Public bug reported:

[ Impact ]

DKMS make.log for ovpn-dco-0.0+git20231103 for kernel 6.14.0-15-generic (x86_64)
Tue May 20 14:52:56 UTC 2025
/var/lib/dkms/ovpn-dco/0.0+git20231103/build/gen-compat-autoconf.sh 
/var/lib/dkms/ovpn-dco/0.0+git20231103/build/compat-autoconf.h
make -C /lib/modules/6.14.0-15-generic/build 
M=/var/lib/dkms/ovpn-dco/0.0+git20231103/build 
PWD=/var/lib/dkms/ovpn-dco/0.0+git20231103/build REVISION=0.0+git20231103 
CONFIG_OVPN_DCO_V2=m INSTALL_MOD_DIR=updates/     modules
make[1]: Entering directory '/usr/src/linux-headers-6.14.0-15-generic'
make[2]: Entering directory '/var/lib/dkms/ovpn-dco/0.0+git20231103/build'
warning: the compiler differs from the one used to build the kernel
  The kernel was built by: x86_64-linux-gnu-gcc-13 (Ubuntu 
13.3.0-6ubuntu2~24.04) 13.3.0
  You are using:           gcc-13 (Ubuntu 13.3.0-6ubuntu2~24.04) 13.3.0
  CC [M]  drivers/net/ovpn-dco/main.o
  CC [M]  drivers/net/ovpn-dco/bind.o
  CC [M]  drivers/net/ovpn-dco/crypto.o
  CC [M]  drivers/net/ovpn-dco/ovpn.o
drivers/net/ovpn-dco/main.c: In function ‘ovpn_setup’:
drivers/net/ovpn-dco/main.c:130:47: error: ‘NETIF_F_LLTX’ undeclared (first use 
in this function); did you mean ‘NETIF_F_LRO’?
  130 |         netdev_features_t feat = NETIF_F_SG | NETIF_F_LLTX |
      |                                               ^~~~~~~~~~~~
      |                                               NETIF_F_LRO
drivers/net/ovpn-dco/main.c:130:47: note: each undeclared identifier is 
reported only once for each function it appears in
  CC [M]  drivers/net/ovpn-dco/peer.o
make[5]: *** 
[/usr/src/linux-headers-6.14.0-15-generic/scripts/Makefile.build:207: 
drivers/net/ovpn-dco/main.o] Error 1
make[5]: *** Waiting for unfinished jobs....
make[4]: *** 
[/usr/src/linux-headers-6.14.0-15-generic/scripts/Makefile.build:465: 
drivers/net/ovpn-dco] Error 2
make[3]: *** [/usr/src/linux-headers-6.14.0-15-generic/Makefile:1999: .] Error 2
make[2]: *** [/usr/src/linux-headers-6.14.0-15-generic/Makefile:251: 
__sub-make] Error 2
make[2]: Leaving directory '/var/lib/dkms/ovpn-dco/0.0+git20231103/build'
make[1]: *** [Makefile:251: __sub-make] Error 2
make[1]: Leaving directory '/usr/src/linux-headers-6.14.0-15-generic'
make: *** [Makefile:59: all] Error 2

[ Test case ]

Install the latest linux-6.14 kernel on Noble:

$ sudo add-apt-repository ppa:canonical-kernel-team/ppa
$ sudo apt install linux-generic-hwe-24.04-wip

Install openvpn-dco-dkms

$ sudo apt install openvpn-dco-dkms

Load the modules:

$ sudo modprobe

The same procedure can be repeated on linux-6.8 to test for possible
regressions.

[ Fix ]

[ Regression potential ]

We may experience regressions in systems that are using the openvpn-dco
drivers, especially with kernels >= 6.8 kernel.

** Affects: openvpn-dco-dkms (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: openvpn-dco-dkms (Ubuntu Noble)
     Importance: Undecided
     Assignee: John Cabaj (john-cabaj)
         Status: In Progress

** Also affects: openvpn-dco-dkms (Ubuntu Noble)
   Importance: Undecided
       Status: New

** Changed in: openvpn-dco-dkms (Ubuntu Noble)
       Status: New => In Progress

** Changed in: openvpn-dco-dkms (Ubuntu Noble)
     Assignee: (unassigned) => John Cabaj (john-cabaj)

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https://bugs.launchpad.net/bugs/2111348

Title:
  openvpn-dco-dkms FTBS in Noble with the linux-6.14-hwe kernel

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