Fix bugs on ubuntu22.04 (#54057)

paddle/fluid/distributed/collective/reducer.cc

@@ -829,9 +829,9 @@ void EagerReducer::MarkVarReady(const size_t var_index,
   const auto inside_group_index = var_locator.inside_group_index;
 
   auto &group = groups_[group_index];
-  auto &group_tensor = group.dense_tensors_[inside_group_index];
 
   if (!group.is_sparse_) {
+    auto &group_tensor = group.dense_tensors_[inside_group_index];
     const auto length = group.length_[inside_group_index];
     if (is_used_var) {
       auto *autograd_meta = tensors_[var_index].get_autograd_meta();

paddle/fluid/pybind/communication.cc

@@ -79,6 +79,7 @@ void BindTCPStore(py::module *m) {
                           const std::string &key) -> py::bytes {
                          auto data = self.get(key);
                          std::string s(data.begin(), data.end());
+                         py::gil_scoped_acquire acquire;
                          return py::bytes(s);
                        },
                        py::arg("key"),