reproduce (this is a W=1 build):
        git clone https://github.com/intel/lkp-tests.git ~/lkp-tests
        # https://github.com/zen-kernel/zen-kernel/commit/bd615ed3d93b46de51886f6c345c47a4e925ea7b
        git remote add zen https://github.com/zen-kernel/zen-kernel
        git fetch --no-tags zen 6.13/invlpgb-v7
        git checkout bd615ed3d93b46de51886f6c345c47a4e925ea7b
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-19 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=i386 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-19 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=i386 prepare