reproduce (this is a W=1 build):
        # https://github.com/ambarus/linux-0day/commit/180e8150bde1627efa62910f16ff32d2e4fa85db
        git remote add ambarus https://github.com/ambarus/linux-0day
        git fetch --no-tags ambarus syzkaller-id-5ecbc557fcdb8a2864e876f690ef377db999c50f
        git checkout 180e8150bde1627efa62910f16ff32d2e4fa85db
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=i386 olddefconfig
        make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash