Fix logging error on SIGHUP (#14258)

2 files changed, 3 insertions, 1 deletions

diff --git a/changelog.d/14258.bugfix b/changelog.d/14258.bugfix
new file mode 100644

index 0000000000..de97945844
--- /dev/null
+++ b/changelog.d/14258.bugfix
@@ -0,0 +1,2 @@
+Fix a bug introduced in Synapse 1.60.0 which caused an error to be logged when Synapse received a SIGHUP signal, and debug logging was enabled.
+
diff --git a/synapse/app/_base.py b/synapse/app/_base.py

index 000912e86e..a683ebf4cb 100644
--- a/synapse/app/_base.py
+++ b/synapse/app/_base.py
@@ -558,7 +558,7 @@ def reload_cache_config(config: HomeServerConfig) -> None:
             logger.warning(f)
     else:
         logger.debug(
-            "New cache config. Was:\n %s\nNow:\n",
+            "New cache config. Was:\n %s\nNow:\n %s",
             previous_cache_config.__dict__,
             config.caches.__dict__,
         )