>Description:
dmalloc identifies memory leaks when using mysqlclient c library once a malloc and
associated free have been used. Although these memory leaks are not within the
mysqlclient library itself they are found in mainly nsswitch.c and elf libraries such
as dl-open.c and dl-version.c that are used by the myslclient library.
>How-To-Repeat:
Consider the code:
*********************************************CODE****************************************************
#include <stdlib.h>
#include <stdio.h>
#include <mysql/mysql.h>
#include "dmalloc.h"
int main()
{
MYSQL mysql;
char *test;
//test = malloc(sizeof(char) * 200);
mysql_init(&mysql);
mysql_real_connect(&mysql,"127.0.0.1","username","password","database",0,NULL,0);
mysql_close(&mysql);
//free(test);
printf("Finished!\n");
}
*********************************************END OF
CODE****************************************************
compiled using : "gcc mysql_mem.c -o mysql_mem -lmysqlclient -ldmalloc"
This produces no dmalloc log file *until* the malloc and free are uncommented. Then
the following dmalloc logfile is created:
*********************************************DMALLOC
LOG****************************************************
1034954529: 80: Dmalloc version '4.8.2' from 'http://dmalloc.com/'
1034954529: 80: flags = 0x4f47543, logfile 'test-log'
1034954529: 80: interval = 0, addr = 0, seen # = 0
1034954529: 80: starting time = 1034954528
1034954529: 80: free bucket count/bits: 109/5 34/6 31/7 15/8 8/9 3/10 1/11 1/14
1034954529: 80: basic-block 4096 bytes, alignment 8 bytes, heap grows up
1034954529: 80: heap: 0x808c000 to 0x809c000, size 65536 bytes (16 blocks)
1034954529: 80: heap checked 0
1034954529: 80: alloc calls: malloc 65, calloc 2, realloc 0, free 13
1034954529: 80: alloc calls: recalloc 0, memalign 0, valloc 0
1034954529: 80: total memory allocated: 17169 bytes (67 pnts)
1034954529: 80: max in use at one time: 16214 bytes (61 pnts)
1034954529: 80: max alloced with 1 call: 8192 bytes
1034954529: 80: max alloc rounding loss: 11466 bytes (41%)
1034954529: 80: max memory space wasted: 14510 bytes (34%)
1034954529: 80: final user memory space: basic 5, divided 7, 42190 bytes
1034954529: 80: final admin overhead: basic 1, divided 3, 16384 bytes (25%)
1034954529: 80: final external space: 0 bytes (0 blocks)
1034954529: 80: top 10 allocations:
1034954529: 80: total-size count in-use-size count source
1034954529: 80: 8540 5 64 1 ra=0x4002ee7a
1034954529: 80: 4088 1 4088 1 ra=0x40034a2b
1034954529: 80: 1024 1 1024 1 ra=0x40153408
1034954529: 80: 1008 26 1008 26 ra=0x4014e975
1034954529: 80: 728 2 0 0 ra=0x400c4571
1034954529: 80: 512 1 512 1 ra=0x4000abfd
1034954529: 80: 364 1 0 0 ra=0x400c6871
1034954529: 80: 242 15 242 15 ra=0x4014edfe
1034954529: 80: 200 1 0 0 mysql_mem.c:11
1034954529: 80: 17169 67 7214 54 Total of 20
1034954529: 80: dumping not-freed pointers changed since 0:
