fix from 3.1 first commit

fujuntang

2021-08-11 68d23225a38a35f1325eb39fa4ed5a005d5de473

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ipcrm -a
rm *.txt
./test_lostdata
sort -n c.txt  > c1.txt
sort -n p.txt  > p1.txt
diff -u p1.txt c1.txt