reproduce (this is a W=1 build):
        git clone https://github.com/intel/lkp-tests.git ~/lkp-tests
        # https://github.com/goldwynr/linux/commit/18dabc17c9eeef85c6c8addf9fec377cfa3d685c
        git remote add goldwynr https://github.com/goldwynr/linux
        git fetch --no-tags goldwynr iomap.1
        git checkout 18dabc17c9eeef85c6c8addf9fec377cfa3d685c
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-13.2.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=arm64 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-13.2.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=arm64 SHELL=/bin/bash fs/btrfs/