** Bug watch added: Linux Kernel Bug Tracker #196891
   https://bugzilla.kernel.org/show_bug.cgi?id=196891

** Also affects: linux via
   https://bugzilla.kernel.org/show_bug.cgi?id=196891
   Importance: Unknown
       Status: Unknown

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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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