reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/song/linux.git/commit/?id=29d4e9aed0d3c9b01889fef51d01f9983796a30c
        git remote add song https://git.kernel.org/pub/scm/linux/kernel/git/song/linux.git
        git fetch --no-tags song vfs-mount-lsm
        git checkout 29d4e9aed0d3c9b01889fef51d01f9983796a30c

        git clone https://github.com/intel/lkp-tests.git ~/lkp-tests

        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-16.1.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=sh olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-16.1.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=sh SHELL=/bin/bash drivers/net/phy/ security/apparmor/