reproduce (this is a W=1 build):
        # https://github.com/intel-lab-lkp/linux/commit/f18fcea709e431e32f29d553290a21173d8530f6
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Tejun-Heo/cgroup-Defer-css-percpu_ref-kill-on-rmdir-until-cgroup-is-depopulated/20260503-165802
        git checkout f18fcea709e431e32f29d553290a21173d8530f6

        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