reproduce (this is a W=1 build):
        git checkout d0b3b7b22dfa1f4b515fd3a295b3fd958f9e81af
        b4 shazam https://lore.kernel.org/r/20250713-nbcon-kgdboc-v1-1-51eccd9247a8@suse.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 kernel/