tree: https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git sched/wip head: edd802a64c93706df4fae4a89f8e1a204bf705ea commit: 1827ed53b4b8de9d5a215cf55d6b2c5315b14ff2 [9/13] irq_work: Provide irq_work_queue_remote() config: s390-allnoconfig (attached as .config) compiler: s390-linux-gcc (GCC) 9.3.0 reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git checkout 1827ed53b4b8de9d5a215cf55d6b2c5315b14ff2 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=s390 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): kernel//rcu/tree.c: In function 'rcu_implicit_dynticks_qs': 1292 | irq_work_queue_on(&rdp->rcu_iw, rdp->cpu); | ^~~~~~~~~~~~~~~~~ | irq_work_queue_remote cc1: some warnings being treated as errors vim +1292 kernel//rcu/tree.c 64db4cfff99c04 kernel/rcutree.c Paul E. McKenney 2008-12-18 1184 64db4cfff99c04 kernel/rcutree.c Paul E. McKenney 2008-12-18 1185 /* 64db4cfff99c04 kernel/rcutree.c Paul E. McKenney 2008-12-18 1186 * Return true if the specified CPU has passed through a quiescent 64db4cfff99c04 kernel/rcutree.c Paul E. McKenney 2008-12-18 1187 * state by virtue of being in or having passed through an dynticks 64db4cfff99c04 kernel/rcutree.c Paul E. McKenney 2008-12-18 1188 * idle state since the last call to dyntick_save_progress_counter() a82dcc76021e22 kernel/rcutree.c Paul E. McKenney 2012-08-01 1189 * for this same CPU, or by virtue of having been offline. 64db4cfff99c04 kernel/rcutree.c Paul E. McKenney 2008-12-18 1190 */ fe5ac724d81a3c kernel/rcu/tree.c Paul E. McKenney 2017-05-11 1191 static int rcu_implicit_dynticks_qs(struct rcu_data *rdp) 64db4cfff99c04 kernel/rcutree.c Paul E. McKenney 2008-12-18 1192 { 3a19b46a5c17b1 kernel/rcu/tree.c Paul E. McKenney 2016-11-30 1193 unsigned long jtsq; 0f9be8cabbc343 kernel/rcu/tree.c Paul E. McKenney 2017-01-27 1194 bool *rnhqp; 9226b10d78ffe7 kernel/rcu/tree.c Paul E. McKenney 2017-01-27 1195 bool *ruqp; 9b9500da815027 kernel/rcu/tree.c Paul E. McKenney 2017-08-17 1196 struct rcu_node *rnp = rdp->mynode; 64db4cfff99c04 kernel/rcutree.c Paul E. McKenney 2008-12-18 1197 64db4cfff99c04 kernel/rcutree.c Paul E. McKenney 2008-12-18 1198 /* 64db4cfff99c04 kernel/rcutree.c Paul E. McKenney 2008-12-18 1199 * If the CPU passed through or entered a dynticks idle phase with 64db4cfff99c04 kernel/rcutree.c Paul E. McKenney 2008-12-18 1200 * no active irq/NMI handlers, then we can safely pretend that the CPU 64db4cfff99c04 kernel/rcutree.c Paul E. McKenney 2008-12-18 1201 * already acknowledged the request to pass through a quiescent 64db4cfff99c04 kernel/rcutree.c Paul E. McKenney 2008-12-18 1202 * state. Either way, that CPU cannot possibly be in an RCU 64db4cfff99c04 kernel/rcutree.c Paul E. McKenney 2008-12-18 1203 * read-side critical section that started before the beginning 64db4cfff99c04 kernel/rcutree.c Paul E. McKenney 2008-12-18 1204 * of the current RCU grace period. 