reproduce (this is a W=1 build):
        # https://github.com/zen-kernel/zen-kernel/commit/d821e3e85092581709b1b5f9ab8cacf0ce70c1a8
        git remote add zen https://github.com/zen-kernel/zen-kernel
        git fetch --no-tags zen 6.10/prjc
        git checkout d821e3e85092581709b1b5f9ab8cacf0ce70c1a8
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=x86_64 olddefconfig
        make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash kernel/sched/