Index: kernel/generic/src/ipc/ipc.c
===================================================================
--- kernel/generic/src/ipc/ipc.c	(revision f40237fcfcd22953855c5c0f39d199c569596c32)
+++ kernel/generic/src/ipc/ipc.c	(revision fce9b1997fdc43a3facf95c6dc33e2b4de41269d)
@@ -960,4 +960,7 @@
 	irq_spinlock_lock(&task->answerbox.lock, false);
 
+	printf("Active calls: %" PRIun "\n",
+	    atomic_get(&task->answerbox.active_calls));
+
 #ifdef __32_BITS__
 	printf("[call id ] [method] [arg1] [arg2] [arg3] [arg4] [arg5]"