reproduce (this is a W=1 build):
        # https://github.com/intel-lab-lkp/linux/commit/ffaa25dad7353701805e9dae4e5d985b7ecebcc3
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Kuniyuki-Iwashima/selftest-bpf-Use-BPF_SOCK_OPS_ALL_CB_FLAGS-1-for-bad_cb_test_rv/20260510-125645
        git checkout ffaa25dad7353701805e9dae4e5d985b7ecebcc3

        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=$HOME/0day COMPILER=clang-20 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=x86_64 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-20 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash drivers/net/mdio/ net/ipv4/