If this hangs in an lsgetxattr() syscall with the raring kernel but not
when using the quantal kernel with the same userspace, then I think this
is clearly a kernel issue. Reassigning.
FWIW I never saw this issue here with the raring kernel, but all of my
krb5 NFS mounts are v4.
** Package changed: nfs-utils (Ubuntu) => linux (Ubuntu)
** Also affects: linux-lts-raring (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1242713
Title:
NFSv3 hangs when using ACLs and KRB5 with linux-image-generic-lts-
raring
Status in “linux” package in Ubuntu:
Incomplete
Status in “linux-lts-raring” package in Ubuntu:
New
Bug description:
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)
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