apport information

** Attachment added: "ProcEnviron.txt"

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  CIFS acesses DFS referral with wrong Kerberos ticket

Status in linux package in Ubuntu:

Bug description:
  kubuntu 19.10 with kernel 5.3.0-29-generic and64.

  This looks like a regression in the kernel CIFS module after the 4.15 & 5.0 
  These earlier kernels follow the DFS referrals without error.

  The problem:
  - Use mount.cifs with kerberos authentication to mount a samba server hosting 
a DFS root.
    You will get a KRB ticket for the "dfs_root" machine.
  - Attempt to access a host a host via a DFS referral (call this "target_host")
  - Access will fail with "Permission Denied".
  - Use Wireshark to monitor CIFS and KRB traffic.
  - The kernel attempts to authenticate to "target_host" using the KRB ticket 
for "dfs_root".
   - A DFS target running Win2008R2 will reply with 
     kernel will get a KRB ticket for "target_host" and use it.
     The connection is then successful.
   - A DFS target running Samba 4.7.6 will reply with STATUS_LOGON_FAILURE.
     The connection fails.

  Expected Result:
  - Successful connection.
  - The kernel should get a KRB ticket for "target_host" and use it.
    (This is what kernels 4.15 and 5.0 do [and a Windows client])
  ProblemType: Bug
  ApportVersion: 2.20.11-0ubuntu8.2
  Architecture: amd64
   /dev/snd/controlC3:  stephen    1839 F.... pulseaudio
   /dev/snd/controlC2:  stephen    1839 F.... pulseaudio
   /dev/snd/controlC0:  stephen    1839 F.... pulseaudio
   /dev/snd/controlC1:  stephen    1839 F.... pulseaudio
  CurrentDesktop: KDE
  DistroRelease: Ubuntu 19.10
  HibernationDevice: RESUME=UUID=4df5ccea-5eb4-45e3-a0b0-7b1311fdaba5
  InstallationDate: Installed on 2018-11-09 (459 days ago)
  InstallationMedia: Kubuntu 18.10 "Cosmic Cuttlefish" - Release amd64 
  MachineType: Gigabyte Technology Co., Ltd. GA-MA790X-UD4P
  NonfreeKernelModules: nvidia_modeset nvidia
  Package: linux (not installed)
  ProcFB: 0 VESA VGA
  ProcKernelCmdLine: BOOT_IMAGE=/@/boot/vmlinuz-5.3.0-29-generic 
root=UUID=f009da0b-176e-49e6-a6a0-bb594e6754a8 ro rootflags=subvol=@
  ProcVersionSignature: Ubuntu 5.3.0-29.31-generic 5.3.13
   linux-restricted-modules-5.3.0-29-generic N/A
   linux-backports-modules-5.3.0-29-generic  N/A
   linux-firmware                            1.183.3
  Tags:  eoan
  Uname: Linux 5.3.0-29-generic x86_64
  UpgradeStatus: Upgraded to eoan on 2019-10-20 (114 days ago)
  UserGroups: adm bacula cdrom kvm libvirt lpadmin plugdev sambashare sudo 
  _MarkForUpload: True 09/08/2010
  dmi.bios.vendor: Award Software International, Inc.
  dmi.bios.version: F10c GA-MA790X-UD4P
  dmi.board.vendor: Gigabyte Technology Co., Ltd.
  dmi.board.version: x.x
  dmi.chassis.type: 3
  dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
dmi:bvnAwardSoftwareInternational,Inc.:bvrF10c:bd09/08/2010:svnGigabyteTechnologyCo.,Ltd.:pnGA-MA790X-UD4P:pvr:rvnGigabyteTechnologyCo.,Ltd.:rnGA-MA790X-UD4P:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr: GA-MA790X-UD4P
  dmi.sys.vendor: Gigabyte Technology Co., Ltd.

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