From 211068b9a87bd795f8cf3ced12ac9aa3a9a89002 Mon Sep 17 00:00:00 2001
From: David Robertson <davidr@element.io>
Date: Tue, 1 Nov 2022 18:09:19 +0000
Subject: [PATCH 1/2] Quieter logging for stateres failure at missing prev
 events

Fixes #14344.
---
 synapse/handlers/federation_event.py | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/synapse/handlers/federation_event.py b/synapse/handlers/federation_event.py
index 9ca5df7c7894..f7223b03c364 100644
--- a/synapse/handlers/federation_event.py
+++ b/synapse/handlers/federation_event.py
@@ -1065,10 +1065,9 @@ async def _compute_event_context_with_maybe_missing_prevs(
                 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",

From ca22514be1d68ae2d55a397d08cf2bef4f000e50 Mon Sep 17 00:00:00 2001
From: David Robertson <davidr@element.io>
Date: Tue, 1 Nov 2022 18:11:37 +0000
Subject: [PATCH 2/2] Changelog

---
 changelog.d/14346.misc | 1 +
 1 file changed, 1 insertion(+)
 create mode 100644 changelog.d/14346.misc

diff --git a/changelog.d/14346.misc b/changelog.d/14346.misc
new file mode 100644
index 000000000000..9833b0733a04
--- /dev/null
+++ b/changelog.d/14346.misc
@@ -0,0 +1 @@
+Concisely log a failure to resolve state due to missing `prev_events`.