reproduce (this is a W=1 build):
        # https://github.com/ambarus/linux-0day/commit/1e702f432d551041753c46ec0d6d49484e776441
        git remote add ambarus https://github.com/ambarus/linux-0day
        git fetch --no-tags ambarus syzkaller-id-5ecbc557fcdb8a2864e876f690ef377db999c50f
        git checkout 1e702f432d551041753c46ec0d6d49484e776441
        # 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