This bug was fixed in the package v4l2loopback - 0.12.7-2ubuntu2~22.04.1
---------------
v4l2loopback (0.12.7-2ubuntu2~22.04.1) jammy; urgency=medium
* Backport dkms support for HWE kernels. LP: #1999670
v4l2loopback (0.12.7-2ubuntu2) kinetic; urgency=medium
* Preserve CC setting when invoking sub-make, to ensure module can be
built correctly with the kernel's custom compiler. Fixes FTBFS in
hwe-5.19 build. LP: #1991664
v4l2loopback (0.12.7-2ubuntu1) kinetic; urgency=medium
* Merge from Debian, remaining changes:
- drop module-assistant autopkgtest
- add Ubuntu patch track active-readers
- add Ubuntu patch implement support for V4L2_EVENT_PRI_CLIENT_USAGE
v4l2loopback (0.12.7-2) unstable; urgency=medium
* Fix DKMS build on linux>=5.18
v4l2loopback (0.12.7-1) unstable; urgency=medium
* New upstream version 0.12.7
[ Andreas Beckmann ]
* Switch to dh-sequence-dkms.
* Switch to Testsuite: autopkgtest-pkg-dkms.
[ Debian Janitor ]
* Set upstream metadata fields: Bug-Database, Bug-Submit, Repository,
Repository-Browse.
* Remove constraints unnecessary since buster
[ IOhannes m zmölnig ]
* Drop patches applied upstream
* Drop unnecessary B-Ds
* Bump dh-compat to 13
* Bump standards version to 4.6.1
v4l2loopback (0.12.5-1ubuntu7) kinetic; urgency=medium
* Drop obsolte REMAKE_INITRD option from dkms.conf.
* Update module init & exit calls to use kernel provided macros, such
that they gain correct IBT attributes. LP: #1980484
v4l2loopback (0.12.5-1ubuntu6) kinetic; urgency=low
* Check CONFIG_VIDEO_DEV against kernel version >= 5.18. (LP:
#1970983)
-- Dimitri John Ledkov <[email protected]> Mon, 16 Jan 2023
11:22:08 +0000
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https://bugs.launchpad.net/bugs/1991664
Title:
backport dkms fixes to build modules correctly for hwe-5.19+ kernels
with custom compiler
Status in backport-iwlwifi-dkms package in Ubuntu:
Fix Released
Status in dkms package in Ubuntu:
Fix Released
Status in ipu6-drivers package in Ubuntu:
New
Status in ivsc-driver package in Ubuntu:
New
Status in linux package in Ubuntu:
Fix Released
Status in v4l2loopback package in Ubuntu:
Fix Released
Status in zfs-linux package in Ubuntu:
Fix Released
Status in backport-iwlwifi-dkms source package in Jammy:
New
Status in dkms source package in Jammy:
Fix Released
Status in ipu6-drivers source package in Jammy:
New
Status in ivsc-driver source package in Jammy:
New
Status in linux source package in Jammy:
Incomplete
Status in v4l2loopback source package in Jammy:
Fix Released
Status in zfs-linux source package in Jammy:
Fix Released
Bug description:
tl; dr
this has proven to be a bit futile, and instead we went ahead with
changing the default kernel makefiles to default to the correct
toolchain and we have reverted hwe-5.19 kernel to use stock gcc on
jammy for now.
So the things described here are not strictly even needed in jammy for
now.
[ Impact ]
* hwe-5.19 kernel has to be compiled with gcc-12+ for the new
security kernel config options that have been enabled in that kernel
(init zero structs).
* dkms needs to be patched to attempt to use the same compiler as was
used to build the kernel, specifically use gcc for v5.15 but gcc-12
for v5.19+ in jammy
* dkms autopkgtests also need to be improved to ensure there are no
false negatives when kernel has module under test already built-in at
the same version.
* because linux-headers packages in Ubuntu do not depend on a
toolchain, and it is very hard to correctly depend on a native or
cross-toolchain, add gcc-12 dependency in the dkms package.
[ Test Plan ]
* Retrigger dkms module test for a built-in package of the same
version as already built into the kernel, for example zfs-linux dkms.
It should pass.
* Attempt to build dkms modules against v5.15 kernel and v5.19 kernel
from proposed. dkms module should be built with gcc and gcc-12
respectively.
[ Where problems could occur ]
* New gcc-12 dependency on the dkms package may result in two
compilers being installed in the Ubuntu Desktop Live image
* New gcc-12 dependency may prevent automatic upgrade/installation of
the dkms package update via unattended upgrades.
[ Other Info ]
* It is questionable for dkms to depend on any c-compiler, given that
a module for a given kernel can really be built with the same
toolchain and the same compiler features.
* In debian, linux kernel packages ship and extra configuration file
in the kernel headers, dkms uses said configuration file to use a
matching compiler, and linux-headers packages depend on the toolchain
used to build a given kernel. Maybe in the future Ubuntu could
consider using the same packaging.
* Some DKMS modules need further fixes to preserve and not loose the
compiler setting
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