memcheck - What does possible lost means in valgrind -

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i have lot of possible lost entry valgrind. mean ? using sqlite , tested. don't think these correct entry. doing wrong ?

 16 bytes in 1 blocks possibly lost in loss record 30 of 844     ==23027==    @ 0x4a05e1c: malloc (vg_replace_malloc.c:195)     ==23027==    0x6525be: sqlite3memmalloc (in app_mem.out)     ==23027==    0x63c579: mallocwithalarm (in app_mem.out)     ==23027==    0x63c904: sqlite3dbmallocraw (in app_mem.out)     ==23027==    0x6886d6: codeoneloopstart (in app_mem.out)     ==23027==    0x68a9c8: sqlite3wherebegin (in app_mem.out)     ==23027==    0x68cc9e: sqlite3select (in app_mem.out)     ==23027==    0x6a8644: yy_reduce (in app_mem.out)     ==23027==    0x6aaeac: sqlite3parser (in app_mem.out)     ==23027==    0x6ab357: sqlite3runparser (in app_mem.out)     ==23027==    0x6adf84: sqlite3prepare (in app_mem.out)     ==23027==    0x6ae82b: sqlite3lockandprepare (in app_mem.out)

i had same curiosity after using sqlite valgrind , came bug entry indicates in sqlite's case false positive. seem sqlite indeed use interior-pointers causing valgrind respond.

"bug 573688 has new information -- these "possible leaks" , false positives because sqlite moves pointers heap blocks 8 bytes in start of block. easiest way fix extend valgrind suppress "possible leak" reports specifically; can suppress leaks, dangerous sqlite leaks never caught. (though suppose reasonable step in meantime.)"

bug 639408 - suppress sqlite leaks in valgrind runs


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