diff --git a/usr.sbin/bhyve/aarch64/vmexit.c b/usr.sbin/bhyve/aarch64/vmexit.c
--- a/usr.sbin/bhyve/aarch64/vmexit.c
+++ b/usr.sbin/bhyve/aarch64/vmexit.c
@@ -249,7 +249,8 @@
 			how = VM_SUSPEND_POWEROFF;
 		else
 			how = VM_SUSPEND_RESET;
-		vm_suspend(ctx, how);
+		error = vm_suspend(ctx, how);
+		assert(error == 0 || errno == EALREADY);
 		break;
 	default:
 		break;
diff --git a/usr.sbin/bhyve/bhyverun.c b/usr.sbin/bhyve/bhyverun.c
--- a/usr.sbin/bhyve/bhyverun.c
+++ b/usr.sbin/bhyve/bhyverun.c
@@ -413,7 +413,8 @@
 
 	CPU_SET_ATOMIC(vcpuid, &cpumask);
 
-	vm_suspend_cpu(vi->vcpu);
+	error = vm_suspend_cpu(vi->vcpu);
+	assert(error == 0);
 
 	error = pthread_create(&thr, NULL, fbsdrun_start_thread, vi);
 	assert(error == 0);