do not try to find manage frames when stepping out from either, last managed...

do not try to find manage frames when stepping out from either, last managed frame or frame in between managed/native ones (fix case #573949)

mono/mini/debugger-agent.c

@@ -4295,6 +4295,24 @@ ss_start (SingleStepReq *ss_req, MonoMethod *method, SeqPoint *sp, MonoSeqPointI
 	}
 }
 
+
+static gboolean
+is_parentframe_managed(DebuggerTlsData* tls)
+{
+	// if we have 0 frames, that should never happen anyway.
+	// if we have 1 frame, our parent is defenitely native.
+	if (tls->frame_count < 2)
+		return FALSE;
+
+	//if we have at least two frames, the parent could be native.  if it is, then the tls->invoke_addr,
+	//which is the value of the stackpointer when the last mono_runtime_invoke was done, should be "more pushed"
+	//on the stack than the stackpointer of the candidate parent frame.
+	if (tls->invoke_addr <= MONO_CONTEXT_GET_SP(&tls->frames[1]->ctx))
+		return FALSE;
+
+	return TRUE;
+}
+
 /*
  * Start single stepping of thread THREAD
  */
@@ -4341,6 +4359,12 @@ ss_create (MonoInternalThread *thread, StepSize size, StepDepth depth, EventRequ
 		g_assert (tls->frame_count);
 		frame = tls->frames [0];
 
+		if (ss_req->depth == STEP_DEPTH_OUT && !is_parentframe_managed(tls))
+		{
+			ss_destroy(ss_req);
+			return ERR_NO_INVOCATION;
+		}
+
 		ss_req->last_method = frame->method;
 		ss_req->last_line = -1;