Description:
possible memory leak with libmysqlclient.so as per the valgrind report.
==958== by 0x108769: main (mysql_dlopen.c:11)
==958==
==958== LEAK SUMMARY:
==958== definitely lost: 0 bytes in 0 blocks
==958== indirectly lost: 0 bytes in 0 blocks
==958== possibly lost: 0 bytes in 0 blocks
==958== still reachable: 86,098 bytes in 27 blocks
==958== suppressed: 0 bytes in 0 blocks
==958==
==958== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)
==958== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)
It has ==958== still reachable: 86,098 bytes in 27 blocks
"Reachable block" memory that was not freed, but a pointer to it still exists at the program's exit time.
How to repeat:
********************
mysql_dlopen.c
********************
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <dlfcn.h>
void *mysql_handle;
int main()
{
mysql_handle = NULL;
mysql_handle = dlopen("/home/lalit/mysql_tar/mysql/5.7.29/lib/libmysqlclient.so", RTLD_NOW | RTLD_DEEPBIND);
if (!mysql_handle)
{
printf("Failed to open handle :%s\n", dlerror());
}
if (mysql_handle != NULL)
{
dlclose(mysql_handle);
mysql_handle = NULL;
}
return 0;
}
********
mysql/5.7.29/lib$ g++ mysql_dlopen.c -Wall -ggdb3 -ldl -o mysql_dlopen
$ valgrind --leak-check=full --show-leak-kinds=all --track-origins=yes --verbose ./mysql_dlopen
==958== Memcheck, a memory error detector
==958== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
==958== Using Valgrind-3.13.0 and LibVEX; rerun with -h for copyright info
==958== Command: ./mysql_dlopen
==958==
--958-- Valgrind options:
--958-- --leak-check=full
--958-- --show-leak-kinds=all
--958-- --track-origins=yes
--958-- --verbose
--958-- Contents of /proc/version:
--958-- Linux version 4.15.0-76-generic (buildd@lcy01-amd64-029) (gcc version 7.4.0 (Ubuntu 7.4.0-1ubuntu1~18.04.1)) #86-Ubuntu SMP Fri Jan 17 17:24:28 UTC 2020
--958--
--958-- Arch and hwcaps: AMD64, LittleEndian, amd64-cx16-lzcnt-rdtscp-sse3-avx-avx2-bmi
--958-- Page sizes: currently 4096, max supported 4096
--958-- Valgrind library directory: /usr/lib/valgrind
--958-- Reading syms from /home/lalit/mysql_tar/mysql/5.7.29/lib/mysql_dlopen
--958-- Reading syms from /lib/x86_64-linux-gnu/ld-2.27.so
--958-- Considering /lib/x86_64-linux-gnu/ld-2.27.so ..
--958-- .. CRC mismatch (computed 1b7c895e wanted 2943108a)
--958-- Considering /usr/lib/debug/lib/x86_64-linux-gnu/ld-2.27.so ..
--958-- .. CRC is valid
--958-- Reading syms from /usr/lib/valgrind/memcheck-amd64-linux
--958-- Considering /usr/lib/valgrind/memcheck-amd64-linux ..
--958-- .. CRC mismatch (computed c25f395c wanted 0a9602a8)
--958-- object doesn't have a symbol table
--958-- object doesn't have a dynamic symbol table
--958-- Scheduler: using generic scheduler lock implementation.
--958-- Reading suppressions file: /usr/lib/valgrind/default.supp
==958== embedded gdbserver: reading from /tmp/vgdb-pipe-from-vgdb-to-958-by-lalit-on-???
==958== embedded gdbserver: writing to /tmp/vgdb-pipe-to-vgdb-from-958-by-lalit-on-???
==958== embedded gdbserver: shared mem /tmp/vgdb-pipe-shared-mem-vgdb-958-by-lalit-on-???
==958==
==958== TO CONTROL THIS PROCESS USING vgdb (which you probably
==958== don't want to do, unless you know exactly what you're doing,
==958== or are doing some strange experiment):
==958== /usr/lib/valgrind/../../bin/vgdb --pid=958 ...command...
==958==
==958== TO DEBUG THIS PROCESS USING GDB: start GDB like this
==958== /path/to/gdb ./mysql_dlopen
==958== and then give GDB the following command
==958== target remote | /usr/lib/valgrind/../../bin/vgdb --pid=958
==958== --pid is optional if only one valgrind process is running
==958==
--958-- REDIR: 0x401f2f0 (ld-linux-x86-64.so.2:strlen) redirected to 0x58060901 (???)
