diff --git a/storage/innobase/fil/fil0fil.cc b/storage/innobase/fil/fil0fil.cc
index b757818241d..5b5284d1fa7 100644
--- a/storage/innobase/fil/fil0fil.cc
+++ b/storage/innobase/fil/fil0fil.cc
@@ -8706,6 +8706,11 @@ bool Fil_system::encryption_rotate_in_a_shard(Fil_shard *shard) {
       here. */
       MDL_ticket *mdl_ticket = nullptr;
       if (fsp_is_undo_tablespace(space->id)) {
+
+	if (strcmp(space->name, "undo_003") == 0) {
+		DEBUG_SYNC_C("undo_rotate");
+	}
+
         THD *thd = current_thd;
         while (
             acquire_shared_backup_lock(thd, thd->variables.lock_wait_timeout)) {
diff --git a/storage/innobase/log/log0ddl.cc b/storage/innobase/log/log0ddl.cc
index 5bd6c06590a..cb11c9fab1e 100644
--- a/storage/innobase/log/log0ddl.cc
+++ b/storage/innobase/log/log0ddl.cc
@@ -1607,6 +1607,10 @@ void Log_DDL::replay_delete_space_log(space_id_t space_id,
     mutex_exit(&dict_sys->mutex);
   }
 
+  if (fsp_is_undo_tablespace(space_id)) {
+	  DEBUG_SYNC_C("drop_undo");
+  }
+
   /* Require the mutex to block key rotation. Please note that
   here we don't know if this tablespace is encrypted or not,
   so just acquire the mutex unconditionally. */