piiswrong commented on a change in pull request #9681: Better Exception 
Handling for Operators
URL: https://github.com/apache/incubator-mxnet/pull/9681#discussion_r165728359
 
 

 ##########
 File path: src/engine/threaded_engine.h
 ##########
 @@ -338,33 +346,46 @@ class ThreadedEngine : public Engine {
 #endif
     CallbackOnComplete callback = this->CreateCallback(
         ThreadedEngine::OnCompleteStatic, opr_block);
+    CallbackOnComplete on_start_callback = this->CreateCallback(
 
 Review comment:
   what's the point of creating a call back here?

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