1034954529: 80: not freed: '0x808e208|s1' (128 bytes) from 'ra=0x4000ebba'
1034954529: 80: not freed: '0x808f008|s1' (1024 bytes) from 'ra=0x40153408'
1034954529: 80: not freed: '0x8092008|s1' (8 bytes) from 'ra=0x4014e805'
1034954529: 80: not freed: '0x8092028|s1' (15 bytes) from 'ra=0x4014edfe'
1034954529: 80: not freed: '0x8092048|s1' (15 bytes) from 'ra=0x4014edfe'
1034954529: 80: not freed: '0x8092068|s1' (14 bytes) from 'ra=0x4014edfe'
1034954529: 80: not freed: '0x8092088|s1' (14 bytes) from 'ra=0x4014edfe'
1034954529: 80: not freed: '0x80920a8|s1' (19 bytes) from 'ra=0x4014edfe'
1034954529: 80: not freed: '0x80920c8|s1' (15 bytes) from 'ra=0x4014edfe'
1034954529: 80: not freed: '0x80920e8|s1' (17 bytes) from 'ra=0x4014edfe'
1034954529: 80: not freed: '0x8092108|s1' (17 bytes) from 'ra=0x4014edfe'
1034954529: 80: not freed: '0x8092128|s1' (18 bytes) from 'ra=0x4014edfe'
1034954529: 80: not freed: '0x8092148|s1' (12 bytes) from 'ra=0x4014edfe'
1034954529: 80: not freed: '0x8092168|s1' (17 bytes) from 'ra=0x4014edfe'
1034954529: 80: not freed: '0x8092188|s1' (17 bytes) from 'ra=0x4014edfe'
1034954529: 80: not freed: '0x80921a8|s1' (18 bytes) from 'ra=0x4014edfe'
1034954529: 80: not freed: '0x80921c8|s1' (18 bytes) from 'ra=0x4014edfe'
1034954529: 80: not freed: '0x80921e8|s1' (16 bytes) from 'ra=0x4014edfe'
1034954529: 80: not freed: '0x8092208|s1' (16 bytes) from 'ra=0x4013e76d'
1034954529: 80: not freed: '0x8092228|s1' (8 bytes) from 'ra=0x4014e1fb'
1034954529: 80: not freed: '0x8092248|s1' (12 bytes) from 'ra=0x4014eef3'
1034954529: 80: not freed: '0x8094008|s1' (38 bytes) from 'ra=0x4014e975'
1034954529: 80: not freed: '0x8094048|s1' (40 bytes) from 'ra=0x4014e975'
1034954529: 80: not freed: '0x8094088|s1' (38 bytes) from 'ra=0x4014e975'
1034954529: 80: not freed: '0x80940c8|s1' (40 bytes) from 'ra=0x4014e975'
1034954529: 80: not freed: '0x8094108|s1' (38 bytes) from 'ra=0x4014e975'
1034954529: 80: not freed: '0x8094148|s1' (40 bytes) from 'ra=0x4014e975'
1034954529: 80: not freed: '0x8094188|s1' (38 bytes) from 'ra=0x4014e975'
1034954529: 80: not freed: '0x80941c8|s1' (40 bytes) from 'ra=0x4014e975'
1034954529: 80: not freed: '0x8094208|s1' (36 bytes) from 'ra=0x4014e975'
1034954529: 80: not freed: '0x8094248|s1' (40 bytes) from 'ra=0x4014e975'
1034954529: 80: not freed: '0x8094288|s1' (38 bytes) from 'ra=0x4014e975'
1034954529: 80: not freed: '0x80942c8|s1' (38 bytes) from 'ra=0x4014e975'
1034954529: 80: not freed: '0x8094308|s1' (38 bytes) from 'ra=0x4014e975'
1034954529: 80: not freed: '0x8094348|s1' (38 bytes) from 'ra=0x4014e975'
1034954529: 80: not freed: '0x8094388|s1' (38 bytes) from 'ra=0x4014e975'
1034954529: 80: not freed: '0x80943c8|s1' (40 bytes) from 'ra=0x4014e975'
1034954529: 80: not freed: '0x8094408|s1' (38 bytes) from 'ra=0x4014e975'
1034954529: 80: not freed: '0x8094448|s1' (38 bytes) from 'ra=0x4014e975'
1034954529: 80: not freed: '0x8094488|s1' (40 bytes) from 'ra=0x4014e975'
1034954529: 80: not freed: '0x80944c8|s1' (38 bytes) from 'ra=0x4014e975'
1034954529: 80: not freed: '0x8094508|s1' (40 bytes) from 'ra=0x4014e975'
1034954529: 80: not freed: '0x8094548|s1' (40 bytes) from 'ra=0x4014e975'
1034954529: 80: not freed: '0x8094588|s1' (38 bytes) from 'ra=0x4014e975'
1034954529: 80: not freed: '0x80945c8|s1' (40 bytes) from 'ra=0x4014e975'
1034954529: 80: not freed: '0x8094608|s1' (38 bytes) from 'ra=0x4014e975'
1034954529: 80: not freed: '0x8094648|s1' (40 bytes) from 'ra=0x4014e975'
1034954529: 80: not freed: '0x8094688|s1' (23 bytes) from 'ra=0x40007f98'
1034954529: 80: not freed: '0x80946c8|s1' (30 bytes) from 'ra=0x4000ac0e'
1034954529: 80: not freed: '0x8094708|s1' (23 bytes) from 'ra=0x4000ae6c'
1034954529: 80: not freed: '0x8094748|s1' (28 bytes) from 'ra=0x4000c78e'
1034954529: 80: not freed: '0x8095008|s1' (512 bytes) from 'ra=0x4000abfd'
1034954529: 80: not freed: '0x8096088|s1' (64 bytes) from 'ra=0x4002ee7a'
1034954529: 80: not freed: '0x809a008|s1' (4088 bytes) from 'ra=0x40034a2b'
1034954529: 80: total-size count source
1034954529: 80: 4088 1 ra=0x40034a2b
1034954529: 80: 1024 1 ra=0x40153408
1034954529: 80: 1008 26 ra=0x4014e975
1034954529: 80: 512 1 ra=0x4000abfd
1034954529: 80: 242 15 ra=0x4014edfe
1034954529: 80: 128 1 ra=0x4000ebba
1034954529: 80: 64 1 ra=0x4002ee7a
1034954529: 80: 30 1 ra=0x4000ac0e
1034954529: 80: 28 1 ra=0x4000c78e
1034954529: 80: 23 1 ra=0x40007f98
1034954529: 80: 23 1 ra=0x4000ae6c
1034954529: 80: 16 1 ra=0x4013e76d
1034954529: 80: 12 1 ra=0x4014eef3
1034954529: 80: 8 1 ra=0x4014e1fb
1034954529: 80: 8 1 ra=0x4014e805
1034954529: 80: 7214 54 Total of 15
1034954529: 80: unknown memory: 54 pointers, 7214 bytes
1034954529: 80: ending time = 1034954529, elapsed since start = 0:00:01
1034954529: 81: WARNING: tried to free(0) from 'ra=0x4019d9ae'
1034954529: 81: free: invalid pointer: from 'ra=0x4019d9ae'
1034954529: 81: ERROR: _chunk_free: pointer is null (err 20)
*********************************************END OF DMALLOC
LOG****************************************************
Using gdb the memory address are resolved to the following:
*********************************************GDB ADDRESS
RESOLUTION****************************************************
(gdb) info line *0x4019d9ae
Line 264 of "md5-crypt.c" starts at address 0x4019d9ae <free_mem+30> and ends at
0x4019d9b8 <free_mem+40>.
(gdb) info line *0x40034a2b
No line number information available for address 0x40034a2b <my_once_alloc+107>
(gdb) info line *0x40153408
Line 109 of "../nss/getXXbyYY.c" starts at address 0x401533fe <getservbyname+314> and
ends at 0x4015340e <getservbyname+330>.
(gdb) info line *0x4014e975
Line 514 of "nsswitch.c" starts at address 0x4014e962 <nss_parse_service_list+114>
and ends at 0x4014e978 <nss_parse_service_list+136>.