--958-- REDIR: 0x401f0d0 (ld-linux-x86-64.so.2:index) redirected to 0x5806091b (???)
--958-- Reading syms from /usr/lib/valgrind/vgpreload_core-amd64-linux.so
--958-- Considering /usr/lib/valgrind/vgpreload_core-amd64-linux.so ..
--958-- .. CRC mismatch (computed 4b63d83e wanted 670599e6)
--958-- object doesn't have a symbol table
--958-- Reading syms from /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so
--958-- Considering /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so ..
--958-- .. CRC mismatch (computed a4b37bee wanted 8ad4dc94)
--958-- object doesn't have a symbol table
==958== WARNING: new redirection conflicts with existing -- ignoring it
--958-- old: 0x0401f2f0 (strlen ) R-> (0000.0) 0x58060901 ???
--958-- new: 0x0401f2f0 (strlen ) R-> (2007.0) 0x04c32db0 strlen
--958-- REDIR: 0x401d360 (ld-linux-x86-64.so.2:strcmp) redirected to 0x4c33ee0 (strcmp)
--958-- REDIR: 0x401f830 (ld-linux-x86-64.so.2:mempcpy) redirected to 0x4c374f0 (mempcpy)
--958-- Reading syms from /lib/x86_64-linux-gnu/libdl-2.27.so
--958-- Considering /lib/x86_64-linux-gnu/libdl-2.27.so ..
--958-- .. CRC mismatch (computed bd82fa02 wanted d1fdccc9)
--958-- Considering /usr/lib/debug/lib/x86_64-linux-gnu/libdl-2.27.so ..
--958-- .. CRC is valid
--958-- Reading syms from /lib/x86_64-linux-gnu/libc-2.27.so
--958-- Considering /lib/x86_64-linux-gnu/libc-2.27.so ..
--958-- .. CRC mismatch (computed b1c74187 wanted 042cc048)
--958-- Considering /usr/lib/debug/lib/x86_64-linux-gnu/libc-2.27.so ..
--958-- .. CRC is valid
--958-- REDIR: 0x50dec70 (libc.so.6:memmove) redirected to 0x4a2a6e0 (_vgnU_ifunc_wrapper)
--958-- REDIR: 0x50ddd40 (libc.so.6:strncpy) redirected to 0x4a2a6e0 (_vgnU_ifunc_wrapper)
--958-- REDIR: 0x50def50 (libc.so.6:strcasecmp) redirected to 0x4a2a6e0 (_vgnU_ifunc_wrapper)
--958-- REDIR: 0x50dd790 (libc.so.6:strcat) redirected to 0x4a2a6e0 (_vgnU_ifunc_wrapper)
--958-- REDIR: 0x50ddd70 (libc.so.6:rindex) redirected to 0x4a2a6e0 (_vgnU_ifunc_wrapper)
--958-- REDIR: 0x50e07c0 (libc.so.6:rawmemchr) redirected to 0x4a2a6e0 (_vgnU_ifunc_wrapper)
--958-- REDIR: 0x50dede0 (libc.so.6:mempcpy) redirected to 0x4a2a6e0 (_vgnU_ifunc_wrapper)
--958-- REDIR: 0x50dec10 (libc.so.6:bcmp) redirected to 0x4a2a6e0 (_vgnU_ifunc_wrapper)
--958-- REDIR: 0x50ddd00 (libc.so.6:strncmp) redirected to 0x4a2a6e0 (_vgnU_ifunc_wrapper)
--958-- REDIR: 0x50dd800 (libc.so.6:strcmp) redirected to 0x4a2a6e0 (_vgnU_ifunc_wrapper)
--958-- REDIR: 0x50ded40 (libc.so.6:memset) redirected to 0x4a2a6e0 (_vgnU_ifunc_wrapper)
--958-- REDIR: 0x50fc0f0 (libc.so.6:wcschr) redirected to 0x4a2a6e0 (_vgnU_ifunc_wrapper)
--958-- REDIR: 0x50ddca0 (libc.so.6:strnlen) redirected to 0x4a2a6e0 (_vgnU_ifunc_wrapper)
