Because of the three-day break, my response is late.
8.1.8 is pretty old. Also you'll have better luck getting help if you actually include the output from Valgrind.
the output from Valgrind is not stored. from now on, I will do it again and get the result from Valgrind.
PS: the memory leak scenario is not only got from Valgrind, but also from the period output of top command.
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