Fix the buf data parse issue.

Fu Juntang

2021-09-01 8dead3c23da957fce542d8483c7bce7d5a7232ed

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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