reproduce (this is a W=1 build):
        git remote add paulmck-rcu https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git
        git fetch paulmck-rcu dev
        git checkout paulmck-rcu/dev
        b4 shazam https://lore.kernel.org/r/20240328075318.83039-10-jiangshanlai@gmail.com
        # 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 arch/x86/