tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: fb57b1fabcb28f358901b2df90abd2b48abc1ca8 commit: 5bef8da66a9c45d3c371d74463894f1fc31dfdda [4055/10701] rcu: Add per-task state to RCU CPU stall warnings config: nios2-randconfig-r021-20200519 (attached as .config) compiler: nios2-linux-gcc (GCC) 9.3.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git checkout 5bef8da66a9c45d3c371d74463894f1fc31dfdda # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=nios2 If you fix the issue, kindly add following tag as appropriate Reported-by: kbuild test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>, old ones prefixed by <<): In file included from kernel/rcu/tree.c:4075: kernel/rcu/tree_stall.h: In function 'check_slow_task': 208 | struct rcu_node *rnp; | ^~~ vim +/rnp +208 kernel/rcu/tree_stall.h 201 202 /* 203 * Report out the state of a not-running task that is stalling the 204 * current RCU grace period. 205 */ 206 static bool check_slow_task(struct task_struct *t, void *arg) 207 { 209 struct rcu_stall_chk_rdr *rscrp = arg; 210 211 if (task_curr(t)) 212 return false; // It is running, so decline to inspect it. 213 rscrp->nesting = t->rcu_read_lock_nesting; 214 rscrp->rs = t->rcu_read_unlock_special; 215 rnp = t->rcu_blocked_node; 216 rscrp->on_blkd_list = !list_empty(&t->rcu_node_entry); 217 return true; 218 } 219 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org