reproduce (this is a W=1 build):
        git remote add tytso-ext4 https://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git
        git fetch tytso-ext4 dev
        git checkout tytso-ext4/dev
        b4 shazam https://lore.kernel.org/r/3a17d8d55c88799a3af9a7d337f183863912e28e.1726034272.git.ojaswin@linux.ibm.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