Hi Yonghong, First bad commit (maybe != root cause): tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: f925116b24c0c42dc6d5ab5111c55fd7f74e8dc7 commit: 48671232fcb81b76be13c11b0df7089b16baea57 [9756/14039] selftests/bpf: Add tests for bpf_rcu_read_lock() compiler: gcc-11 (Debian 11.3.0-8) 11.3.0 reproduce: # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=48671232fcb81b76be13c11b0df7089b16baea57 git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git git fetch --no-tags linux-next master git checkout 48671232fcb81b76be13c11b0df7089b16baea57 make O=/tmp/kselftest headers make O=/tmp/kselftest -C tools/testing/selftests If you fix the issue, kindly add following tag where applicable | Reported-by: kernel test robot All errors (new ones prefixed by >>): >> progs/rcu_read_lock.c:256:34: error: no member named 'last_wakee' in 'struct task_struct' last_wakee = task->real_parent->last_wakee; ~~~~~~~~~~~~~~~~~ ^ 1 error generated. -- 0-DAY CI Kernel Test Service https://01.org/lkp