okx ustctl --stop-trace $PID
okx ustctl --destroy-trace $PID
kill $PID
-kill -SIGTERM $UST_CONSUMERD_PID
-wait $UST_CONSUMERD_PID
+kill -SIGTERM ${UST_CONSUMERD_PID}
+wait ${UST_CONSUMERD_PID}
trace_matches -N "ust.malloc" "^ust.malloc:" "$TRACE_DIR"