reproduce (this is a W=1 build):
        git checkout 76ddfe7d66d631e5e31ef4e5dd59797fa03acbf7
        b4 shazam https://lore.kernel.org/r/20251107-create-excl-v2-1-f678165d7f3f@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/vboxsf/