Index: head/sys/kern/subr_gtaskqueue.c
===================================================================
--- head/sys/kern/subr_gtaskqueue.c
+++ head/sys/kern/subr_gtaskqueue.c
@@ -663,7 +663,7 @@
     void *uniq, int irq, char *name)
 {
 	cpuset_t mask;
-	int qid;
+	int qid, error;
 
 	gtask->gt_uniq = uniq;
 	gtask->gt_name = name;
@@ -679,7 +679,9 @@
 		CPU_ZERO(&mask);
 		CPU_SET(qgroup->tqg_queue[qid].tgc_cpu, &mask);
 		mtx_unlock(&qgroup->tqg_lock);
-		intr_setaffinity(irq, CPU_WHICH_IRQ, &mask);
+		error = intr_setaffinity(irq, CPU_WHICH_IRQ, &mask);
+		if (error)
+			printf("%s: setaffinity failed: %d\n", __func__, error);
 	} else
 		mtx_unlock(&qgroup->tqg_lock);
 }
@@ -688,7 +690,7 @@
 taskqgroup_attach_deferred(struct taskqgroup *qgroup, struct grouptask *gtask)
 {
 	cpuset_t mask;
-	int qid, cpu;
+	int qid, cpu, error;
 
 	mtx_lock(&qgroup->tqg_lock);
 	qid = taskqgroup_find(qgroup, gtask->gt_uniq);
@@ -698,9 +700,11 @@
 
 		CPU_ZERO(&mask);
 		CPU_SET(cpu, &mask);
-		intr_setaffinity(gtask->gt_irq, CPU_WHICH_IRQ, &mask);
-
+		error = intr_setaffinity(gtask->gt_irq, CPU_WHICH_IRQ, &mask);
 		mtx_lock(&qgroup->tqg_lock);
+		if (error)
+			printf("%s: setaffinity failed: %d\n", __func__, error);
+
 	}
 	qgroup->tqg_queue[qid].tgc_cnt++;
 
@@ -716,7 +720,7 @@
 	void *uniq, int cpu, int irq, char *name)
 {
 	cpuset_t mask;
-	int i, qid;
+	int i, qid, error;
 
 	qid = -1;
 	gtask->gt_uniq = uniq;
@@ -732,6 +736,7 @@
 			}
 		if (qid == -1) {
 			mtx_unlock(&qgroup->tqg_lock);
+			printf("%s: qid not found for %s cpu=%d\n", __func__, name, cpu);
 			return (EINVAL);
 		}
 	} else
@@ -744,8 +749,11 @@
 
 	CPU_ZERO(&mask);
 	CPU_SET(cpu, &mask);
-	if (irq != -1 && tqg_smp_started)
-		intr_setaffinity(irq, CPU_WHICH_IRQ, &mask);
+	if (irq != -1 && tqg_smp_started) {
+		error = intr_setaffinity(irq, CPU_WHICH_IRQ, &mask);
+		if (error)
+			printf("%s: setaffinity failed: %d\n", __func__, error);
+	}
 	return (0);
 }
 
@@ -753,7 +761,7 @@
 taskqgroup_attach_cpu_deferred(struct taskqgroup *qgroup, struct grouptask *gtask)
 {
 	cpuset_t mask;
-	int i, qid, irq, cpu;
+	int i, qid, irq, cpu, error;
 
 	qid = -1;
 	irq = gtask->gt_irq;
@@ -767,6 +775,7 @@
 		}
 	if (qid == -1) {
 		mtx_unlock(&qgroup->tqg_lock);
+		printf("%s: qid not found for %s cpu=%d\n", __func__, name, cpu);
 		return (EINVAL);
 	}
 	qgroup->tqg_queue[qid].tgc_cnt++;
@@ -778,8 +787,11 @@
 	CPU_ZERO(&mask);
 	CPU_SET(cpu, &mask);
 
-	if (irq != -1)
-		intr_setaffinity(irq, CPU_WHICH_IRQ, &mask);
+	if (irq != -1) {
+		error = intr_setaffinity(irq, CPU_WHICH_IRQ, &mask);
+		if (error)
+			printf("%s: setaffinity failed: %d\n", __func__, error);
+	}
 	return (0);
 }
 
@@ -815,7 +827,7 @@
 	thread_unlock(curthread);
 
 	if (error)
-		printf("taskqgroup_binder: setaffinity failed: %d\n",
+		printf("%s: setaffinity failed: %d\n", __func__,
 		    error);
 	free(gtask, M_DEVBUF);
 }
@@ -858,7 +870,7 @@
 		return (EINVAL);
 	}
 	if (qgroup->tqg_adjusting) {
-		printf("taskqgroup_adjust failed: adjusting\n");
+		printf("%s failed: adjusting\n", __func__);
 		return (EBUSY);
 	}
 	qgroup->tqg_adjusting = 1;