--958-- REDIR: 0x50dd870 (libc.so.6:strcspn) redirected to 0x4a2a6e0 (_vgnU_ifunc_wrapper)
--958-- REDIR: 0x50defa0 (libc.so.6:strncasecmp) redirected to 0x4a2a6e0 (_vgnU_ifunc_wrapper)
--958-- REDIR: 0x50dd840 (libc.so.6:strcpy) redirected to 0x4a2a6e0 (_vgnU_ifunc_wrapper)
--958-- REDIR: 0x50df0e0 (libc.so.6:memcpy@@GLIBC_2.14) redirected to 0x4a2a6e0 (_vgnU_ifunc_wrapper)
--958-- REDIR: 0x50ddda0 (libc.so.6:strpbrk) redirected to 0x4a2a6e0 (_vgnU_ifunc_wrapper)
--958-- REDIR: 0x50dd7c0 (libc.so.6:index) redirected to 0x4a2a6e0 (_vgnU_ifunc_wrapper)
--958-- REDIR: 0x50ddc70 (libc.so.6:strlen) redirected to 0x4a2a6e0 (_vgnU_ifunc_wrapper)
--958-- REDIR: 0x50e86c0 (libc.so.6:memrchr) redirected to 0x4a2a6e0 (_vgnU_ifunc_wrapper)
--958-- REDIR: 0x50deff0 (libc.so.6:strcasecmp_l) redirected to 0x4a2a6e0 (_vgnU_ifunc_wrapper)
--958-- REDIR: 0x50debe0 (libc.so.6:memchr) redirected to 0x4a2a6e0 (_vgnU_ifunc_wrapper)
--958-- REDIR: 0x50fceb0 (libc.so.6:wcslen) redirected to 0x4a2a6e0 (_vgnU_ifunc_wrapper)
--958-- REDIR: 0x50de050 (libc.so.6:strspn) redirected to 0x4a2a6e0 (_vgnU_ifunc_wrapper)
--958-- REDIR: 0x50def20 (libc.so.6:stpncpy) redirected to 0x4a2a6e0 (_vgnU_ifunc_wrapper)
--958-- REDIR: 0x50deef0 (libc.so.6:stpcpy) redirected to 0x4a2a6e0 (_vgnU_ifunc_wrapper)
--958-- REDIR: 0x50e07f0 (libc.so.6:strchrnul) redirected to 0x4a2a6e0 (_vgnU_ifunc_wrapper)
--958-- REDIR: 0x50df040 (libc.so.6:strncasecmp_l) redirected to 0x4a2a6e0 (_vgnU_ifunc_wrapper)
--958-- REDIR: 0x51ce3c0 (libc.so.6:__strrchr_avx2) redirected to 0x4c32730 (rindex)
--958-- REDIR: 0x50d7070 (libc.so.6:malloc) redirected to 0x4c2faa0 (malloc)
--958-- REDIR: 0x50da030 (libc.so.6:calloc) redirected to 0x4c31a70 (calloc)
--958-- Reading syms from /home/lalit/mysql_tar/mysql/5.7.29/lib/libmysqlclient.so.20.3.16
--958-- Reading syms from /lib/x86_64-linux-gnu/libpthread-2.27.so
--958-- Considering /usr/lib/debug/.build-id/28/c6aade70b2d40d1f0f3d0a1a0cad1ab816448f.debug ..
--958-- .. build-id is valid
--958-- Reading syms from /lib/x86_64-linux-gnu/librt-2.27.so
--958-- Considering /lib/x86_64-linux-gnu/librt-2.27.so ..
--958-- .. CRC mismatch (computed 16979484 wanted f9e041e3)
--958-- Considering /usr/lib/debug/lib/x86_64-linux-gnu/librt-2.27.so ..
--958-- .. CRC is valid
--958-- Reading syms from /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.25
--958-- object doesn't have a symbol table
--958-- Reading syms from /lib/x86_64-linux-gnu/libm-2.27.so
--958-- Considering /lib/x86_64-linux-gnu/libm-2.27.so ..
--958-- .. CRC mismatch (computed 7feae033 wanted b29b2508)
--958-- Considering /usr/lib/debug/lib/x86_64-linux-gnu/libm-2.27.so ..
--958-- .. CRC is valid
--958-- Reading syms from /lib/x86_64-linux-gnu/libgcc_s.so.1
--958-- object doesn't have a symbol table
--958-- REDIR: 0x50d7950 (libc.so.6:free) redirected to 0x4c30cd0 (free)
--958-- REDIR: 0x50deb20 (libc.so.6:strstr) redirected to 0x4a2a6e0 (_vgnU_ifunc_wrapper)
--958-- REDIR: 0x50ddcd0 (libc.so.6:strncat) redirected to 0x4a2a6e0 (_vgnU_ifunc_wrapper)
--958-- Discarding syms at 0x5895ad0-0x5a64628 in /home/lalit/mysql_tar/mysql/5.7.29/lib/libmysqlclient.so.20.3.16 due to munmap()
==958==
==958== HEAP SUMMARY:
==958== in use at exit: 86,098 bytes in 27 blocks
==958== total heap usage: 39 allocs, 12 frees, 91,189 bytes allocated
==958==
==958== Searching for pointers to 27 not-freed blocks
==958== Checked 145,304 bytes
==958==
==958== 160 bytes in 5 blocks are still reachable in loss record 1 of 7
==958== at 0x4C2FB0F: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==958== by 0x4016027: _dl_close_worker.part.0 (dl-close.c:395)
==958== by 0x4016AA9: _dl_close_worker (dl-close.c:125)
==958== by 0x4016AA9: _dl_close (dl-close.c:842)
==958== by 0x51A72DE: _dl_catch_exception (dl-error-skeleton.c:196)
==958== by 0x51A736E: _dl_catch_error (dl-error-skeleton.c:215)
==958== by 0x4E3D734: _dlerror_run (dlerror.c:162)
==958== by 0x4E3D0B2: dlclose (dlclose.c:46)
==958== by 0x1087B0: main (mysql_dlopen.c:20)
==958==
==958== 180 bytes in 5 blocks are still reachable in loss record 2 of 7
==958== at 0x4C2FB0F: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==958== by 0x401D329: strdup (strdup.c:42)
==958== by 0x4018656: _dl_load_cache_lookup (dl-cache.c:315)
==958== by 0x4009382: _dl_map_object (dl-load.c:2255)
==958== by 0x400E311: openaux (dl-deps.c:63)
==958== by 0x51A72DE: _dl_catch_exception (dl-error-skeleton.c:196)
==958== by 0x400E617: _dl_map_object_deps (dl-deps.c:249)
==958== by 0x4014F48: dl_open_worker (dl-open.c:278)
==958== by 0x51A72DE: _dl_catch_exception (dl-error-skeleton.c:196)
==958== by 0x40147C9: _dl_open (dl-open.c:605)
==958== by 0x4E3CF95: dlopen_doit (dlopen.c:66)
==958== by 0x51A72DE: _dl_catch_exception (dl-error-skeleton.c:196)
==958==
==958== 180 bytes in 5 blocks are still reachable in loss record 3 of 7
==958== at 0x4C2FB0F: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==958== by 0x400C3E7: _dl_new_object (dl-object.c:163)
==958== by 0x40069A4: _dl_map_object_from_fd (dl-load.c:943)
==958== by 0x4008FFB: _dl_map_object (dl-load.c:2389)
==958== by 0x400E311: openaux (dl-deps.c:63)
==958== by 0x51A72DE: _dl_catch_exception (dl-error-skeleton.c:196)
==958== by 0x400E617: _dl_map_object_deps (dl-deps.c:249)
==958== by 0x4014F48: dl_open_worker (dl-open.c:278)
==958== by 0x51A72DE: _dl_catch_exception (dl-error-skeleton.c:196)
==958== by 0x40147C9: _dl_open (dl-open.c:605)
==958== by 0x4E3CF95: dlopen_doit (dlopen.c:66)
==958== by 0x51A72DE: _dl_catch_exception (dl-error-skeleton.c:196)
==958==
==958== 2,904 bytes in 5 blocks are still reachable in loss record 4 of 7
==958== at 0x4C31B25: calloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==958== by 0x4011E85: _dl_check_map_versions (dl-version.c:274)
==958== by 0x401524B: dl_open_worker (dl-open.c:284)
==958== by 0x51A72DE: _dl_catch_exception (dl-error-skeleton.c:196)
==958== by 0x40147C9: _dl_open (dl-open.c:605)
==958== by 0x4E3CF95: dlopen_doit (dlopen.c:66)
==958== by 0x51A72DE: _dl_catch_exception (dl-error-skeleton.c:196)
==958== by 0x51A736E: _dl_catch_error (dl-error-skeleton.c:215)
==958== by 0x4E3D734: _dlerror_run (dlerror.c:162)
==958== by 0x4E3D050: dlopen@@GLIBC_2.2.5 (dlopen.c:87)
==958== by 0x108769: main (mysql_dlopen.c:11)
==958==
==958== 4,064 bytes in 1 blocks are still reachable in loss record 5 of 7
==958== at 0x4C31B25: calloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==958== by 0x400ACF9: do_lookup_unique (dl-lookup.c:251)
==958== by 0x400ACF9: do_lookup_x (dl-lookup.c:527)
==958== by 0x400B1EE: _dl_lookup_symbol_x (dl-lookup.c:813)
==958== by 0x400CAF8: elf_machine_rela (dl-machine.h:308)
==958== by 0x400CAF8: elf_dynamic_do_Rela (do-rel.h:137)
==958== by 0x400CAF8: _dl_relocate_object (dl-reloc.c:258)
==958== by 0x40150BC: dl_open_worker (dl-open.c:382)
==958== by 0x51A72DE: _dl_catch_exception (dl-error-skeleton.c:196)
==958== by 0x40147C9: _dl_open (dl-open.c:605)
==958== by 0x4E3CF95: dlopen_doit (dlopen.c:66)
==958== by 0x51A72DE: _dl_catch_exception (dl-error-skeleton.c:196)
==958== by 0x51A736E: _dl_catch_error (dl-error-skeleton.c:215)
==958== by 0x4E3D734: _dlerror_run (dlerror.c:162)
==958== by 0x4E3D050: dlopen@@GLIBC_2.2.5 (dlopen.c:87)
==958==
==958== 5,906 bytes in 5 blocks are still reachable in loss record 6 of 7
==958== at 0x4C31B25: calloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==958== by 0x400C100: _dl_new_object (dl-object.c:73)
==958== by 0x40069A4: _dl_map_object_from_fd (dl-load.c:943)
==958== by 0x4008FFB: _dl_map_object (dl-load.c:2389)
==958== by 0x400E311: openaux (dl-deps.c:63)
==958== by 0x51A72DE: _dl_catch_exception (dl-error-skeleton.c:196)
==958== by 0x400E617: _dl_map_object_deps (dl-deps.c:249)
==958== by 0x4014F48: dl_open_worker (dl-open.c:278)
==958== by 0x51A72DE: _dl_catch_exception (dl-error-skeleton.c:196)
==958== by 0x40147C9: _dl_open (dl-open.c:605)
==958== by 0x4E3CF95: dlopen_doit (dlopen.c:66)
==958== by 0x51A72DE: _dl_catch_exception (dl-error-skeleton.c:196)
==958==
==958== 72,704 bytes in 1 blocks are still reachable in loss record 7 of 7
==958== at 0x4C2FB0F: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==958== by 0x6529415: ??? (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.25)
==958== by 0x4010732: call_init (dl-init.c:72)
==958== by 0x4010732: _dl_init (dl-init.c:119)
==958== by 0x40151FE: dl_open_worker (dl-open.c:522)
==958== by 0x51A72DE: _dl_catch_exception (dl-error-skeleton.c:196)
==958== by 0x40147C9: _dl_open (dl-open.c:605)
==958== by 0x4E3CF95: dlopen_doit (dlopen.c:66)
==958== by 0x51A72DE: _dl_catch_exception (dl-error-skeleton.c:196)
==958== by 0x51A736E: _dl_catch_error (dl-error-skeleton.c:215)
==958== by 0x4E3D734: _dlerror_run (dlerror.c:162)
==958== by 0x4E3D050: dlopen@@GLIBC_2.2.5 (dlopen.c:87)
==958== by 0x108769: main (mysql_dlopen.c:11)
==958==
==958== LEAK SUMMARY:
==958== definitely lost: 0 bytes in 0 blocks
==958== indirectly lost: 0 bytes in 0 blocks
==958== possibly lost: 0 bytes in 0 blocks
==958== still reachable: 86,098 bytes in 27 blocks
==958== suppressed: 0 bytes in 0 blocks
==958==
==958== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)
==958== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)
Suggested fix:
still reachable blocks should be 0
