reproduce (this is a W=1 build):
        git checkout v6.15-rc3
        b4 shazam https://lore.kernel.org/r/20250420154647.1233033-6-sandeen@redhat.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 fs/f2fs/