reproduce (this is a W=1 build):
        # https://github.com/pabeni/linux-devel/commit/1414ccc3a56482387d4d1732f8eda9f7ca73647e
        git remote add pabeni-devel https://github.com/pabeni/linux-devel
        git fetch --no-tags pabeni-devel mptcp_out_opt_refactor
        git checkout 1414ccc3a56482387d4d1732f8eda9f7ca73647e

        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=$HOME/0day COMPILER=clang-22 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=i386 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-22 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=i386 SHELL=/bin/bash net/