Interestingly when running sudo ls, using the machine keytab, is works.
So looks for me the problem is somewhere in the user kerberos ticket.
Still this only happens with kernels released after 4.4.0-96

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https://bugs.launchpad.net/bugs/1725322

Title:
  kernel 4.4.0.97.102 breaks DFS

Status in Linux:
  Unknown
Status in linux package in Ubuntu:
  Confirmed

Bug description:
  OS: Ubuntu Desktop 16.04.3

  We connect to Windows DFS using automounter with our Linux 16.04
  workstations to let users access the windows shares. Until kernel
  version 4.4.0-96 this worked without any issues. However if a computer
  updates to kernel 4.4.0.97.102, using the same configs and samba
  version, it stops working and reports a "ls: cannot access xx: File
  name too long" error. (where xx is a foldername)

  Also if you run "ls -all" you will see:

  d????????? ? ?     ?               ?            ? Applications

  on the same computer selecting kernel 4.4.0.21.22 at grub menu:

  drwx--x--x 2 root  root            0 Oct 20 16:44 Applications

  Mount commando output (removed hostnames and IP numbers ) on computer
  with kernel 4.4.0.21.22

  //XXX/Public on /vol/winshare/Public type cifs
  
(rw,relatime,vers=1.0,sec=krb5,cache=strict,multiuser,uid=0,noforceuid,gid=0,noforcegid,addr=x.x.x.x
  
file_mode=0755,dir_mode=0755,nounix,mapposix,noperm,rsize=61440,wsize=65536,actimeo=1)

  Mount commando output (removed hostnames and IP numbers ) on the same
  computer with kernel 4.4.0.97.102

  //XXX/Public on /vol/winshare/Public type cifs
  
(rw,relatime,vers=1.0,sec=krb5,cache=strict,multiuser,uid=0,noforceuid,gid=0,noforcegid,addr=x.x.x.x,file_mode=0755,dir_mode=0755,nounix,mapposix,noperm,rsize=61440,wsize=65536,echo_interval=60,actimeo=1)

  During these tests the only thing that changed is the running kernel,
  no other changes were applied.

  autofs config file used for this connection

  Public   -fstype=cifs,sec=krb5,multiuser,nounix,noserverino
  ://<servername>/Public

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