From 3030e8c2784b64f9ac55a31429fb6146b4a348ac Mon Sep 17 00:00:00 2001
From: WangXi <wangxi16@baidu.com>
Date: Fri, 29 Apr 2022 10:22:55 +0800
Subject: [PATCH] fix lod_tensor_array gc (#42377)

---
 paddle/fluid/framework/executor_gc_helper.cc | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/paddle/fluid/framework/executor_gc_helper.cc b/paddle/fluid/framework/executor_gc_helper.cc
index 6dc53c9649..05215a9e5f 100644
--- a/paddle/fluid/framework/executor_gc_helper.cc
+++ b/paddle/fluid/framework/executor_gc_helper.cc
@@ -156,6 +156,9 @@ void DeleteUnusedTensors(const Scope &scope,
       for (auto &t : *lod_tensor_arr) {
         garbages.emplace_back(t.MoveMemoryHolder());
       }
+      // NOTE(wangxi): need clear the vector, otherwise lod_tensor_arr.size() is
+      // wrong, if size() decrease in next step, an error maybe occur.
+      lod_tensor_arr->clear();
     } else if (var->IsType<Strings>()) {
     } else {
       PADDLE_THROW(platform::errors::Unimplemented(
-- 
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