reproduce (this is a W=1 build):
        # https://github.com/ceph/ceph-client/commit/cb4ac0e6565fe667dba2760b6a012306e6f796e0
        git remote add ceph-client https://github.com/ceph/ceph-client.git
        git fetch --no-tags ceph-client testing
        git checkout cb4ac0e6565fe667dba2760b6a012306e6f796e0

        # install um cross compiling tool for clang build
        # apt-get install binutils-um-linux-gnu
        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=$HOME/0day COMPILER=clang-17 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=um olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-17 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=um SHELL=/bin/bash drivers/iommu/riscv/ drivers/media/i2c/ fs/ceph/ fs/udf/ io_uring/