From d10a85ec9eac6f31aa82a5f07d74e5914b18b320 Mon Sep 17 00:00:00 2001
From: David Robertson <davidr@element.io>
Date: Thu, 10 Nov 2022 12:17:46 +0000
Subject: [PATCH] Quieter logging for stateres failure at missing prev events
 (#14346)

---
 changelog.d/14346.misc               | 1 +
 synapse/handlers/federation_event.py | 5 ++---
 2 files changed, 3 insertions(+), 3 deletions(-)
 create mode 100644 changelog.d/14346.misc

diff --git a/changelog.d/14346.misc b/changelog.d/14346.misc
new file mode 100644
index 000000000..9833b0733
--- /dev/null
+++ b/changelog.d/14346.misc
@@ -0,0 +1 @@
+Concisely log a failure to resolve state due to missing `prev_events`.
diff --git a/synapse/handlers/federation_event.py b/synapse/handlers/federation_event.py
index 9ca5df7c7..f7223b03c 100644
--- a/synapse/handlers/federation_event.py
+++ b/synapse/handlers/federation_event.py
@@ -1065,10 +1065,9 @@ class FederationEventHandler:
                 state_res_store=StateResolutionStore(self._store),
             )
 
-        except Exception:
+        except Exception as e:
             logger.warning(
-                "Error attempting to resolve state at missing prev_events",
-                exc_info=True,
+                "Error attempting to resolve state at missing prev_events: %s", e
             )
             raise FederationError(
                 "ERROR",