Fix up

Author: Tabrizian

src/pb_stub.cc

@@ -659,6 +659,7 @@ Stub::ProcessRequests(RequestBatch* request_batch_shm_ptr)
   bool has_exception = false;
   std::string error_string;
   std::unique_ptr<PbString> error_string_shm;
+  std::string err_message;
 
   ScopedDefer execute_finalize([this] { stub_message_queue_->Pop(); });
   ScopedDefer _(
@@ -705,11 +706,10 @@ Stub::ProcessRequests(RequestBatch* request_batch_shm_ptr)
   }
 
   if (has_exception) {
-    std::string err_message =
-        std::string(
-            "Failed to process the request(s) for model '" + name_ +
-            "', message: ") +
-        error_string;
+    err_message = std::string(
+                      "Failed to process the request(s) for model '" + name_ +
+                      "', message: ") +
+                  error_string;
     LOG_ERROR << err_message.c_str();
     if (!response_batch) {
       response_batch = shm_pool_->Construct<char>(
@@ -718,12 +718,11 @@ Stub::ProcessRequests(RequestBatch* request_batch_shm_ptr)
     ResponseBatch* response_batch_shm_ptr = reinterpret_cast<ResponseBatch*>(
         response_batch.value().data_.get() + sizeof(IPCMessageShm));
 
-    response_batch_shm_ptr =
-        reinterpret_cast<ResponseBatch*>(response_batch.value().data_.get());
     response_batch_shm_ptr->has_error = true;
     error_string_shm = PbString::Create(shm_pool_, err_message);
     response_batch_shm_ptr->error = error_string_shm->ShmHandle();
     response_batch_shm_ptr->is_error_set = true;
+    response_batch_shm_ptr->batch_size = 0;
     // Once the error is sent to the backend, the backend is supposed to close
     // all response factories if not already closed, so closing all response
     // senders if not already closed to prevent the model from sending more
@@ -732,23 +731,25 @@ Stub::ProcessRequests(RequestBatch* request_batch_shm_ptr)
       InferRequest* request = py_request.cast<InferRequest*>();
       request->GetResponseSender()->Close();
     }
-  }
-
-  if (!response_batch) {
-    response_batch = shm_pool_->Construct<char>(
-        sizeof(ResponseBatch) + sizeof(IPCMessageShm));
+  } else {
+    if (!response_batch) {
+      response_batch = shm_pool_->Construct<char>(
+          sizeof(ResponseBatch) + sizeof(IPCMessageShm));
+      ResponseBatch* response_batch_shm_ptr = reinterpret_cast<ResponseBatch*>(
+          response_batch.value().data_.get() + sizeof(IPCMessageShm));
+      response_batch_shm_ptr->batch_size = 0;
+    }
     ResponseBatch* response_batch_shm_ptr = reinterpret_cast<ResponseBatch*>(
         response_batch.value().data_.get() + sizeof(IPCMessageShm));
-    response_batch_shm_ptr->batch_size = 0;
+    response_batch_shm_ptr->has_error = false;
+    response_batch_shm_ptr->is_error_set = false;
   }
-  ResponseBatch* response_batch_shm_ptr = reinterpret_cast<ResponseBatch*>(
-      response_batch.value().data_.get() + sizeof(IPCMessageShm));
-  response_batch_shm_ptr->has_error = false;
-  response_batch_shm_ptr->is_error_set = false;
+
   execute_response = IPCMessage::Create(
       reinterpret_cast<IPCMessageShm*>(response_batch.value().data_.get()),
       response_batch.value().handle_);
-  execute_response->Args() = response_batch.value().handle_;
+  execute_response->Args() =
+      response_batch.value().handle_ + sizeof(IPCMessageShm);
   execute_response->InlineResponse() = false;
   execute_response->Command() = PYTHONSTUB_ExecuteResponse;
   _.Complete();