64db4cfff99c04 kernel/rcutree.c Paul E. McKenney 2008-12-18 1205 */ dc5a4f2932f185 kernel/rcu/tree.c Paul E. McKenney 2018-08-03 1206 if (rcu_dynticks_in_eqs_since(rdp, rdp->dynticks_snap)) { 88d1bead858d88 kernel/rcu/tree.c Paul E. McKenney 2018-07-04 1207 trace_rcu_fqs(rcu_state.name, rdp->gp_seq, rdp->cpu, TPS("dti")); 9b9500da815027 kernel/rcu/tree.c Paul E. McKenney 2017-08-17 1208 rcu_gpnum_ovf(rnp, rdp); 64db4cfff99c04 kernel/rcutree.c Paul E. McKenney 2008-12-18 1209 return 1; 64db4cfff99c04 kernel/rcutree.c Paul E. McKenney 2008-12-18 1210 } 64db4cfff99c04 kernel/rcutree.c Paul E. McKenney 2008-12-18 1211 f2e2df59786d7b kernel/rcu/tree.c Paul E. McKenney 2018-05-15 1212 /* If waiting too long on an offline CPU, complain. */ f2e2df59786d7b kernel/rcu/tree.c Paul E. McKenney 2018-05-15 1213 if (!(rdp->grpmask & rcu_rnp_online_cpus(rnp)) && 88d1bead858d88 kernel/rcu/tree.c Paul E. McKenney 2018-07-04 1214 time_after(jiffies, rcu_state.gp_start + HZ)) { f2e2df59786d7b kernel/rcu/tree.c Paul E. McKenney 2018-05-15 1215 bool onl; f2e2df59786d7b kernel/rcu/tree.c Paul E. McKenney 2018-05-15 1216 struct rcu_node *rnp1; f2e2df59786d7b kernel/rcu/tree.c Paul E. McKenney 2018-05-15 1217 f2e2df59786d7b kernel/rcu/tree.c Paul E. McKenney 2018-05-15 1218 WARN_ON(1); /* Offline CPUs are supposed to report QS! */ f2e2df59786d7b kernel/rcu/tree.c Paul E. McKenney 2018-05-15 1219 pr_info("%s: grp: %d-%d level: %d ->gp_seq %ld ->completedqs %ld\n", f2e2df59786d7b kernel/rcu/tree.c Paul E. McKenney 2018-05-15 1220 __func__, rnp->grplo, rnp->grphi, rnp->level, f2e2df59786d7b kernel/rcu/tree.c Paul E. McKenney 2018-05-15 1221 (long)rnp->gp_seq, (long)rnp->completedqs); f2e2df59786d7b kernel/rcu/tree.c Paul E. McKenney 2018-05-15 1222 for (rnp1 = rnp; rnp1; rnp1 = rnp1->parent) f2e2df59786d7b kernel/rcu/tree.c Paul E. McKenney 2018-05-15 1223 pr_info("%s: %d:%d ->qsmask %#lx ->qsmaskinit %#lx ->qsmaskinitnext %#lx ->rcu_gp_init_mask %#lx\n", f2e2df59786d7b kernel/rcu/tree.c Paul E. McKenney 2018-05-15 1224 __func__, rnp1->grplo, rnp1->grphi, rnp1->qsmask, rnp1->qsmaskinit, rnp1->qsmaskinitnext, rnp1->rcu_gp_init_mask); f2e2df59786d7b kernel/rcu/tree.c Paul E. McKenney 2018-05-15 1225 onl = !!(rdp->grpmask & rcu_rnp_online_cpus(rnp)); f2e2df59786d7b kernel/rcu/tree.c Paul E. McKenney 2018-05-15 1226 pr_info("%s %d: %c online: %ld(%d) offline: %ld(%d)\n", f2e2df59786d7b kernel/rcu/tree.c Paul E. McKenney 2018-05-15 1227 __func__, rdp->cpu, ".o"[onl], f2e2df59786d7b kernel/rcu/tree.c Paul E. McKenney 2018-05-15 1228 (long)rdp->rcu_onl_gp_seq, rdp->rcu_onl_gp_flags, f2e2df59786d7b kernel/rcu/tree.c Paul E. McKenney 2018-05-15 1229 (long)rdp->rcu_ofl_gp_seq, rdp->rcu_ofl_gp_flags); f2e2df59786d7b kernel/rcu/tree.c Paul E. McKenney 2018-05-15 1230 return 1; /* Break things loose after complaining. */ f2e2df59786d7b kernel/rcu/tree.c Paul E. McKenney 2018-05-15 1231 } f2e2df59786d7b kernel/rcu/tree.c Paul E. McKenney 2018-05-15 1232 65d798f0f9339a kernel/rcutree.c Paul E. McKenney 2013-04-12 1233 /* 4a81e8328d3791 kernel/rcu/tree.c Paul E. McKenney 2014-06-20 1234 * A CPU running for an extended time within the kernel can c06aed0e31008a kernel/rcu/tree.c Paul E. McKenney 2018-07-25 1235 * delay RCU grace periods: (1) At age jiffies_to_sched_qs, c06aed0e31008a kernel/rcu/tree.c Paul E. McKenney 2018-07-25 1236 * set .rcu_urgent_qs, (2) At age 2*jiffies_to_sched_qs, set 7e28c5af4ef6b5 kernel/rcu/tree.c Paul E. McKenney 2018-07-11 1237 * both .rcu_need_heavy_qs and .rcu_urgent_qs. Note that the 7e28c5af4ef6b5 