dahdi-dkms FTBS in Noble with the linux-6.17 kernel

[John Cabaj]

[ Impact ]

DKMS (dkms-3.2.0) make.log for dahdi/3.1.0+git20230717 for kernel 6.17.0-7-generic (x86_64)
Thu Dec 18 16:49:27 UTC 2025

Building module(s)
# command: (make modules KVERS=6.17.0-7-generic MODULES_EXTRA='dahdi_dummy dahdi_echocan_oslec'; make KVERS=6.17.0-7-generic)
make -C /lib/modules/6.17.0-7-generic/build KBUILD_EXTMOD=/var/lib/dkms/dahdi/3.1.0+git20230717/build/drivers/dahdi DAHDI_INCLUDE=/var/lib/dkms/dahdi/3.1.0+git20230717/build/include DAHDI_MODULES_EXTRA="dahdi_dummy.o dahdi_echocan_oslec.o " HOTPLUG_FIRMWARE=yes modules DAHDI_BUILD_ALL=m
make[1]: Entering directory '/usr/src/linux-headers-6.17.0-7-generic'
make[2]: Entering directory '/var/lib/dkms/dahdi/3.1.0+git20230717/build/drivers/dahdi'
warning: the compiler differs from the one used to build the kernel
  The kernel was built by: x86_64-linux-gnu-gcc (Ubuntu 15.2.0-4ubuntu4) 15.2.0
  You are using: gcc (Ubuntu 15.2.0-4ubuntu4) 15.2.0
  CC [M] dahdi-base.o
dahdi-base.c: In function ‘coretimer_cleanup’:
dahdi-base.c:10142:9: error: implicit declaration of function ‘del_timer_sync’; did you mean ‘dev_mc_sync’? [-Wimplicit-function-declaration]
10142 | del_timer_sync(&core_timer.timer);
      | ^~~~~~~~~~~~~~
      | dev_mc_sync
make[4]: *** [/usr/src/linux-headers-6.17.0-7-generic/scripts/Makefile.build:287: dahdi-base.o] Error 1
make[3]: *** [/usr/src/linux-headers-6.17.0-7-generic/Makefile:2016: .] Error 2
make[2]: *** [/usr/src/linux-headers-6.17.0-7-generic/Makefile:248: __sub-make] Error 2
make[2]: Leaving directory '/var/lib/dkms/dahdi/3.1.0+git20230717/build/drivers/dahdi'
make[1]: *** [Makefile:248: __sub-make] Error 2
make[1]: Leaving directory '/usr/src/linux-headers-6.17.0-7-generic'
make: *** [Makefile:74: modules] Error 2
make -C /lib/modules/6.17.0-7-generic/build KBUILD_EXTMOD=/var/lib/dkms/dahdi/3.1.0+git20230717/build/drivers/dahdi DAHDI_INCLUDE=/var/lib/dkms/dahdi/3.1.0+git20230717/build/include DAHDI_MODULES_EXTRA=" " HOTPLUG_FIRMWARE=yes modules DAHDI_BUILD_ALL=m
make[1]: Entering directory '/usr/src/linux-headers-6.17.0-7-generic'
make[2]: Entering directory '/var/lib/dkms/dahdi/3.1.0+git20230717/build/drivers/dahdi'
warning: the compiler differs from the one used to build the kernel
  The kernel was built by: x86_64-linux-gnu-gcc (Ubuntu 15.2.0-4ubuntu4) 15.2.0
  You are using: gcc (Ubuntu 15.2.0-4ubuntu4) 15.2.0
  CC [M] dahdi-base.o
dahdi-base.c: In function ‘coretimer_cleanup’:
dahdi-base.c:10142:9: error: implicit declaration of function ‘del_timer_sync’; did you mean ‘dev_mc_sync’? [-Wimplicit-function-declaration]
10142 | del_timer_sync(&core_timer.timer);
      | ^~~~~~~~~~~~~~
      | dev_mc_sync
make[4]: *** [/usr/src/linux-headers-6.17.0-7-generic/scripts/Makefile.build:287: dahdi-base.o] Error 1
make[3]: *** [/usr/src/linux-headers-6.17.0-7-generic/Makefile:2016: .] Error 2
make[2]: *** [/usr/src/linux-headers-6.17.0-7-generic/Makefile:248: __sub-make] Error 2
make[2]: Leaving directory '/var/lib/dkms/dahdi/3.1.0+git20230717/build/drivers/dahdi'
make[1]: *** [Makefile:248: __sub-make] Error 2
make[1]: Leaving directory '/usr/src/linux-headers-6.17.0-7-generic'
make: *** [Makefile:74: modules] Error 2

# exit code: 2
# elapsed time: 00:00:03
----------------------------------------------------------------

[ Test case ]

Install the latest linux-6.17 kernel on Noble:

$ sudo add-apt-repository ppa:canonical-kernel-team/ppa3
$ sudo apt install linux-generic-hwe-24.04-edge

Install dahdi-dkms:

$ sudo apt install dahdi-dkms

Module built and installed successfully

Load the module:

$ sudo modprobe dahdi

Module loaded successfully

The same procedure must be repeated on linux-6.8 and linux-6.14 to test for possible regressions.

