reproduce (this is a W=1 build):
        git clone https://github.com/intel/lkp-tests.git ~/lkp-tests
        # https://github.com/isilence/linux/commit/7d14efdc8782b0359d840b3434d06415162da138
        git remote add isilence https://github.com/isilence/linux
        git fetch --no-tags isilence zcrx/v5
        git checkout 7d14efdc8782b0359d840b3434d06415162da138
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-18 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=i386 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-18 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=i386 SHELL=/bin/bash net/ipv4/