reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/rcu/linux.git/commit/?id=65c7582d8315f7f0451eac635d803b2def726d44
        git remote add rcu https://git.kernel.org/pub/scm/linux/kernel/git/rcu/linux.git
        git fetch --no-tags rcu torture.2025.02.04a
        git checkout 65c7582d8315f7f0451eac635d803b2def726d44
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=i386 olddefconfig
        make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash kernel/rcu/