diff --git a/gralloc/gr_buf_mgr.cpp b/gralloc/gr_buf_mgr.cpp
index 3d4bfac..a569184 100644
--- a/gralloc/gr_buf_mgr.cpp
+++ b/gralloc/gr_buf_mgr.cpp
@@ -335,6 +335,7 @@
 }
 
 Error BufferManager::Dump(std::ostringstream *os) {
+  std::lock_guard<std::mutex> buffer_lock(buffer_lock_);
   for (auto it : handles_map_) {
     auto buf = it.second;
     auto hnd = buf->handle;