reproduce (this is a W=1 build):
        git remote add tip https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git
        git fetch tip timers/core
        git checkout tip/timers/core
        b4 shazam https://lore.kernel.org/r/20251218090625.557965-1-lihaoxiang@isrc.iscas.ac.cn

        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=x86_64 olddefconfig
        make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash