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[libdbi-devel] possible leak in libdbi / mysql driver
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From: mimo <mi...@re...> - 2009-10-11 18:39:15
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I have been using libdbi for a long time now. Thanks for the great work to
everyone.
In a new server I'm working on I have noticed memory leaks and I think it's
down to libdbi or the mysql driver. I've written a simple test that opens and
closes a mysql connection - see below. Running this through valgrind's memory
checker gives a leak report for dbi_conn_connect (output attached further
down).
Any help would be greatly appreciated - btw my server (using 0.8.2) is multi-
threaded - I've seen previous posts here about libdbi and thread safety - and
I can confirm it's working fine if you take a couple of precautions. Let me know
if you want more detailed instructions..
Thanks,
mimo
<code>
#include <stdio.h>
#include <stdlib.h>
#include <mysql/mysql.h>
#include <string>
#include <iostream>
#include <dbi/dbi.h>
using namespace std;
int main() {
dbi_initialize(0);
dbi_conn con = dbi_conn_new("mysql");
dbi_conn_set_option(con, "username", "root");
dbi_conn_set_option(con, "dbname", "greylist");
if (dbi_conn_connect(con) != 0) {
cerr << "dbi_conn_connect() failed" << endl;
}
dbi_conn_close(con);
dbi_shutdown();
return 0;
}
</code>
valgrind --leak-check=full --show-reachable=yes --track-origins=yes
./dbi_mysql
==6633== Memcheck, a memory error detector.
==6633== Copyright (C) 2002-2008, and GNU GPL'd, by Julian Seward et al.
==6633== Using LibVEX rev 1884, a library for dynamic binary translation.
==6633== Copyright (C) 2004-2008, and GNU GPL'd, by OpenWorks LLP.
==6633== Using valgrind-3.4.1-Debian, a dynamic binary instrumentation
framework.
==6633== Copyright (C) 2000-2008, and GNU GPL'd, by Julian Seward et al.
==6633== For more details, rerun with: -v
==6633==
==6633==
==6633== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 23 from 2)
==6633== malloc/free: in use at exit: 61,376 bytes in 17 blocks.
==6633== malloc/free: 110 allocs, 93 frees, 122,903 bytes allocated.
==6633== For counts of detected errors, rerun with: -v
==6633== searching for pointers to 17 not-freed blocks.
==6633== checked 204,304 bytes.
==6633==
==6633== 24 bytes in 1 blocks are definitely lost in loss record 1 of 4
==6633== at 0x4C278AE: malloc (vg_replace_malloc.c:207)
==6633== by 0x65F2B51: ???
==6633== by 0x65F387A: ???
==6633== by 0x65F1049: ???
==6633== by 0x661810E: ???
==6633== by 0x639B3B9: ???
==6633== by 0x4E30AF4: dbi_conn_connect (in /usr/lib/libdbi.so.0.0.5)
==6633== by 0x400DDC: main (dbi_mysql.cpp:17)
==6633==
==6633==
==6633== 32 bytes in 1 blocks are still reachable in loss record 2 of 4
==6633== at 0x4C25684: calloc (vg_replace_malloc.c:397)
==6633== by 0x5D9433F: _dlerror_run (dlerror.c:142)
==6633== by 0x5D93EC0: dlopen@@GLIBC_2.2.5 (dlopen.c:88)
==6633== by 0x4E31C08: dbi_initialize (in /usr/lib/libdbi.so.0.0.5)
==6633== by 0x400D9F: main (dbi_mysql.cpp:13)
==6633==
==6633==
==6633== 61,320 (4,088 direct, 57,232 indirect) bytes in 1 blocks are
definitely lost in loss record 3 of 4
==6633== at 0x4C278AE: malloc (vg_replace_malloc.c:207)
==6633== by 0x65F9B85: ???
==6633== by 0x65FA26F: ???
==6633== by 0x65FAC64: ???
==6633== by 0x65FAE56: ???
==6633== by 0x6617ED9: ???
==6633== by 0x6619E57: ???
==6633== by 0x639B3EE: ???
==6633== by 0x4E30AF4: dbi_conn_connect (in /usr/lib/libdbi.so.0.0.5)
==6633== by 0x400DDC: main (dbi_mysql.cpp:17)
==6633==
==6633==
==6633== 57,232 bytes in 14 blocks are indirectly lost in loss record 4 of 4
==6633== at 0x4C278AE: malloc (vg_replace_malloc.c:207)
==6633== by 0x65F9B85: ???
==6633== by 0x65FA28B: ???
==6633== by 0x65FAC64: ???
==6633== by 0x65FAE56: ???
==6633== by 0x6617ED9: ???
==6633== by 0x6619E57: ???
==6633== by 0x639B3EE: ???
==6633== by 0x4E30AF4: dbi_conn_connect (in /usr/lib/libdbi.so.0.0.5)
==6633== by 0x400DDC: main (dbi_mysql.cpp:17)
==6633==
==6633== LEAK SUMMARY:
==6633== definitely lost: 4,112 bytes in 2 blocks.
==6633== indirectly lost: 57,232 bytes in 14 blocks.
==6633== possibly lost: 0 bytes in 0 blocks.
==6633== still reachable: 32 bytes in 1 blocks.
==6633== suppressed: 0 bytes in 0 blocks.
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