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  default vers value when mounting cifs shares with mount.cifs not

Status in linux package in Ubuntu:

Bug description:
  Firstly, apologies if this isn't a bug in cifs.mount - I know it's
  intimitly connected to a recent kernel updates which changed the
  default SMB version cifs connects with, but I'm having trouble
  distinguishing whether this behaviour is caused by the kernel change
  or a problem with cifs.

  On a recently built 16.04.3 LTS box with kernel 4.4.0-109, I was able
  to mount to a network DFS share with the following

  mount.cifs -o user=username //pathto/share /mountpoint

  and after doing so, I was able to navigate through the mounted share,
  and through the underlying DFS structure with no problems.  The mount
  command notably contained 'vers=1.0' - which was expected.

  After updating the kernel to, if I run the same command, the
  share appears to mount, but I get a 'cannot access ...: Input/Output
  error' when trying to move through a DFS mount within the mounted

  Notably, the output from the mount command has 'vers=default'.

  I understand from various sources, that the default SMB vers is now
  3.0 - and if I mount this share explicitly with

  mount.cifs -o user=username,vers=3.0 //pathto/share /mountpoint

  Then I see 'vers=3' on the output from mount, and am able to use the
  share as expected.

  The man page for the cifs.mount cmd still says the default is SMB1.0
  (this appeared to be the case with a kernel previous to 4.13).  The
  kernel sources now say the default is SMB 3.0 - which would also be
  find, if the share is mounted with vers=3.0.

  But instead I'm seeing 'vers=default' - and I'm unsure as to what
  version of SMB it's actually trying to use (if any) - whatever it is,
  it doesn't work unless I explicitly set vers=3.0.


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