reproduce (this is a W=1 build):
        # https://github.com/jimc/linux/commit/1004de649431d4488b747496cffa70b779e91550
        git remote add jimc https://github.com/jimc/linux.git
        git fetch --no-tags jimc dyndbg-bonsai-clean
        git checkout 1004de649431d4488b747496cffa70b779e91550

        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=$HOME/0day COMPILER=gcc-8.5.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=alpha olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-8.5.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=alpha SHELL=/bin/bash init/