Public bug reported:
On Ubuntu 22.04.3 LTS (jammy jellyfish) we mount a DFS file service
using CIFS with kerberos authentication. After the kernel upgrade from
5.15.0-86-generic to 5.15.0-88-generic (exact version: 5.15.0-88.98)
this stopped working. The mount seems to have worked, but files and
directories are inaccessible. A non-DFS CIFS share mounted on the same
client machine is not affected.
In our case the filesystem is mounted using autofs with the following mapping:
/dfs-share -fstype=cifs,sec=krb5,vers=3,multiuser,noserverino
://example.com/share
Kernel log messages:
CIFS: Attempting to mount \\example.com\share
CIFS: VFS: BAD_NETWORK_NAME: \\example.com\share
CIFS: VFS: Verify user has a krb5 ticket and keyutils is installed
CIFS: VFS: \\CLx-Ny.EXAMPLE.COM Send error in SessSetup = -126
We confirmed that kernel version 5.15.0-88 causes this by booting
different kernel versions repeatedly. When booting 5.15.0-86 everything
worked properly as before.
Though not familiar with kernel coding, we found changes in the source
code that seem to confirm that some code dealing with DFS has changed,
moved, or removed.
After:
git clone git://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/jammy
This:
git diff Ubuntu-5.15.0-86.96 Ubuntu-5.15.0-88.98 -- fs/cifs/cifs_dfs_ref.c
This suggests the function cifs_dfs_do_mount() has been (re)moved.
** Affects: linux-signed (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2043118
Title:
Regression CIFS mounted DFS
Status in linux-signed package in Ubuntu:
New
Bug description:
On Ubuntu 22.04.3 LTS (jammy jellyfish) we mount a DFS file service
using CIFS with kerberos authentication. After the kernel upgrade
from 5.15.0-86-generic to 5.15.0-88-generic (exact version:
5.15.0-88.98) this stopped working. The mount seems to have worked,
but files and directories are inaccessible. A non-DFS CIFS share
mounted on the same client machine is not affected.
In our case the filesystem is mounted using autofs with the following mapping:
/dfs-share -fstype=cifs,sec=krb5,vers=3,multiuser,noserverino
://example.com/share
Kernel log messages:
CIFS: Attempting to mount \\example.com\share
CIFS: VFS: BAD_NETWORK_NAME: \\example.com\share
CIFS: VFS: Verify user has a krb5 ticket and keyutils is installed
CIFS: VFS: \\CLx-Ny.EXAMPLE.COM Send error in SessSetup = -126
We confirmed that kernel version 5.15.0-88 causes this by booting
different kernel versions repeatedly. When booting 5.15.0-86
everything worked properly as before.
Though not familiar with kernel coding, we found changes in the source
code that seem to confirm that some code dealing with DFS has changed,
moved, or removed.
After:
git clone
git://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/jammy
This:
git diff Ubuntu-5.15.0-86.96 Ubuntu-5.15.0-88.98 -- fs/cifs/cifs_dfs_ref.c
This suggests the function cifs_dfs_do_mount() has been (re)moved.
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