2 files changed, 10 insertions, 2 deletions
diff --git a/synapse/app/__init__.py b/synapse/app/__init__.py
index 4a9b0129c3..d1a2cd5e19 100644
--- a/synapse/app/__init__.py
+++ b/synapse/app/__init__.py
@@ -22,7 +22,9 @@ logger = logging.getLogger(__name__)
 try:
     python_dependencies.check_requirements()
 except python_dependencies.DependencyException as e:
-    sys.stderr.writelines(e.message)
+    sys.stderr.writelines(
+        e.message  # noqa: B306, DependencyException.message is a property
+    )
     sys.exit(1)
 
 
diff --git a/synapse/app/generic_worker.py b/synapse/app/generic_worker.py
index 274d582d07..caef394e1d 100644
--- a/synapse/app/generic_worker.py
+++ b/synapse/app/generic_worker.py
@@ -302,6 +302,8 @@ class GenericWorkerPresence(BasePresenceHandler):
             self.send_stop_syncing, UPDATE_SYNCING_USERS_MS
         )
 
+        self._busy_presence_enabled = hs.config.experimental.msc3026_enabled
+
         hs.get_reactor().addSystemEventTrigger(
             "before",
             "shutdown",
@@ -439,8 +441,12 @@ class GenericWorkerPresence(BasePresenceHandler):
             PresenceState.ONLINE,
             PresenceState.UNAVAILABLE,
             PresenceState.OFFLINE,
+            PresenceState.BUSY,
         )
-        if presence not in valid_presence:
+
+        if presence not in valid_presence or (
+            presence == PresenceState.BUSY and not self._busy_presence_enabled
+        ):
             raise SynapseError(400, "Invalid presence state")
 
         user_id = target_user.to_string()