kernel/rcu/tree.c Paul E. McKenney 2018-07-11 1238 * unsynchronized assignments to the per-CPU rcu_need_heavy_qs 7e28c5af4ef6b5 kernel/rcu/tree.c Paul E. McKenney 2018-07-11 1239 * variable are safe because the assignments are repeated if this 7e28c5af4ef6b5 kernel/rcu/tree.c Paul E. McKenney 2018-07-11 1240 * CPU failed to pass through a quiescent state. This code c06aed0e31008a kernel/rcu/tree.c Paul E. McKenney 2018-07-25 1241 * also checks .jiffies_resched in case jiffies_to_sched_qs 7e28c5af4ef6b5 kernel/rcu/tree.c Paul E. McKenney 2018-07-11 1242 * is set way high. 4a81e8328d3791 kernel/rcu/tree.c Paul E. McKenney 2014-06-20 1243 */ c06aed0e31008a kernel/rcu/tree.c Paul E. McKenney 2018-07-25 1244 jtsq = READ_ONCE(jiffies_to_sched_qs); 2dba13f0b6c2b2 kernel/rcu/tree.c Paul E. McKenney 2018-08-03 1245 ruqp = per_cpu_ptr(&rcu_data.rcu_urgent_qs, rdp->cpu); 2dba13f0b6c2b2 kernel/rcu/tree.c Paul E. McKenney 2018-08-03 1246 rnhqp = &per_cpu(rcu_data.rcu_need_heavy_qs, rdp->cpu); 0f9be8cabbc343 kernel/rcu/tree.c Paul E. McKenney 2017-01-27 1247 if (!READ_ONCE(*rnhqp) && 7e28c5af4ef6b5 kernel/rcu/tree.c Paul E. McKenney 2018-07-11 1248 (time_after(jiffies, rcu_state.gp_start + jtsq * 2) || b2b00ddf193bf8 kernel/rcu/tree.c Paul E. McKenney 2019-10-30 1249 time_after(jiffies, rcu_state.jiffies_resched) || b2b00ddf193bf8 kernel/rcu/tree.c Paul E. McKenney 2019-10-30 1250 rcu_state.cbovld)) { 0f9be8cabbc343 kernel/rcu/tree.c Paul E. McKenney 2017-01-27 1251 WRITE_ONCE(*rnhqp, true); 9226b10d78ffe7 kernel/rcu/tree.c Paul E. McKenney 2017-01-27 1252 /* Store rcu_need_heavy_qs before rcu_urgent_qs. */ 9226b10d78ffe7 kernel/rcu/tree.c Paul E. McKenney 2017-01-27 1253 smp_store_release(ruqp, true); 7e28c5af4ef6b5 kernel/rcu/tree.c Paul E. McKenney 2018-07-11 1254 } else if (time_after(jiffies, rcu_state.gp_start + jtsq)) { 7e28c5af4ef6b5 kernel/rcu/tree.c Paul E. McKenney 2018-07-11 1255 WRITE_ONCE(*ruqp, true); 6193c76aba8ec3 kernel/rcu/tree.c Paul E. McKenney 2013-09-23 1256 } 6193c76aba8ec3 kernel/rcu/tree.c Paul E. McKenney 2013-09-23 1257 28053bc72c0e58 kernel/rcu/tree.c Paul E. McKenney 2016-12-01 1258 /* c98cac603f1ce7 kernel/rcu/tree.c Paul E. McKenney 2018-11-21 1259 * NO_HZ_FULL CPUs can run in-kernel without rcu_sched_clock_irq! d3052109c0bc9e kernel/rcu/tree.c Paul E. McKenney 2018-07-25 1260 * The above code handles this, but only for straight cond_resched(). d3052109c0bc9e kernel/rcu/tree.c Paul E. McKenney 2018-07-25 1261 * And some in-kernel loops check need_resched() before calling d3052109c0bc9e kernel/rcu/tree.c Paul E. McKenney 2018-07-25 1262 * cond_resched(), which defeats the above code for CPUs that are d3052109c0bc9e kernel/rcu/tree.c Paul E. McKenney 2018-07-25 1263 * running in-kernel with scheduling-clock interrupts disabled. d3052109c0bc9e kernel/rcu/tree.c Paul E. McKenney 2018-07-25 1264 * So hit them over the head with the resched_cpu() hammer! d3052109c0bc9e kernel/rcu/tree.c Paul E. McKenney 2018-07-25 1265 */ d3052109c0bc9e kernel/rcu/tree.c Paul E. McKenney 2018-07-25 1266 if (tick_nohz_full_cpu(rdp->cpu) && b2b00ddf193bf8 kernel/rcu/tree.c Paul E. McKenney 2019-10-30 1267 (time_after(jiffies, READ_ONCE(rdp->last_fqs_resched) + jtsq * 