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-rw-r--r--synapse/handlers/room.py31
1 files changed, 19 insertions, 12 deletions
diff --git a/synapse/handlers/room.py b/synapse/handlers/room.py
index ec300d8877..e73031475f 100644
--- a/synapse/handlers/room.py
+++ b/synapse/handlers/room.py
@@ -771,22 +771,29 @@ class RoomCreationHandler(BaseHandler):
                 ratelimit=False,
             )
 
-        for invitee in invite_list:
+        # we avoid dropping the lock between invites, as otherwise joins can
+        # start coming in and making the createRoom slow.
+        #
+        # we also don't need to check the requester's shadow-ban here, as we
+        # have already done so above (and potentially emptied invite_list).
+        with (await self.room_member_handler.member_linearizer.queue((room_id,))):
             content = {}
             is_direct = config.get("is_direct", None)
             if is_direct:
                 content["is_direct"] = is_direct
 
-            # Note that update_membership with an action of "invite" can raise a
-            # ShadowBanError, but this was handled above by emptying invite_list.
-            _, last_stream_id = await self.room_member_handler.update_membership(
-                requester,
-                UserID.from_string(invitee),
-                room_id,
-                "invite",
-                ratelimit=False,
-                content=content,
-            )
+            for invitee in invite_list:
+                (
+                    _,
+                    last_stream_id,
+                ) = await self.room_member_handler.update_membership_locked(
+                    requester,
+                    UserID.from_string(invitee),
+                    room_id,
+                    "invite",
+                    ratelimit=False,
+                    content=content,
+                )
 
         for invite_3pid in invite_3pid_list:
             id_server = invite_3pid["id_server"]
@@ -1268,7 +1275,7 @@ class RoomShutdownHandler:
             )
 
             # We now wait for the create room to come back in via replication so
-            # that we can assume that all the joins/invites have propogated before
+            # that we can assume that all the joins/invites have propagated before
             # we try and auto join below.
             await self._replication.wait_for_stream_position(
                 self.hs.config.worker.events_shard_config.get_instance(new_room_id),