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-rw-r--r--synapse/handlers/device.py9
1 files changed, 8 insertions, 1 deletions
diff --git a/synapse/handlers/device.py b/synapse/handlers/device.py
index 5d12a39e26..d73d9dca08 100644
--- a/synapse/handlers/device.py
+++ b/synapse/handlers/device.py
@@ -1124,7 +1124,14 @@ class DeviceListUpdater(DeviceListWorkerUpdater):
                 )
 
             if resync:
-                await self.multi_user_device_resync([user_id])
+                # We mark as stale up front in case we get restarted.
+                await self.store.mark_remote_users_device_caches_as_stale([user_id])
+                run_as_background_process(
+                    "_maybe_retry_device_resync",
+                    self.multi_user_device_resync,
+                    [user_id],
+                    False,
+                )
             else:
                 # Simply update the single device, since we know that is the only
                 # change (because of the single prev_id matching the current cache)