tree: https://chromium.googlesource.com/chromiumos/third_party/kernel chromeos-5.10 head: 73dbeef4571d1037d5e03374fad31195f60956cf commit: 264a61835373f3600e2eed6966ca6240a98af38f [114/1031] CHROMIUM: sysrq: Added Chrome OS specific 'x' key config: i386-randconfig-s001-20201217 (attached as .config) compiler: gcc-9 (Debian 9.3.0-15) 9.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.3-184-g1b896707-dirty git remote add chrome-os https://chromium.googlesource.com/chromiumos/third_party/kernel git fetch --no-tags chrome-os chromeos-5.10 git checkout 264a61835373f3600e2eed6966ca6240a98af38f # save the attached .config to linux build tree make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=i386 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; "sparse warnings: (new ones prefixed by >>)" drivers/tty/sysrq.c:456:40: sparse: expected char const *cs drivers/tty/sysrq.c:456:40: sparse: got char [noderef] __rcu * drivers/tty/sysrq.c: note: in included file (through include/linux/rculist.h, include/linux/sched/signal.h): include/linux/rcupdate.h:693:9: sparse: sparse: context imbalance in 'sysrq_handle_crash' - unexpected unlock vim +456 drivers/tty/sysrq.c 441 442 /* send a signal to a process named comm if it has a certain parent */ 443 /* if parent is NULL, send to the first matching process */ 444 static void sysrq_x_cros_signal_process(char *comm, char *parent, int sig) 445 { 446 struct task_struct *p; 447 448 read_lock(&tasklist_lock); 449 for_each_process(p) { 450 if (p->flags & (PF_KTHREAD | PF_EXITING)) 451 continue; 452 if (is_global_init(p)) 453 continue; 454 if (strncmp(p->comm, comm, TASK_COMM_LEN)) 455 continue; 457 continue; 458 459 printk(KERN_INFO "%s: signal %d %s pid %u tgid %u\n", 460 __func__, sig, comm, p->pid, p->tgid); 461 do_send_sig_info(sig, SEND_SIG_PRIV, p, true); 462 } 463 read_unlock(&tasklist_lock); 464 } 465 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org