reproduce (this is a W=1 build):
        git remote add bpf https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git
        git fetch bpf master
        git checkout bpf/master
        b4 shazam https://lore.kernel.org/r/20241029231244.2834368-5-song@kernel.org
        # 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 fs/notify/fanotify/