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[Launchpad Bug Tracker <1242713@xxxxxxxxxxxxxxxxxx>]

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I was testing upgrading some computers to 12.04.3 (with the LTS raring
kernel - 3.8.0) and came across a problem with NFSv3/ACLs and KRB5
security. Any access to the NFS mounted filesystem that tries to access
the access control list (ACL) hangs.

The NFS server is running 12.04.3 with the normal 3.2.0 kernel.

I mount the filesystem using:

mount -o nfsvers=3,tcp,sec=krb5 fileserver:/export/home /home

and it mounts fine.
Afterwards though, if you try and do something simple such as an 'ls -l /home' then it hangs. Using strace to see why the ls -l hangs reveals that it is hanging at 

.....
lstat("/home/student", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
lgetxattr("/home/student", "security.selinux", 0xc77ea0, 255) = -1 EOPNOTSUPP (Operation not supported)
lgetxattr("/home/student", "system.posix_acl_access"

It all works fine if you either use the "noacl" mount option or remove
the "sec=krb5" mount option.

I have tried using 13.04 as the client and it has the same problem. I
can also confirm that the problem exists with using the LTS raring
kernel on the server. The LTS quantal kernel (3.5.0) as the client works
fine.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: nfs-common 1:1.2.5-3ubuntu3.1
ProcVersionSignature: Ubuntu 3.2.0-54.82-generic 3.2.50
Uname: Linux 3.2.0-54-generic x86_64
ApportVersion: 2.0.1-0ubuntu17.5
Architecture: amd64
Date: Mon Oct 21 14:37:02 2013
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
MarkForUpload: True
SourcePackage: nfs-utils
UpgradeStatus: No upgrade log present (probably fresh install)

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


** Tags: amd64 apport-bug precise
-- 
NFSv3 hangs when using ACLs and KRB5 with linux-image-generic-lts-raring
https://bugs.launchpad.net/bugs/1242713
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