diff --git a/deps/oblib/src/lib/alloc/memory_dump.cpp b/deps/oblib/src/lib/alloc/memory_dump.cpp
index 55ecafae66..794d104de9 100644
--- a/deps/oblib/src/lib/alloc/memory_dump.cpp
+++ b/deps/oblib/src/lib/alloc/memory_dump.cpp
@@ -460,6 +460,7 @@ int label_stat(AChunk *chunk, ABlock *block, AObject *object,
         litem->count_ = 1;
         litem->block_cnt_ = 1;
         litem->chunk_cnt_ = 1;
+        ObSignalHandlerGuard guard(ob_signal_handler);
         ret = lmap.set_refactored(key, LabelInfoItem(litem, chunk, block));
       }
     }
@@ -484,6 +485,7 @@ int malloc_sample_stat(uint64_t tenant_id, uint64_t ctx_id,
       item->alloc_count_ += 1;
       item->alloc_bytes_ += offset;
     } else {
+      ObSignalHandlerGuard guard(ob_signal_handler);
       ret = malloc_sample_map.set_refactored(key, ObMallocSampleValue(1, offset));
     }
   }
diff --git a/deps/oblib/src/lib/signal/ob_signal_struct.h b/deps/oblib/src/lib/signal/ob_signal_struct.h
index 7f1fd5bbaa..264cbb6d02 100644
--- a/deps/oblib/src/lib/signal/ob_signal_struct.h
+++ b/deps/oblib/src/lib/signal/ob_signal_struct.h
@@ -32,6 +32,22 @@ extern const int MP_SIG; // MP means MULTI-PURPOSE
 extern const int SIG_STACK_SIZE;
 extern uint64_t g_rlimit_core;
 
+struct ObSignalHandlerGuard
+{
+public:
+  ObSignalHandlerGuard(signal_handler_t handler)
+    : last_(get_signal_handler())
+  {
+    get_signal_handler() = handler;
+  }
+  ~ObSignalHandlerGuard()
+  {
+    get_signal_handler() = last_;
+  }
+private:
+  const signal_handler_t last_;
+};
+
 class DTraceId
 {
 public: