Index: head/sys/kern/subr_kdb.c
===================================================================
--- head/sys/kern/subr_kdb.c
+++ head/sys/kern/subr_kdb.c
@@ -652,9 +652,7 @@
 	struct kdb_dbbe *be;
 	register_t intr;
 	int handled;
-#ifdef SMP
 	int did_stop_cpus;
-#endif
 
 	be = kdb_dbbe;
 	if (be == NULL || be->dbbe_trap == NULL)
@@ -666,16 +664,17 @@
 
 	intr = intr_disable();
 
-#ifdef SMP
 	if (!SCHEDULER_STOPPED()) {
+#ifdef SMP
 		other_cpus = all_cpus;
 		CPU_NAND(&other_cpus, &stopped_cpus);
 		CPU_CLR(PCPU_GET(cpuid), &other_cpus);
 		stop_cpus_hard(other_cpus);
+#endif
+		curthread->td_stopsched = 1;
 		did_stop_cpus = 1;
 	} else
 		did_stop_cpus = 0;
-#endif
 
 	kdb_active++;
 
@@ -703,12 +702,13 @@
 
 	kdb_active--;
 
-#ifdef SMP
 	if (did_stop_cpus) {
+		curthread->td_stopsched = 0;
+#ifdef SMP
 		CPU_AND(&other_cpus, &stopped_cpus);
 		restart_cpus(other_cpus);
-	}
 #endif
+	}
 
 	intr_restore(intr);