reproduce (this is a W=1 build):
        # https://github.com/jimc/linux/commit/02dffe3046c29ba88fdcb6767e037a75ad4aaac9
        git remote add jimc https://github.com/jimc/linux.git
        git fetch --no-tags jimc dyndbg_trace_v4_5e
        git checkout 02dffe3046c29ba88fdcb6767e037a75ad4aaac9
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=x86_64 olddefconfig
        make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash lib/