Fix mem leak and recursive depth protection

ge/common/ge/tbe_plugin_manager.cc

@@ -156,6 +156,7 @@ void TBEPluginManager::FindParserSo(const string &path, vector<string> &file_lis
   }
   mmScandirFree(entries, ret);
   temp_depth--;
+  return;
 }
 
 void TBEPluginManager::GetPluginSoFileList(const string &path, vector<string> &file_list, string &caffe_parser_path) {

ge/hybrid/node_executor/task_context.cc

@@ -43,6 +43,7 @@ TaskContext::~TaskContext() {
       output_tensor->Destroy();
     }
   }
+  ReleaseWorkspace();
 }
 
 void TaskContext::ReleaseWorkspace() {
@@ -50,6 +51,7 @@ void TaskContext::ReleaseWorkspace() {
   for (auto ws_addr : workspaces_) {
     execution_context_->allocator->Deallocate(ws_addr);
   }
+  workspaces_.clear();
 }
 
 std::unique_ptr<TaskContext> TaskContext::Create(NodeState *node_state, SubgraphContext *subgraph_context) {