diff --git a/python/jittor/__init__.py b/python/jittor/__init__.py
index 04176c2f..b0310732 100644
--- a/python/jittor/__init__.py
+++ b/python/jittor/__init__.py
@@ -9,7 +9,7 @@
 # file 'LICENSE.txt', which is part of this source code package.
 # ***************************************************************
 
-__version__ = '1.3.5.39'
+__version__ = '1.3.5.40'
 from jittor_utils import lock
 with lock.lock_scope():
     ori_int = int
diff --git a/python/jittor/src/mem/mem_info.cc b/python/jittor/src/mem/mem_info.cc
index 235947a8..6b865a6d 100644
--- a/python/jittor/src/mem/mem_info.cc
+++ b/python/jittor/src/mem/mem_info.cc
@@ -55,6 +55,8 @@ std::ostream& operator<<(std::ostream& os, const FloatOutput& o) {
     return os << o.suffix;
 }
 
+unordered_map<int64, VarPtr>* _grad_backup_ptr = nullptr;
+
 void display_memory_info(const char* fileline, bool dump_var, bool red_color) {
     int p = 3;
     Log log(fileline, red_color?'e':'i', 0);
@@ -66,6 +68,8 @@ void display_memory_info(const char* fileline, bool dump_var, bool red_color) {
     log << "hold_vars:" << hold_vars.size()
         << "lived_vars:" << Var::number_of_lived_vars
         << "lived_ops:" << Op::number_of_lived_ops >> '\n';
+    if (_grad_backup_ptr)
+        log << "jtorch_grad_vars:" << _grad_backup_ptr->size() >> '\n';
 
     // get the oldest var
     if (trace_py_var) {
@@ -93,10 +97,38 @@ void display_memory_info(const char* fileline, bool dump_var, bool red_color) {
                 cnt.erase(x.first);
             }
         }
-        LOGe << stat << lived_nodes_id.size();
-        for (auto nid : lived_nodes_id) {
-            if (!cnt.count(nid.first)) {
-                LOGe << nid;
+        LOGe << "appear time -> node cnt:" << stat;
+        if (lived_nodes_id.size()) {
+            LOGe << "lived_nodes cnt:" << lived_nodes_id.size();
+            Node* not_found=nullptr;
+            int not_found_cnt = 0;
+            for (auto nid : lived_nodes_id) {
+                if (!cnt.count(nid.first)) {
+                    not_found_cnt ++;
+                    if (!not_found) not_found = nid.second;
+                }
+            }
+            LOGe << "Total not_found:" << not_found_cnt;
+            if (not_found)
+                LOGe << "not found node:" << not_found;
+            if (_grad_backup_ptr) {
+                Node* not_found_grad=nullptr;
+                int parent_id = 0;
+                int not_found_grad_cnt = 0;
+                for (auto& gid : *_grad_backup_ptr) {
+                    if (!lived_nodes_id.count(gid.first)) {
+                        not_found_grad_cnt ++;
+                        if (!not_found_grad) {
+                            not_found_grad = gid.second.ptr;
+                            parent_id = gid.first;
+                        }
+                    }
+                }
+                LOGe << "Grad not found cnt:" << not_found_grad_cnt;
+                if (not_found_grad) {
+                    LOGe << "grad not found node" << not_found_grad;
+                    LOGe << "parent id:" << parent_id;
+                }
             }
         }
     }
diff --git a/python/jittor/utils/data.gz b/python/jittor/utils/data.gz
index a41b6e52..5af90667 100644
Binary files a/python/jittor/utils/data.gz and b/python/jittor/utils/data.gz differ