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  NFS + sec=krb5 is broken

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Bionic:
  Fix Released

Bug description:
  I am testing the development branch of Bionic Beaver.
  With the latest update to kernel 4.15.0-13 my nfs-mounts in a university 
network are broken.

  > sudo mount -vvv -t nfs4 my_server:/my/share  /nfs -osoft,sec=krb5
  > mount.nfs4: timeout set for Mon Mar 26 16:29:56 2018
  > mount.nfs4: trying text-based options 
  > mount.nfs4: mount(2): Input/output error
  > mount.nfs4: mount system call failed

  > kernel: NFS: nfs4_discover_server_trunking unhandled error -5. Exiting with 
error EIO
  > kernel: RPC: couldn't encode RPC header, exit EIO
  > kernel: gss_marshal: gss_get_mic FAILED (851968)

  Known good version: linux-image-4.15.0-10

  I think it is the same bug like in
  The bug was introduced in the mainline kernel 4.15.4 with commit 
"[46e8d06e423c4f35eac7a8b677b713b3ec9b0684] crypto: hash - prevent using keyed 
hashes without setting key"

  This bug should be fixed before releasing ubuntu18.04 by either reverting the 
commit or using a fixed mainline kernel.
  ApportVersion: 2.20.9-0ubuntu1
  Architecture: amd64
   /dev/snd/controlC1:  gdm        1340 F.... pulseaudio
   /dev/snd/controlC0:  gdm        1340 F.... pulseaudio
  DistroRelease: Ubuntu 18.04
  InstallationDate: Installed on 2018-03-22 (6 days ago)
  InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Alpha amd64 (20180321)
   lo        no wireless extensions.
   enp0s31f6  no wireless extensions.
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 003: ID 046a:b091 Cherry GmbH 
   Bus 001 Device 002: ID 0bf8:101e Fujitsu Siemens Computers 
   Bus 001 Device 004: ID 0bda:0184 Realtek Semiconductor Corp. RTS5182 Card 
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: FUJITSU ESPRIMO D757
  Package: linux (not installed)
  ProcFB: 0 nouveaufb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-13-generic 
root=UUID=463c4c1b-7771-40dd-833f-f4d68a5fd914 ro quiet splash vt.handoff=1
  ProcVersionSignature: Ubuntu 4.15.0-13.14-generic 4.15.10
  PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No 
PulseAudio daemon running, or not running as session daemon.
   linux-restricted-modules-4.15.0-13-generic N/A
   linux-backports-modules-4.15.0-13-generic  N/A
   linux-firmware                             1.173
  Tags:  bionic
  Uname: Linux 4.15.0-13-generic x86_64
  UnreportableReason: Der Bericht gehört zu einem nicht installierten Paket.
  UpgradeStatus: No upgrade log present (probably fresh install)
  _MarkForUpload: False 10/12/2017
  dmi.bios.vendor: FUJITSU // American Megatrends Inc.
  dmi.bios.version: V5.0.0.12 R1.14.0 for D3531-A1x D3531-A1
  dmi.board.vendor: FUJITSU
  dmi.board.version: S26361-D3531-A1
  dmi.chassis.type: 3
  dmi.chassis.vendor: FUJITSU
dmi:bvnFUJITSU//AmericanMegatrendsInc.:bvrV5.0.0.12R1.14.0forD3531-A1x:bd10/12/2017:svnFUJITSU:pnESPRIMOD757:pvr:rvnFUJITSU:rnD3531-A1:rvrS26361-D3531-A1:cvnFUJITSU:ct3:cvr: ESPRIMO-FTS ESPRIMO D757
  dmi.sys.vendor: FUJITSU

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