DFS entries are accessible with kernel 5.10.0-1023-oem from proposed
(package: linux-image-5.10.0-1023-oem, version: 5.10.0-1023.24).

I could not find the docu for managing tags, so lets see if this works

** Tags added: verification-done-focal

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https://bugs.launchpad.net/bugs/1923670

Title:
  CIFS DFS entries not accessible with 5.4.0-71.74-generic

Status in linux package in Ubuntu:
  Confirmed
Status in linux-oem-5.10 package in Ubuntu:
  Confirmed
Status in linux source package in Focal:
  Fix Committed
Status in linux-oem-5.10 source package in Focal:
  Fix Committed

Bug description:
  When booting 5.4.0-71-generic I can not access DFS entries anymore,
  with 5.4.0-70-generic this still works. Some details:

  fstab entry:

  //example.com/public /home/user/remote    cifs
  
noauto,vers=default,noserverino,users,_netdev,user=remote_user,domain=example.com
  0    0

  shell session
  ~$ mount /home/user/remote
  Password for remote_user@//example.com/public:
  ~$ ls /home/user/remote/dfs-folder
  dfs-subfolder dfs-entry
  ~$ ls /home/user/remote/dfs-folder/dfs-entry
  ls: cannot access '/home/user/remote/dfs-folder/dfs-entry': No such file or 
directory

  dmesg excerpt
  [ 1219.568778] CIFS: Attempting to mount 
//DC01.example.com/Public/dfs-folder/dfs-entry
  [ 1219.584975] FS-Cache: Duplicate cookie detected
  [ 1219.584986] FS-Cache: O-cookie c=000000006e995395 [p=00000000f4725c61 
fl=222 nc=0 na=1]
  [ 1219.584990] FS-Cache: O-cookie d=00000000a11c1428 n=0000000071ab21ba
  [ 1219.584993] FS-Cache: O-key=[6] '5075626c6963'
  [ 1219.585001] FS-Cache: N-cookie c=00000000a0608786 [p=00000000f4725c61 fl=2 
nc=0 na=1]
  [ 1219.585004] FS-Cache: N-cookie d=00000000a11c1428 n=00000000901f6a53
  [ 1219.585007] FS-Cache: N-key=[6] '5075626c6963'
  [ 1219.725834] FS-Cache: Duplicate cookie detected
  [ 1219.725847] FS-Cache: O-cookie c=000000006e995395 [p=00000000f4725c61 
fl=222 nc=0 na=1]
  [ 1219.725851] FS-Cache: O-cookie d=00000000a11c1428 n=0000000071ab21ba
  [ 1219.725854] FS-Cache: O-key=[6] '5075626c6963'
  [ 1219.725864] FS-Cache: N-cookie c=000000000509709f [p=00000000f4725c61 fl=2 
nc=0 na=1]
  [ 1219.725868] FS-Cache: N-cookie d=00000000a11c1428 n=00000000556f158b
  [ 1219.725870] FS-Cache: N-key=[6] '5075626c6963'
  [ 1220.216524] CIFS VFS: cifs_read_super: get root inode failed

  The dmesg from 5.4.0-70-generic does not have the line
  CIFS VFS: cifs_read_super: get root inode failed

  
  ~$ lsb_release -rd
  Description:    KDE neon User Edition 5.21
  Release:   ~$ lsb_release -rd
  Description:    KDE neon User Edition 5.21
  Release:        20.04
       20.04
  ~$ apt-cache policy linux-image-generic
  linux-image-generic:
    Installed: 5.4.0.71.74
    Candidate: 5.4.0.71.74
    Version table:
   *** 5.4.0.71.74 500
          500 http://de.archive.ubuntu.com/ubuntu focal-updates/main amd64 
Packages
          500 http://security.ubuntu.com/ubuntu focal-security/main amd64 
Packages
          100 /var/lib/dpkg/status
       5.4.0.26.32 500
          500 http://de.archive.ubuntu.com/ubuntu focal/main amd64 Packages
  --- 
  ProblemType: Bug
  ApportVersion: 2.20.11-0ubuntu27.16
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC2:  dirk       2946 F.... pulseaudio
   /dev/snd/controlC1:  dirk       2946 F.... pulseaudio
   /dev/snd/controlC0:  dirk       2946 F.... pulseaudio
  CasperMD5CheckResult: skip
  CurrentDesktop: KDE
  DistroRelease: KDE neon 20.04
  InstallationDate: Installed on 2017-07-27 (1356 days ago)
  InstallationMedia: neon userlts "Xenial" - Build amd64 LIVE Binary 
20170614-00:52
  MachineType: LENOVO 20HMS00T00
  Package: linux (not installed)
  ProcFB: 0 i915drmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.4.0-71-generic 
root=/dev/mapper/vg00-lv_root ro intel_iommu=off
  ProcVersionSignature: Ubuntu 5.4.0-71.79-generic 5.4.101
  RelatedPackageVersions:
   linux-restricted-modules-5.4.0-71-generic N/A
   linux-backports-modules-5.4.0-71-generic  N/A
   linux-firmware                            1.187.10
  Tags:  focal
  Uname: Linux 5.4.0-71-generic x86_64
  UnreportableReason: In diesem Bericht geht es um ein Paket, welches nicht 
installiert ist.
  UpgradeStatus: Upgraded to focal on 2020-11-22 (142 days ago)
  UserGroups: adm cdrom davfs2 dialout dip kvm libvirt lpadmin plugdev roccat 
sambashare scanner sudo vboxusers
  _MarkForUpload: False
  dmi.bios.date: 04/20/2020
  dmi.bios.vendor: LENOVO
  dmi.bios.version: R0IET61W (1.39 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20HMS00T00
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Defined
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: None
  dmi.modalias: 
dmi:bvnLENOVO:bvrR0IET61W(1.39):bd04/20/2020:svnLENOVO:pn20HMS00T00:pvrThinkPadX270:rvnLENOVO:rn20HMS00T00:rvrNotDefined:cvnLENOVO:ct10:cvrNone:
  dmi.product.family: ThinkPad X270
  dmi.product.name: 20HMS00T00
  dmi.product.sku: LENOVO_MT_20HM_BU_Think_FM_ThinkPad X270
  dmi.product.version: ThinkPad X270
  dmi.sys.vendor: LENOVO

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