reproduce (this is a W=1 build):
        git clone https://github.com/intel/lkp-tests.git ~/lkp-tests
        # https://git.kernel.org/pub/scm/linux/kernel/git/tnguy/net-queue.git/commit/?id=c32f73251e5900d984f2ceb169d1e854445d3956
        git remote add tnguy-net-queue https://git.kernel.org/pub/scm/linux/kernel/git/tnguy/net-queue.git
        git fetch --no-tags tnguy-net-queue dev-queue
        git checkout c32f73251e5900d984f2ceb169d1e854445d3956
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-8.5.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=riscv olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-8.5.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=riscv SHELL=/bin/bash