reproduce (this is a W=1 build):
        git clone https://github.com/intel/lkp-tests.git ~/lkp-tests
        # https://github.com/dvyukov/linux/commit/963efc053e92eb50c830ad41445a77e8607b5d98
        git remote add dvyukov https://github.com/dvyukov/linux
        git fetch --no-tags dvyukov dvyukov-rseq-pkey
        git checkout 963efc053e92eb50c830ad41445a77e8607b5d98
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-19 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=i386 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-19 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=i386 SHELL=/bin/bash arch/x86/kernel/