Add additional data bytes to flag the buf.

fujuntang

2021-09-07 8cd8c6fe8ac20bc4793a246a565cf68ee077d7ae

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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