
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
ProcFB:
 
ProcKernelCmdLine: root=UUID=48a800b7-5834-4135-bb1e-ebd4fe451010 ro quiet 
splash
RelatedPackageVersions:
 linux-restricted-modules-3.2.0-25-generic N/A
 linux-backports-modules-3.2.0-25-generic  N/A
 linux-firmware                            1.79
RfKill: Error: [Errno 2] No such file or directory
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 12/01/2006
dmi.bios.vendor: innotek GmbH
dmi.bios.version: VirtualBox
dmi.modalias: 
dmi:bvninnotekGmbH:bvrVirtualBox:bd12/01/2006:svninnotekGmbH:pnVirtualBox:pvr1.2:
dmi.product.name: VirtualBox
dmi.product.version: 1.2
dmi.sys.vendor: innotek GmbH

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apport-bug i386 precise

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https://bugs.launchpad.net/bugs/1020870

Title:
  Any access to an NFSv4 based NFSroot fails with "Not a directory".

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