reproduce (this is a W=1 build):
        git clone https://github.com/intel/lkp-tests.git ~/lkp-tests
        # https://github.com/bvanassche/linux/commit/ce14c650535d31959070629f347cb214f6e51d3d
        git remote add bvanassche https://github.com/bvanassche/linux
        git fetch --no-tags bvanassche thread-safety
        git checkout ce14c650535d31959070629f347cb214f6e51d3d
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-21 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=hexagon olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-21 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=hexagon SHELL=/bin/bash drivers/fpga/tests/