diff --git a/tempest/api/compute/servers/test_device_tagging.py b/tempest/api/compute/servers/test_device_tagging.py
index 56456f4..f5c9080 100644
--- a/tempest/api/compute/servers/test_device_tagging.py
+++ b/tempest/api/compute/servers/test_device_tagging.py
@@ -335,7 +335,9 @@
     def verify_device_metadata(self, md_json):
         try:
             md_dict = json.loads(md_json)
-        except (json_decoder.JSONDecodeError, TypeError):
+        except (json_decoder.JSONDecodeError, TypeError) as e:
+            LOG.warning(
+                'Failed to decode json metadata: %s, %s', str(e), str(md_json))
             return False
 
         found_devices = [d['tags'][0] for d in md_dict['devices']
@@ -345,7 +347,9 @@
                 sorted(found_devices),
                 sorted(['nic-tag', 'volume-tag']))
             return True
-        except Exception:
+        except Exception as e:
+            LOG.warning(
+                'Failed to parse metadata: %s, %s', str(e), str(md_json))
             return False
 
     def verify_empty_devices(self, md_json):