Did this issue start happening after an update/upgrade? Was there a
kernel version where you were not having this particular problem? This
will help determine if the problem you are seeing is the result of a
regression, and when this regression was introduced.   If this is a
regression, we can perform a kernel bisect to identify the commit that
introduced the problem.


** Package changed: linux-lts-xenial (Ubuntu) => linux (Ubuntu)

** Changed in: linux (Ubuntu)
   Importance: Undecided => Medium

** Changed in: linux (Ubuntu)
       Status: Confirmed => New

** Tags added: kernel-da-key xenial

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https://bugs.launchpad.net/bugs/1773165

Title:
  openvswitch-datapath-dkms kernel module is not getting loaded

Status in linux package in Ubuntu:
  New

Bug description:
  Distributor ID: Ubuntu
  Description: Ubuntu 16.04.4 LTS
  Release: 16.04
  Codename: xenial

  Kernel version: 4.4.0-127-generic
  OVS version: 2.7.0

  
  # Issue description
  openvswitch-datapath-dkms kernelmodule is not getting loaded

  
  # Error from dmesg
  [10863.380564] openvswitch: module verification failed: signature and/or 
required key missing - tainting kernel
  [10863.381804] openvswitch: exports duplicate symbol dst_cache_destroy (owned 
by kernel)
  [10863.517173] openvswitch: exports duplicate symbol dst_cache_destroy (owned 
by kernel)
  [10878.094250] openvswitch: exports duplicate symbol dst_cache_destroy (owned 
by kernel)

  
  #Error from syslog
  May 24 08:37:06 dev65 kernel: [76508.361496] openvswitch: exports duplicate 
symbol dst_cache_destroy (owned by kernel)
  May 24 08:37:06 dev65 openvswitch-switch[18336]: modprobe: ERROR: could not 
insert 'openvswitch': Exec format error
  May 24 08:37:06 dev65 openvswitch-switch[18336]:  * Inserting openvswitch 
module

  
  #installation logs:
  Selecting previously unselected package openvswitch-datapath-dkms.
  (Reading database ... 84707 files and directories currently installed.)
  Preparing to unpack openvswitch-datapath-dkms_2.7.0-1_all.deb ...
  Unpacking openvswitch-datapath-dkms (2.7.0-1) ...
  Setting up openvswitch-datapath-dkms (2.7.0-1) ...

  Creating symlink /var/lib/dkms/openvswitch/2.7.0/source ->
                   /usr/src/openvswitch-2.7.0

  DKMS: add completed.

  Kernel preparation unnecessary for this kernel.  Skipping...

  Building module:
  cleaning build area....(bad exit status: 2)
  ./configure --with-linux='/lib/modules/4.4.0-127-generic/build' && make -C 
datapath/linux......................
  cleaning build area....(bad exit status: 2)

  DKMS: build completed.

  openvswitch:
  Running module version sanity check.
   - Original module
   - Installation
     - Installing to /lib/modules/4.4.0-127-generic/updates/dkms/

  vport-geneve.ko:
  Running module version sanity check.
   - Original module
   - Installation
     - Installing to /lib/modules/4.4.0-127-generic/updates/dkms/

  vport-gre.ko:
  Running module version sanity check.
   - Original module
   - Installation
     - Installing to /lib/modules/4.4.0-127-generic/updates/dkms/

  vport-lisp.ko:
  Running module version sanity check.
   - Original module
   - Installation
     - Installing to /lib/modules/4.4.0-127-generic/updates/dkms/

  vport-stt.ko:
  Running module version sanity check.
   - Original module
   - Installation
     - Installing to /lib/modules/4.4.0-127-generic/updates/dkms/

  vport-vxlan.ko:
  Running module version sanity check.
   - Original module
   - Installation
     - Installing to /lib/modules/4.4.0-127-generic/updates/dkms/

  depmod....

  DKMS: install completed.

  
  #Dpkg status
  dpkg -l | grep openvswitch
  ii  openvswitch-common                   2.7.0-1                              
      amd64        Open vSwitch common components
  ii  openvswitch-datapath-dkms            2.7.0-1                              
      all          Open vSwitch datapath module source - DKMS version
  ii  openvswitch-switch                   2.7.0-1                              
      amd64        Open vSwitch switch implementations
  ii  python-openvswitch                   2.6.1-0ubuntu5.2~cloud0              
      all          Python bindings for Open vSwitch

  #lsmod status
  No modules are listing for openvswitch-datapath-dkms

  #modprobe error
  modprobe openvswitch
  modprobe: ERROR: could not insert 'openvswitch': Exec format error

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