reproduce (this is a W=1 build):
        # https://github.com/cilium/linux/commit/f54fd4a1c99a85d283ce07ebc4505d09a28b28f5
        git remote add cilium https://github.com/cilium/linux.git
        git fetch --no-tags cilium pr/netkit-iouring6
        git checkout f54fd4a1c99a85d283ce07ebc4505d09a28b28f5

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