[Bug 2133887] Re: jool-dkms FTBS in Noble with the linux-6.17-hwe kernel

[Massimiliano Pellizzer]

** Also affects: jool (Ubuntu Resolute)
   Importance: Undecided
       Status: New

** Also affects: jool (Ubuntu Questing)
   Importance: Undecided
       Status: New

** Changed in: jool (Ubuntu Questing)
       Status: New => Invalid

** Changed in: jool (Ubuntu Resolute)
       Status: New => Invalid

** Changed in: jool (Ubuntu Noble)
       Status: New => In Progress

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Title:
  jool-dkms FTBS in Noble with the linux-6.17-hwe kernel

Status in jool package in Ubuntu:
  Invalid
Status in jool source package in Noble:
  In Progress
Status in jool source package in Questing:
  Invalid
Status in jool source package in Resolute:
  Invalid

Bug description:
  [ Impact ]

  DKMS make.log for jool-dkms-4.1.11 for kernel 6.17.0-7-generic (x86_64)
  Thu Dec  4 17:10:26 UTC 2025
  make: Entering directory '/usr/src/linux-headers-6.17.0-7-generic'
  make[1]: Entering directory '/var/lib/dkms/jool-dkms/4.1.11/build/src/mod/common'
  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]  rfc7915/4to6.o
    CC [M]  rfc7915/6to4.o
    CC [M]  rfc7915/common.o
    CC [M]  rfc7915/core.o
    CC [M]  address_xlat.o
    CC [M]  dev.o
    CC [M]  kernel_hook_netfilter.o
    CC [M]  kernel_hook_iptables.o
    CC [M]  log.o
    CC [M]  address.o
    CC [M]  atomic_config.o
    CC [M]  icmp_wrapper.o
    CC [M]  init.o
    CC [M]  ipv6_hdr_iterator.o
    CC [M]  joold.o
    CC [M]  packet.o
    CC [M]  rfc6052.o
    CC [M]  rtrie.o
    CC [M]  stats.o
    CC [M]  types.o
    CC [M]  translation_state.o
    CC [M]  route_out.o
    CC [M]  skbuff.o
    CC [M]  core.o
    CC [M]  error_pool.o
    CC [M]  timer.o
    CC [M]  trace.o
    CC [M]  wkmalloc.o
    CC [M]  wrapper-config.o
  timer.c: In function ‘jtimer_teardown’:
  timer.c:66:9: error: implicit declaration of function ‘del_timer_sync’; did you mean ‘dev_mc_sync’? [-Werror=implicit-function-declaration]
     66 |         del_timer_sync(&timer);
        |         ^~~~~~~~~~~~~~
        |         dev_mc_sync
  cc1: some warnings being treated as errors
    CC [M]  wrapper-global.o
  make[3]: *** [/usr/src/linux-headers-6.17.0-7-generic/scripts/Makefile.build:287: timer.o] Error 1
  make[3]: *** Waiting for unfinished jobs....
  make[2]: *** [/usr/src/linux-headers-6.17.0-7-generic/Makefile:2016: .] Error 2
  make[1]: *** [/usr/src/linux-headers-6.17.0-7-generic/Makefile:248: __sub-make] Error 2
  make[1]: Leaving directory '/var/lib/dkms/jool-dkms/4.1.11/build/src/mod/common'
  make: *** [Makefile:248: __sub-make] Error 2
  make: Leaving directory '/usr/src/linux-headers-6.17.0-7-generic'

  [ 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 jool-dkms:

  $ sudo apt install jool-dkms

  Modules built and installed successfully.

  Load the modules:

  $ sudo modprobe jool_common
  $ sudo modprobe jool
  $ sudo modprobe jool_siit

  Modules loaded successfully.

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

  [ Fix ]

  Apply patch from enabling 6.17

  * debian/patches/rename-to-timer_delete_sync-in-Linux-6.15.patch

  * Adding Ubuntu Developers as Maintainers
  * Change build dependency pkg-config => pkgconf

  [ Regression potential ]

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

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