3) || b2b00ddf193bf8 kernel/rcu/tree.c Paul E. McKenney 2019-10-30 1268 rcu_state.cbovld)) { 05ef9e9eb3dade kernel/rcu/tree.c Joel Fernandes (Google 2019-08-15 1269) WRITE_ONCE(*ruqp, true); d3052109c0bc9e kernel/rcu/tree.c Paul E. McKenney 2018-07-25 1270 resched_cpu(rdp->cpu); d3052109c0bc9e kernel/rcu/tree.c Paul E. McKenney 2018-07-25 1271 WRITE_ONCE(rdp->last_fqs_resched, jiffies); 6193c76aba8ec3 kernel/rcu/tree.c Paul E. McKenney 2013-09-23 1272 } 6193c76aba8ec3 kernel/rcu/tree.c Paul E. McKenney 2013-09-23 1273 28053bc72c0e58 kernel/rcu/tree.c Paul E. McKenney 2016-12-01 1274 /* d3052109c0bc9e kernel/rcu/tree.c Paul E. McKenney 2018-07-25 1275 * If more than halfway to RCU CPU stall-warning time, invoke d3052109c0bc9e kernel/rcu/tree.c Paul E. McKenney 2018-07-25 1276 * resched_cpu() more frequently to try to loosen things up a bit. d3052109c0bc9e kernel/rcu/tree.c Paul E. McKenney 2018-07-25 1277 * Also check to see if the CPU is getting hammered with interrupts, d3052109c0bc9e kernel/rcu/tree.c Paul E. McKenney 2018-07-25 1278 * but only once per grace period, just to keep the IPIs down to d3052109c0bc9e kernel/rcu/tree.c Paul E. McKenney 2018-07-25 1279 * a dull roar. 28053bc72c0e58 kernel/rcu/tree.c Paul E. McKenney 2016-12-01 1280 */ 7e28c5af4ef6b5 kernel/rcu/tree.c Paul E. McKenney 2018-07-11 1281 if (time_after(jiffies, rcu_state.jiffies_resched)) { d3052109c0bc9e kernel/rcu/tree.c Paul E. McKenney 2018-07-25 1282 if (time_after(jiffies, d3052109c0bc9e kernel/rcu/tree.c Paul E. McKenney 2018-07-25 1283 READ_ONCE(rdp->last_fqs_resched) + jtsq)) { 28053bc72c0e58 kernel/rcu/tree.c Paul E. McKenney 2016-12-01 1284 resched_cpu(rdp->cpu); d3052109c0bc9e kernel/rcu/tree.c Paul E. McKenney 2018-07-25 1285 WRITE_ONCE(rdp->last_fqs_resched, jiffies); d3052109c0bc9e kernel/rcu/tree.c Paul E. McKenney 2018-07-25 1286 } 9b9500da815027 kernel/rcu/tree.c Paul E. McKenney 2017-08-17 1287 if (IS_ENABLED(CONFIG_IRQ_WORK) && 8aa670cdacc182 kernel/rcu/tree.c Paul E. McKenney 2018-04-28 1288 !rdp->rcu_iw_pending && rdp->rcu_iw_gp_seq != rnp->gp_seq && 9b9500da815027 kernel/rcu/tree.c Paul E. McKenney 2017-08-17 1289 (rnp->ffmask & rdp->grpmask)) { 9b9500da815027 kernel/rcu/tree.c Paul E. McKenney 2017-08-17 1290 rdp->rcu_iw_pending = true; 8aa670cdacc182 kernel/rcu/tree.c Paul E. McKenney 2018-04-28 1291 rdp->rcu_iw_gp_seq = rnp->gp_seq; 9b9500da815027 kernel/rcu/tree.c Paul E. McKenney 2017-08-17 @1292 irq_work_queue_on(&rdp->rcu_iw, rdp->cpu); 9b9500da815027 kernel/rcu/tree.c Paul E. McKenney 2017-08-17 1293 } 9b9500da815027 kernel/rcu/tree.c Paul E. McKenney 2017-08-17 1294 } 4914950aaa12de kernel/rcu/tree.c Paul E. McKenney 2015-12-11 1295 a82dcc76021e22 kernel/rcutree.c Paul E. McKenney 2012-08-01 1296 return 0; 64db4cfff99c04 kernel/rcutree.c Paul E. McKenney 2008-12-18 1297 } 64db4cfff99c04 kernel/rcutree.c Paul E. McKenney 2008-12-18 1298 :::::: The code at line 1292 was first introduced by commit :::::: 9b9500da81502738efa1b485a8835f174ff7be6d rcu: Make RCU CPU stall warnings check for irq-disabled CPUs :::::: TO: Paul E. McKenney <paulmck(a)linux.vnet.ibm.com&gt; :::::: CC: Paul E. McKenney <paulmck(a)linux.vnet.ibm.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org