reproduce (this is a W=1 build):
        git clone https://github.com/intel/lkp-tests.git ~/lkp-tests
        # https://github.com/btrfs/linux/commit/49c863d9d6690e1ba2ffa093994e03a0cefd50ad
        git remote add btrfs https://github.com/btrfs/linux.git
        git fetch --no-tags btrfs pr/1157
        git checkout 49c863d9d6690e1ba2ffa093994e03a0cefd50ad
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-14.2.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=powerpc olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-14.2.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=powerpc SHELL=/bin/bash