From 7bc5889b0244666cf47a94d54a6deddaada8c6b8 Mon Sep 17 00:00:00 2001
From: Richard van der Hoff <richard@matrix.org>
Date: Fri, 21 Oct 2022 13:54:48 +0100
Subject: [PATCH] Fix logging error on SIGHUP

Fixes #14257
---
 changelog.d/14258.bugfix | 2 ++
 synapse/app/_base.py     | 2 +-
 2 files changed, 3 insertions(+), 1 deletion(-)
 create mode 100644 changelog.d/14258.bugfix

diff --git a/changelog.d/14258.bugfix b/changelog.d/14258.bugfix
new file mode 100644
index 000000000000..de979458449e
--- /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 000912e86ee9..a683ebf4cbe9 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__,
         )