reproduce (this is a W=1 build):
        # https://github.com/intel/linux-intel-lts/commit/814c5b1590037330381a4ae83aaf40c0986ba2bb
        git remote add intel-lts https://github.com/intel/linux-intel-lts.git
        git fetch --no-tags intel-lts 6.18/linux
        git checkout 814c5b1590037330381a4ae83aaf40c0986ba2bb
        # apt-get install llvm-dev

        # save the config file
        make W=1 ARCH=i386 olddefconfig
        make W=1 ARCH=i386 
        make W=1 headers_install
        make W=1 -C tools/testing/selftests