Public bug reported:

On a Xenial installation after upgrading to the HWE 4.13.0-32-generic
kernel it is not possible to use mount.cifs with -o vers=x.y different
than 1.0.

Steps to reproduce:
1. Setup a local Samba share.
2. Run:
mount.cifs -o user=<myuser>,vers=2.0 //localhost/theshare/ /mnt/theshare
(please note that not specifying the vers= option results in using protocol 
SMB2.1 which also results in the error).
3. This may be repeated for the following versions: 2.0, 2.1, 3.0.

Expected result:
The share gets mounted at /mnt/theshare.

Actual result:
The share is not mounted, this gets printed in the console (and in dmesg):
[  232.439162] CIFS VFS: ioctl error in smb2_get_dfs_refer rc=-2

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


** Tags: sts

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https://bugs.launchpad.net/bugs/1746482

Title:
  mount.cifs stopped working with protocol version != 1.0

Status in linux package in Ubuntu:
  New

Bug description:
  On a Xenial installation after upgrading to the HWE 4.13.0-32-generic
  kernel it is not possible to use mount.cifs with -o vers=x.y different
  than 1.0.

  Steps to reproduce:
  1. Setup a local Samba share.
  2. Run:
  mount.cifs -o user=<myuser>,vers=2.0 //localhost/theshare/ /mnt/theshare
  (please note that not specifying the vers= option results in using protocol 
SMB2.1 which also results in the error).
  3. This may be repeated for the following versions: 2.0, 2.1, 3.0.

  Expected result:
  The share gets mounted at /mnt/theshare.

  Actual result:
  The share is not mounted, this gets printed in the console (and in dmesg):
  [  232.439162] CIFS VFS: ioctl error in smb2_get_dfs_refer rc=-2

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