reproduce (this is a W=1 build):
        # https://github.com/zen-kernel/zen-kernel/commit/739ff9ba5889a90bc38308e00e3babe4cfd65bf3
        git remote add zen https://github.com/zen-kernel/zen-kernel
        git fetch --no-tags zen 6.18/bbr3
        git checkout 739ff9ba5889a90bc38308e00e3babe4cfd65bf3

        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=$HOME/0day COMPILER=gcc-14.3.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=riscv olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-14.3.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=riscv SHELL=/bin/bash