piiswrong commented on a change in pull request #9681: Better Exception 
Handling for Operators
URL: https://github.com/apache/incubator-mxnet/pull/9681#discussion_r165725747
 
 

 ##########
 File path: src/engine/threaded_engine.cc
 ##########
 @@ -356,7 +357,11 @@ void ThreadedEngine::DeleteVariable(SyncFn delete_fn,
 void ThreadedEngine::WaitForVar(VarHandle var) {
   BulkFlush();
   ThreadedVar* threaded_var = ThreadedVar::CastFromBase(var);
-  if (threaded_var->ready_to_read()) return;
+  if (threaded_var->ready_to_read()) {
+    if (threaded_var->ex_ptr) {
+      std::rethrow_exception(threaded_var->ex_ptr);
+    }
+  }
 
 Review comment:
   why are you not returning?

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