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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

** Affects: linux (Ubuntu)
     Importance: Medium
         Status: New


** Tags: openvswitch
-- 
openvswitch-datapath-dkms kernel module is not getting loaded
https://bugs.launchpad.net/bugs/1773165
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