Hi,

openvpn-dco-dkms fails to build the module(s) for Linux 6.15 in
experimental:

DKMS (dkms-3.2.0) make.log for ovpn-dco/0.0+git20241121 for kernel 6.15-rc7-amd64 (x86_64)
Sat May 24 21:53:40 UTC 2025

Building module(s)
# command: make -j14 KERNELRELEASE=6.15-rc7-amd64 VER=6.15-rc7-amd64 KERNEL_SRC=/lib/modules/6.15-rc7-amd64/build REVISION=0.0+git20241121
/var/lib/dkms/ovpn-dco/0.0+git20241121/build/gen-compat-autoconf.sh /var/lib/dkms/ovpn-dco/0.0+git20241121/build/compat-autoconf.h
make -C /lib/modules/6.15-rc7-amd64/build M=/var/lib/dkms/ovpn-dco/0.0+git20241121/build PWD=/var/lib/dkms/ovpn-dco/0.0+git20241121/build REVISION=0.0+git20241121 CONFIG_OVPN_DCO_V2=m INSTALL_MOD_DIR=updates/        modules
make[1]: Entering directory '/usr/src/linux-headers-6.15-rc7-amd64'
make[2]: Entering directory '/var/lib/dkms/ovpn-dco/0.0+git20241121/build'
  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
  CC [M]  drivers/net/ovpn-dco/peer.o
  CC [M]  drivers/net/ovpn-dco/sock.o
  CC [M]  drivers/net/ovpn-dco/stats.o
  CC [M]  drivers/net/ovpn-dco/netlink.o
  CC [M]  drivers/net/ovpn-dco/crypto_aead.o
  CC [M]  drivers/net/ovpn-dco/pktid.o
  CC [M]  drivers/net/ovpn-dco/tcp.o
  CC [M]  drivers/net/ovpn-dco/udp.o
drivers/net/ovpn-dco/peer.c: In function 'ovpn_peer_timer_delete_all':
drivers/net/ovpn-dco/peer.c:194:9: error: implicit declaration of function 'del_timer_sync'; did you mean 'dev_mc_sync'? [-Wimplicit-function-declaration]
  194 |         del_timer_sync(&peer->keepalive_xmit);
      |         ^~~~~~~~~~~~~~
      |         dev_mc_sync
drivers/net/ovpn-dco/peer.c: In function 'ovpn_peer_keepalive_set':
drivers/net/ovpn-dco/peer.c:306:17: error: implicit declaration of function 'del_timer'; did you mean 'add_timer'? [-Wimplicit-function-declaration]
  306 |                 del_timer(&peer->keepalive_xmit);
      |                 ^~~~~~~~~
      |                 add_timer
make[5]: *** [/usr/src/linux-headers-6.15-rc7-common/scripts/Makefile.build:208: drivers/net/ovpn-dco/peer.o] Error 1
make[5]: *** Waiting for unfinished jobs....
drivers/net/ovpn-dco/main.c:212:35: error: initialization of 'int (*)(struct net_device *, struct rtnl_newlink_params *, struct netlink_ext_ack *)' from incompatible pointer type 'int (*)(struct net *, struct net_device *, struct nlattr **, struct nlattr **, struct netlink_ext_ack *)' [-Wincompatible-pointer-types]
  212 |         .newlink                = ovpn_newlink,
      |                                   ^~~~~~~~~~~~
drivers/net/ovpn-dco/main.c:212:35: note: (near initialization for 'ovpn_link_ops.newlink')
make[5]: *** [/usr/src/linux-headers-6.15-rc7-common/scripts/Makefile.build:208: drivers/net/ovpn-dco/main.o] Error 1
make[4]: *** [/usr/src/linux-headers-6.15-rc7-common/scripts/Makefile.build:466: drivers/net/ovpn-dco] Error 2
make[3]: *** [/usr/src/linux-headers-6.15-rc7-common/Makefile:2027: .] Error 2
make[2]: *** [/usr/src/linux-headers-6.15-rc7-common/Makefile:260: __sub-make] Error 2
make[2]: Leaving directory '/var/lib/dkms/ovpn-dco/0.0+git20241121/build'
make[1]: *** [/usr/src/linux-headers-6.15-rc7-common/Makefile:260: __sub-make] Error 2
make[1]: Leaving directory '/usr/src/linux-headers-6.15-rc7-amd64'
make: *** [Makefile:51: all] Error 2

# exit code: 2
# elapsed time: 00:00:05
----------------------------------------------------------------

del_timer_sync() has been renamed to timer_delete_sync() in v6.2-rc1
"timers: Rename del_timer_sync() to timer_delete_sync()"
https://github.com/torvalds/linux/commit/9b13df3fb64ee95e2397585404e442afee2c7d4f

the backwards compatibility support wrappers have been removed in
v6.15-rc1 "treewide: Switch/rename to timer_delete[_sync]()"
https://github.com/torvalds/linux/commit/8fa7292fee5c5240402371ea89ab285ec856c916


Andreas

FWIW, the OpenVPN DCO module has just been upstreamed with 6.16. Depending
on which kernel will land in Debian/sid, the openvpn-dco-dkms package may
no longer be necessary.

Hi,

Am 24.06.25 um 14:21 schrieb Christian Kujau:

Not quite correct, those are different modules. This bug is about the
module ovpn-dco, which has been there for a while and is supported with
OpenVPN 2.6. We will release Trixie with OpenVPN 2.6, and since it does
not conflict with anything and we might want to support OpenVPN 2.6 with
a backported 6.16+ kernel I plan to keep it in testing until right
before the Forky freeze (technically not necessary, but it would be
easier to provide a trixie-backport than a trixie-stable-update).

I do plan to fix this bug once Trixie is released by updating to the new
upstream btw.

The module upstreamed is the new ovpn (currently sitting in NEW as
openvpn-ovpn-dkms) will indeed be most likely superflous once testing is
upgraded to 6.16+, but having it in testing would allow providing a
trixie-backport of both OpenVPN 2.7 and the necessary ovpn module.

Bernhard

Dear Bernhard,

Could you consider doing the update now?

Thanks!

We believe that the bug you reported is fixed in the latest version of
openvpn-dco-dkms, which is due to be installed in the Debian FTP archive.

A summary of the changes between this version and the previous one is
attached.

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to 1106554@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Bernhard Schmidt <berni@debian.org> (supplier of updated openvpn-dco-dkms package)

(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmaster@ftp-master.debian.org)
Format: 1.8
Date: Thu, 21 Aug 2025 19:59:43 +0200
Source: openvpn-dco-dkms
Architecture: source
Version: 0.0+git20250801-1
Distribution: unstable
Urgency: medium
Maintainer: Bernhard Schmidt <berni@debian.org>
Changed-By: Bernhard Schmidt <berni@debian.org>
Closes: 1106554
Changes:
 openvpn-dco-dkms (0.0+git20250801-1) unstable; urgency=medium
 .
   [ Bernhard Schmidt ]
   * New upstream version 0.0+git20250801
     - fixes build error with Linux 6.15+ (Closes: #1106554)
 .
   [ Andreas Beckmann ]
   * dkms.conf: Fix CLEAN command
   * d/rules: Simplify -dkms installation
   * dkms.conf: Set BUILD_EXCLUSIVE_KERNEL_MIN="5.4.5"
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