Re: [linux-next:master 5835/8914] ld.lld: error: undefined symbol: __cgroup_bpf_run_lsm_current

[Stanislav Fomichev <sdf@google.com>]

On Sat, Jul 9, 2022 at 1:07 PM kernel test robot <lkp@intel.com> wrote:
>
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
> head:   f2528c29385819a84480cacef4886b049761e2c5
> commit: 69fd337a975c7e690dfe49d9cb4fe5ba1e6db44e [5835/8914] bpf: per-cgroup lsm flavor
> config: arm64-randconfig-r013-20220708 (https://download.01.org/0day-ci/archive/20220710/202207100408.3Fsr7rOp-lkp@intel.com/config)
> compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 77a38f6839980bfac61babb40d83772c51427011)
> reproduce (this is a W=1 build):
>         wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>         chmod +x ~/bin/make.cross
>         # install arm64 cross compiling tool for clang build
>         # apt-get install binutils-aarch64-linux-gnu
>         # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=69fd337a975c7e690dfe49d9cb4fe5ba1e6db44e
>         git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
>         git fetch --no-tags linux-next master
>         git checkout 69fd337a975c7e690dfe49d9cb4fe5ba1e6db44e
>         # save the config file
>         mkdir build_dir && cp config build_dir/.config
>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm64 SHELL=/bin/bash
>
> If you fix the issue, kindly add following tag where applicable
> Reported-by: kernel test robot <lkp@intel.com>
>
> All errors (new ones prefixed by >>):
>
> >> ld.lld: error: undefined symbol: __cgroup_bpf_run_lsm_current
>    >>> referenced by bpf_lsm.c:0 (kernel/bpf/bpf_lsm.c:0)
>    >>> bpf/bpf_lsm.o:(bpf_lsm_find_cgroup_shim) in archive kernel/built-in.a
>    >>> referenced by bpf_lsm.c:0 (kernel/bpf/bpf_lsm.c:0)
>    >>> bpf/bpf_lsm.o:(bpf_lsm_find_cgroup_shim) in archive kernel/built-in.a
>    >>> referenced by bpf_lsm.c:0 (kernel/bpf/bpf_lsm.c:0)
>    >>> bpf/bpf_lsm.o:(bpf_lsm_find_cgroup_shim) in archive kernel/built-in.a
>    >>> referenced 1 more times
> --
> >> ld.lld: error: undefined symbol: __cgroup_bpf_run_lsm_socket
>    >>> referenced by bpf_lsm.c:0 (kernel/bpf/bpf_lsm.c:0)
>    >>> bpf/bpf_lsm.o:(bpf_lsm_find_cgroup_shim) in archive kernel/built-in.a
>    >>> referenced by bpf_lsm.c:0 (kernel/bpf/bpf_lsm.c:0)
>    >>> bpf/bpf_lsm.o:(bpf_lsm_find_cgroup_shim) in archive kernel/built-in.a
> --
> >> ld.lld: error: undefined symbol: __cgroup_bpf_run_lsm_sock
>    >>> referenced by bpf_lsm.c:65 (kernel/bpf/bpf_lsm.c:65)
>    >>> bpf/bpf_lsm.o:(bpf_lsm_find_cgroup_shim) in archive kernel/built-in.a
>    >>> referenced by bpf_lsm.c:65 (kernel/bpf/bpf_lsm.c:65)
>    >>> bpf/bpf_lsm.o:(bpf_lsm_find_cgroup_shim) in archive kernel/built-in.a
>
> --
> 0-DAY CI Kernel Test Service
> https://01.org/lkp

More esoteric configurations:

CONFIG_BPF_LSM=y
# CONFIG_CGROUP_BPF is not set

Will fix it sometime this week along with the other warning about unused 'args'.