In Questing and Resolute install the latest kernel and repeat the procedure above.

[ Fix ]

Patches to enable 6.15 kernel:

Adding:
-debian/patches/1190-Fix-timer-changes-in-Linux-6.15-6.16.patch
-debian/patches/1200-Kbuild-Use-ccflags-y-instead-of-EXTRA_CFLAGS.patch

Removing:
-debian/patches/1190-rename-to-timer_delete_sync-in-Linux-6.15.patch

Adding Ubuntu Developers as Maintainer

[ Regression potential ]

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

[John Cabaj (john-cabaj)]

1:3.1.0+git20230717~dfsg-10.1 -> 1:3.1.0+git20230717~dfsg-10.1ubuntu1 debdiff

[John Cabaj (john-cabaj)]

1:3.1.0+git20230717~dfsg-10.1 -> 1:3.1.0+git20230717~dfsg-10.1ubuntu0.1 debdiff

[John Cabaj (john-cabaj)]

1:2.11.1.0.20170917~dfsg-8.4ubuntu5.1 -> 1:2.11.1.0.20170917~dfsg-8.4ubuntu5.2 debdiff

[John Cabaj (john-cabaj)]

All packages built here - https://launchpad.net/~john-cabaj/+archive/ubuntu/hwe-6.17-dkms

[Massimiliano Pellizzer (mpellizzer)]

Resolute uploaded thanks

[Massimiliano Pellizzer (mpellizzer)]

For Questing I backported Resolute's package

[Massimiliano Pellizzer (mpellizzer)]

Noble uploaded, thanks

[Launchpad Janitor (janitor)]

This bug was fixed in the package dahdi-linux - 1:3.1.0+git20230717~dfsg-10.1ubuntu1

---------------
dahdi-linux (1:3.1.0+git20230717~dfsg-10.1ubuntu1) resolute; urgency=medium

  * Support 6.17 kernel (LP: #2136821)
    - debian/patches:
        - Adding:
            - 1190-rename-to-timer_delete_sync-in-Linux-6.15.patch
            - 1200-Kbuild-Use-ccflags-y-instead-of-EXTRA_CFLAGS.patch
        - Removing:
            - 1190-timer_setup.patch
    - Adding Ubuntu Developers as Maintainer

 -- John Cabaj <email address hidden> Thu, 18 Dec 2025 10:33:10 -0600

[Timo Aaltonen (tjaalton)]

Hello John, or anyone else affected,

Accepted dahdi-linux into questing-proposed. The package will build now and be available at https://launchpad.net/ubuntu/+source/dahdi-linux/1:3.1.0+git20230717~dfsg-10.1ubuntu1~25.10.1 in a few hours, and then in the -proposed repository.

Please help us by testing this new package. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how to enable and use -proposed. Your feedback will aid us getting this update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug, mentioning the version of the package you tested, what testing has been performed on the package and change the tag from verification-needed-questing to verification-done-questing. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification-failed-questing. In either case, without details of your testing we will not be able to proceed.

Further information regarding the verification process can be found at https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in advance for helping!

N.B. The updated package will be released to -updates after the bug(s) fixed by this package have been verified and the package has been in -proposed for a minimum of 7 days.

[Timo Aaltonen (tjaalton)]

Hello John, or anyone else affected,

Accepted dahdi-linux into noble-proposed. The package will build now and be available at https://launchpad.net/ubuntu/+source/dahdi-linux/1:2.11.1.0.20170917~dfsg-8.4ubuntu5.2 in a few hours, and then in the -proposed repository.

Please help us by testing this new package. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how to enable and use -proposed. Your feedback will aid us getting this update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug, mentioning the version of the package you tested, what testing has been performed on the package and change the tag from verification-needed-noble to verification-done-noble. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification-failed-noble. In either case, without details of your testing we will not be able to proceed.

Further information regarding the verification process can be found at https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in advance for helping!

N.B. The updated package will be released to -updates after the bug(s) fixed by this package have been verified and the package has been in -proposed for a minimum of 7 days.

[John Cabaj (john-cabaj)]

Modules built and installed successfully. Modules loaded successfully on 6.8 and 6.17 kernels:

Noble 6.8 kernel:

root@noble-lts-vm:~# uname -r
6.8.0-90-generic
root@noble-lts-vm:~# modprobe dahdi
root@noble-lts-vm:~#

Noble 6.17 kernel:

root@noble-hwe-vm:~# uname -r
6.17.0-7-generic
root@noble-hwe-vm:~# modprobe dahdi
root@noble-hwe-vm:~#

Questing 6.17 kernel:

root@questing-vm:~# uname -r
6.17.0-8-generic
root@questing-vm:~# modprobe dahdi
root@questing-vm:~#