diff --git a/changelog.d/13256.misc b/changelog.d/13256.misc
new file mode 100644
index 000000000000..5fc1388520b5
--- /dev/null
+++ b/changelog.d/13256.misc
@@ -0,0 +1 @@
+Log the stack when waiting for an entire room to be un-partial stated.
diff --git a/synapse/storage/util/partial_state_events_tracker.py b/synapse/storage/util/partial_state_events_tracker.py
index 211437cfaa99..466e5137f2d3 100644
--- a/synapse/storage/util/partial_state_events_tracker.py
+++ b/synapse/storage/util/partial_state_events_tracker.py
@@ -166,6 +166,7 @@ async def await_full_state(self, room_id: str) -> None:
             logger.info(
                 "Awaiting un-partial-stating of room %s",
                 room_id,
+                stack_info=True,
             )
 
             await make_deferred_yieldable(d)