diff --git a/server/cros/tradefed_test.py b/server/cros/tradefed_test.py
index 79a4364..c1eb08a 100644
--- a/server/cros/tradefed_test.py
+++ b/server/cros/tradefed_test.py
@@ -640,8 +640,12 @@
         """Compute recursive size in bytes of directory."""
         size = 0
         for root, _, files in os.walk(directory):
-            size += sum(
-                os.path.getsize(os.path.join(root, name)) for name in files)
+            for name in files:
+                try:
+                    size += os.path.getsize(os.path.join(root, name))
+                except OSError:
+                    logging.error('Inaccessible path (crbug/793696): %s/%s',
+                                  root, name)
         return size
 
     def _clear_download_cache_if_needed(self):