reproduce (this is a W=1 build):
        git clone https://github.com/intel/lkp-tests.git ~/lkp-tests
        # https://git.kernel.org/pub/scm/linux/kernel/git/namhyung/linux-perf.git/commit/?id=5526cfecf481020db6a97c20b44511f4a0cd7a7e
        git remote add namhyung-perf https://git.kernel.org/pub/scm/linux/kernel/git/namhyung/linux-perf.git
        git fetch --no-tags namhyung-perf bpf/slab-iter-v5
        git checkout 5526cfecf481020db6a97c20b44511f4a0cd7a7e
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=arm64 olddefconfig
        ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=arm64 SHELL=/bin/bash mm/ net/sched/