Bug#1071568: nvidia-kernel-dkms: module (from backports) fails to build with 5.10.216-1 (ABI 29 kernel) in Debian bullseye

[Salvatore Bonaccorso]

Package: nvidia-kernel-dkms
Version: 525.147.05-7~deb12u1~bpo11+2
Severity: serious
Justification: FTBFS
X-Debbugs-Cc: carnil at debian.org

Hi Andreas,

This is only for the bullseye-backports version of
525.147.05-7~deb12u1~bpo11+2 when building for 5.10.216-1 (ABI 29
kernel).

The build fails with:

make -f /usr/src/linux-headers-5.10.0-29-common/scripts/Makefile.modpost
  sed 's/ko$/o/' /var/lib/dkms/nvidia-current/525.147.05/build/modules.order | scripts/mod/modpost -m    -o /var/lib/d
kms/nvidia-current/525.147.05/build/Module.symvers -e -i Module.symvers   -T -
FATAL: modpost: GPL-incompatible module nvidia.ko uses GPL-only symbol 'rcu_read_unlock_strict'
make[3]: *** [/usr/src/linux-headers-5.10.0-29-common/scripts/Makefile.modpost:123: /var/lib/dkms/nvidia-current/525.147.05/build/Module.symvers] Error 1
make[2]: *** [/usr/src/linux-headers-5.10.0-29-common/Makefile:1783: modules] Error 2
make[2]: Leaving directory '/usr/src/linux-headers-5.10.0-29-amd64'
make[1]: *** [Makefile:192: __sub-make] Error 2
make[1]: Leaving directory '/usr/src/linux-headers-5.10.0-29-common'
make: *** [Makefile:82: modules] Error 2

Regards,
Salvatore
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