(gdb) info line *0x4000abfd
Line 40 of "dl-object.c" starts at address 0x4000abf8 <_dl_new_object+52> and ends at
0x4000ac00 <_dl_new_object+60>.
(gdb) info line *0x4014edfe
Line 656 of "nsswitch.c" starts at address 0x4014edf3 <nss_getline+131> and ends at
0x4014ee01 <nss_getline+145>.
(gdb)
*********************************************END OF GDB
STUFF****************************************************
>Fix:
>Submitter-Id: <submitter ID>
>Originator: Chris Masters
>Organization:
>MySQL support: none
>Synopsis: mysqlclient c library memeory leak detected using dmalloc
>Severity: non-critical
>Priority:
>Category: mysql
>Class: sw-bug
>Release: mysql-3.23.52 (Official MySQL RPM)
>Server: /usr/bin/mysqladmin Ver 8.23 Distrib 3.23.52, for pc-linux-gnu on i686
Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
This software comes with ABSOLUTELY NO WARRANTY. This is free software,
and you are welcome to modify and redistribute it under the GPL license
Server version 3.23.52
Protocol version 10
Connection Localhost via UNIX socket
UNIX socket /var/lib/mysql/mysql.sock
Uptime: 4 days 21 hours 18 min 59 sec
Threads: 24 Questions: 1290615 Slow queries: 0 Opens: 75 Flush tables: 1 Open
tables: 25 Queries per second avg: 3.056
>Environment:
System: Linux 2.4.7-10 #1 Thu Sep 6 17:27:27 EDT 2001 i686 unknown
Architecture: i686
Some paths: /usr/bin/perl /usr/bin/make /usr/bin/gmake /usr/bin/gcc /usr/bin/cc
GCC: Reading specs from /usr/lib/gcc-lib/i386-redhat-linux/2.96/specs
gcc version 2.96 20000731 (Red Hat Linux 7.1 2.96-98)
Compilation info: CC='gcc' CFLAGS='-O6 -fno-omit-frame-pointer -mpentium' CXX='gcc'
CXXFLAGS='-O6 -fno-omit-frame-pointer -felide-constructors
-fno-exceptions -fno-rtti -mpentium' LDFLAGS=''
LIBC:
lrwxrwxrwx 1 root root 13 Jul 31 11:24 /lib/libc.so.6 -> libc-2.2.4.so
-rwxr-xr-x 1 root root 1282588 Sep 4 2001 /lib/libc-2.2.4.so
-rw-r--r-- 1 root root 27304836 Sep 4 2001 /usr/lib/libc.a
-rw-r--r-- 1 root root 178 Sep 4 2001 /usr/lib/libc.so
Configure command: ./configure --disable-shared --with-mysqld-ldflags=-all-static
--with-client-ldflags=-all-static --with-other-libc=/usr/local/mysql-glibc
--without-berkeley-db --without-innodb --enable-assembler --enable-local-infile
--with-mysqld-user=mysql --with-unix-socket-path=/var/lib/mysql/mysql.sock --prefix=/
--with-extra-charsets=complex --exec-prefix=/usr --libexecdir=/usr/sbin
--sysconfdir=/etc --datadir=/usr/share --localstatedir=/var/lib/mysql
--infodir=/usr/share/info --includedir=/usr/include --mandir=/usr/share/man
'--with-comment=Official MySQL RPM' CC=gcc 'CFLAGS=-O6 -fno-omit-frame-pointer
-mpentium' 'CXXFLAGS=-O6 -fno-omit-frame-pointer -felide-constructors
-fno-exceptions -fno-rtti -mpentium' CXX=gcc
---------------------------------------------------------------------
Before posting, please check:
http://www.mysql.com/manual.php (the manual)
http://lists.mysql.com/ (the list archive)
To request this thread, e-mail <[EMAIL PROTECTED]>
To unsubscribe, e-mail <[EMAIL PROTECTED]>
Trouble unsubscribing? Try: http://lists.mysql.com/php/unsubscribe.php