Description: possible memory leak with libmysqlclient.so as per the valgrind report. ==958== by 0x108769: main (mysql_dlopen.c:11) ==958== ==958== LEAK SUMMARY: ==958== definitely lost: 0 bytes in 0 blocks ==958== indirectly lost: 0 bytes in 0 blocks ==958== possibly lost: 0 bytes in 0 blocks ==958== still reachable: 86,098 bytes in 27 blocks ==958== suppressed: 0 bytes in 0 blocks ==958== ==958== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0) ==958== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0) It has ==958== still reachable: 86,098 bytes in 27 blocks "Reachable block" memory that was not freed, but a pointer to it still exists at the program's exit time. How to repeat: ******************** mysql_dlopen.c ******************** #include <stdio.h> #include <string.h> #include <stdlib.h> #include <dlfcn.h> void *mysql_handle; int main() { mysql_handle = NULL; mysql_handle = dlopen("/home/lalit/mysql_tar/mysql/5.7.29/lib/libmysqlclient.so", RTLD_NOW | RTLD_DEEPBIND); if (!mysql_handle) { printf("Failed to open handle :%s\n", dlerror()); } if (mysql_handle != NULL) { dlclose(mysql_handle); mysql_handle = NULL; } return 0; } ******** mysql/5.7.29/lib$ g++ mysql_dlopen.c -Wall -ggdb3 -ldl -o mysql_dlopen $ valgrind --leak-check=full --show-leak-kinds=all --track-origins=yes --verbose ./mysql_dlopen ==958== Memcheck, a memory error detector ==958== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al. ==958== Using Valgrind-3.13.0 and LibVEX; rerun with -h for copyright info ==958== Command: ./mysql_dlopen ==958== --958-- Valgrind options: --958-- --leak-check=full --958-- --show-leak-kinds=all --958-- --track-origins=yes --958-- --verbose --958-- Contents of /proc/version: --958-- Linux version 4.15.0-76-generic (buildd@lcy01-amd64-029) (gcc version 7.4.0 (Ubuntu 7.4.0-1ubuntu1~18.04.1)) #86-Ubuntu SMP Fri Jan 17 17:24:28 UTC 2020 --958-- --958-- Arch and hwcaps: AMD64, LittleEndian, amd64-cx16-lzcnt-rdtscp-sse3-avx-avx2-bmi --958-- Page sizes: currently 4096, max supported 4096 --958-- Valgrind library directory: /usr/lib/valgrind --958-- Reading syms from /home/lalit/mysql_tar/mysql/5.7.29/lib/mysql_dlopen --958-- Reading syms from /lib/x86_64-linux-gnu/ld-2.27.so --958-- Considering /lib/x86_64-linux-gnu/ld-2.27.so .. --958-- .. CRC mismatch (computed 1b7c895e wanted 2943108a) --958-- Considering /usr/lib/debug/lib/x86_64-linux-gnu/ld-2.27.so .. --958-- .. CRC is valid --958-- Reading syms from /usr/lib/valgrind/memcheck-amd64-linux --958-- Considering /usr/lib/valgrind/memcheck-amd64-linux .. --958-- .. CRC mismatch (computed c25f395c wanted 0a9602a8) --958-- object doesn't have a symbol table --958-- object doesn't have a dynamic symbol table --958-- Scheduler: using generic scheduler lock implementation. --958-- Reading suppressions file: /usr/lib/valgrind/default.supp ==958== embedded gdbserver: reading from /tmp/vgdb-pipe-from-vgdb-to-958-by-lalit-on-??? ==958== embedded gdbserver: writing to /tmp/vgdb-pipe-to-vgdb-from-958-by-lalit-on-??? ==958== embedded gdbserver: shared mem /tmp/vgdb-pipe-shared-mem-vgdb-958-by-lalit-on-??? ==958== ==958== TO CONTROL THIS PROCESS USING vgdb (which you probably ==958== don't want to do, unless you know exactly what you're doing, ==958== or are doing some strange experiment): ==958== /usr/lib/valgrind/../../bin/vgdb --pid=958 ...command... ==958== ==958== TO DEBUG THIS PROCESS USING GDB: start GDB like this ==958== /path/to/gdb ./mysql_dlopen ==958== and then give GDB the following command ==958== target remote | /usr/lib/valgrind/../../bin/vgdb --pid=958 ==958== --pid is optional if only one valgrind process is running ==958== --958-- REDIR: 0x401f2f0 (ld-linux-x86-64.so.2:strlen) redirected to 0x58060901 (???) --958-- REDIR: 0x401f0d0 (ld-linux-x86-64.so.2:index) redirected to 0x5806091b (???) --958-- Reading syms from /usr/lib/valgrind/vgpreload_core-amd64-linux.so --958-- Considering /usr/lib/valgrind/vgpreload_core-amd64-linux.so .. --958-- .. CRC mismatch (computed 4b63d83e wanted 670599e6) --958-- object doesn't have a symbol table --958-- Reading syms from /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so --958-- Considering /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so .. --958-- .. CRC mismatch (computed a4b37bee wanted 8ad4dc94) --958-- object doesn't have a symbol table ==958== WARNING: new redirection conflicts with existing -- ignoring it --958-- old: 0x0401f2f0 (strlen ) R-> (0000.0) 0x58060901 ??? --958-- new: 0x0401f2f0 (strlen ) R-> (2007.0) 0x04c32db0 strlen --958-- REDIR: 0x401d360 (ld-linux-x86-64.so.2:strcmp) redirected to 0x4c33ee0 (strcmp) --958-- REDIR: 0x401f830 (ld-linux-x86-64.so.2:mempcpy) redirected to 0x4c374f0 (mempcpy) --958-- Reading syms from /lib/x86_64-linux-gnu/libdl-2.27.so --958-- Considering /lib/x86_64-linux-gnu/libdl-2.27.so .. --958-- .. CRC mismatch (computed bd82fa02 wanted d1fdccc9) --958-- Considering /usr/lib/debug/lib/x86_64-linux-gnu/libdl-2.27.so .. --958-- .. CRC is valid --958-- Reading syms from /lib/x86_64-linux-gnu/libc-2.27.so --958-- Considering /lib/x86_64-linux-gnu/libc-2.27.so .. --958-- .. CRC mismatch (computed b1c74187 wanted 042cc048) --958-- Considering /usr/lib/debug/lib/x86_64-linux-gnu/libc-2.27.so .. --958-- .. CRC is valid --958-- REDIR: 0x50dec70 (libc.so.6:memmove) redirected to 0x4a2a6e0 (_vgnU_ifunc_wrapper) --958-- REDIR: 0x50ddd40 (libc.so.6:strncpy) redirected to 0x4a2a6e0 (_vgnU_ifunc_wrapper) --958-- REDIR: 0x50def50 (libc.so.6:strcasecmp) redirected to 0x4a2a6e0 (_vgnU_ifunc_wrapper) --958-- REDIR: 0x50dd790 (libc.so.6:strcat) redirected to 0x4a2a6e0 (_vgnU_ifunc_wrapper) --958-- REDIR: 0x50ddd70 (libc.so.6:rindex) redirected to 0x4a2a6e0 (_vgnU_ifunc_wrapper) --958-- REDIR: 0x50e07c0 (libc.so.6:rawmemchr) redirected to 0x4a2a6e0 (_vgnU_ifunc_wrapper) --958-- REDIR: 0x50dede0 (libc.so.6:mempcpy) redirected to 0x4a2a6e0 (_vgnU_ifunc_wrapper) --958-- REDIR: 0x50dec10 (libc.so.6:bcmp) redirected to 0x4a2a6e0 (_vgnU_ifunc_wrapper) --958-- REDIR: 0x50ddd00 (libc.so.6:strncmp) redirected to 0x4a2a6e0 (_vgnU_ifunc_wrapper) --958-- REDIR: 0x50dd800 (libc.so.6:strcmp) redirected to 0x4a2a6e0 (_vgnU_ifunc_wrapper) --958-- REDIR: 0x50ded40 (libc.so.6:memset) redirected to 0x4a2a6e0 (_vgnU_ifunc_wrapper) --958-- REDIR: 0x50fc0f0 (libc.so.6:wcschr) redirected to 0x4a2a6e0 (_vgnU_ifunc_wrapper) --958-- REDIR: 0x50ddca0 (libc.so.6:strnlen) redirected to 0x4a2a6e0 (_vgnU_ifunc_wrapper) --958-- REDIR: 0x50dd870 (libc.so.6:strcspn) redirected to 0x4a2a6e0 (_vgnU_ifunc_wrapper) --958-- REDIR: 0x50defa0 (libc.so.6:strncasecmp) redirected to 0x4a2a6e0 (_vgnU_ifunc_wrapper) --958-- REDIR: 0x50dd840 (libc.so.6:strcpy) redirected to 0x4a2a6e0 (_vgnU_ifunc_wrapper) --958-- REDIR: 0x50df0e0 (libc.so.6:memcpy@@GLIBC_2.14) redirected to 0x4a2a6e0 (_vgnU_ifunc_wrapper) --958-- REDIR: 0x50ddda0 (libc.so.6:strpbrk) redirected to 0x4a2a6e0 (_vgnU_ifunc_wrapper) --958-- REDIR: 0x50dd7c0 (libc.so.6:index) redirected to 0x4a2a6e0 (_vgnU_ifunc_wrapper) --958-- REDIR: 0x50ddc70 (libc.so.6:strlen) redirected to 0x4a2a6e0 (_vgnU_ifunc_wrapper) --958-- REDIR: 0x50e86c0 (libc.so.6:memrchr) redirected to 0x4a2a6e0 (_vgnU_ifunc_wrapper) --958-- REDIR: 0x50deff0 (libc.so.6:strcasecmp_l) redirected to 0x4a2a6e0 (_vgnU_ifunc_wrapper) --958-- REDIR: 0x50debe0 (libc.so.6:memchr) redirected to 0x4a2a6e0 (_vgnU_ifunc_wrapper) --958-- REDIR: 0x50fceb0 (libc.so.6:wcslen) redirected to 0x4a2a6e0 (_vgnU_ifunc_wrapper) --958-- REDIR: 0x50de050 (libc.so.6:strspn) redirected to 0x4a2a6e0 (_vgnU_ifunc_wrapper) --958-- REDIR: 0x50def20 (libc.so.6:stpncpy) redirected to 0x4a2a6e0 (_vgnU_ifunc_wrapper) --958-- REDIR: 0x50deef0 (libc.so.6:stpcpy) redirected to 0x4a2a6e0 (_vgnU_ifunc_wrapper) --958-- REDIR: 0x50e07f0 (libc.so.6:strchrnul) redirected to 0x4a2a6e0 (_vgnU_ifunc_wrapper) --958-- REDIR: 0x50df040 (libc.so.6:strncasecmp_l) redirected to 0x4a2a6e0 (_vgnU_ifunc_wrapper) --958-- REDIR: 0x51ce3c0 (libc.so.6:__strrchr_avx2) redirected to 0x4c32730 (rindex) --958-- REDIR: 0x50d7070 (libc.so.6:malloc) redirected to 0x4c2faa0 (malloc) --958-- REDIR: 0x50da030 (libc.so.6:calloc) redirected to 0x4c31a70 (calloc) --958-- Reading syms from /home/lalit/mysql_tar/mysql/5.7.29/lib/libmysqlclient.so.20.3.16 --958-- Reading syms from /lib/x86_64-linux-gnu/libpthread-2.27.so --958-- Considering /usr/lib/debug/.build-id/28/c6aade70b2d40d1f0f3d0a1a0cad1ab816448f.debug .. --958-- .. build-id is valid --958-- Reading syms from /lib/x86_64-linux-gnu/librt-2.27.so --958-- Considering /lib/x86_64-linux-gnu/librt-2.27.so .. --958-- .. CRC mismatch (computed 16979484 wanted f9e041e3) --958-- Considering /usr/lib/debug/lib/x86_64-linux-gnu/librt-2.27.so .. --958-- .. CRC is valid --958-- Reading syms from /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.25 --958-- object doesn't have a symbol table --958-- Reading syms from /lib/x86_64-linux-gnu/libm-2.27.so --958-- Considering /lib/x86_64-linux-gnu/libm-2.27.so .. --958-- .. CRC mismatch (computed 7feae033 wanted b29b2508) --958-- Considering /usr/lib/debug/lib/x86_64-linux-gnu/libm-2.27.so .. --958-- .. CRC is valid --958-- Reading syms from /lib/x86_64-linux-gnu/libgcc_s.so.1 --958-- object doesn't have a symbol table --958-- REDIR: 0x50d7950 (libc.so.6:free) redirected to 0x4c30cd0 (free) --958-- REDIR: 0x50deb20 (libc.so.6:strstr) redirected to 0x4a2a6e0 (_vgnU_ifunc_wrapper) --958-- REDIR: 0x50ddcd0 (libc.so.6:strncat) redirected to 0x4a2a6e0 (_vgnU_ifunc_wrapper) --958-- Discarding syms at 0x5895ad0-0x5a64628 in /home/lalit/mysql_tar/mysql/5.7.29/lib/libmysqlclient.so.20.3.16 due to munmap() ==958== ==958== HEAP SUMMARY: ==958== in use at exit: 86,098 bytes in 27 blocks ==958== total heap usage: 39 allocs, 12 frees, 91,189 bytes allocated ==958== ==958== Searching for pointers to 27 not-freed blocks ==958== Checked 145,304 bytes ==958== ==958== 160 bytes in 5 blocks are still reachable in loss record 1 of 7 ==958== at 0x4C2FB0F: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so) ==958== by 0x4016027: _dl_close_worker.part.0 (dl-close.c:395) ==958== by 0x4016AA9: _dl_close_worker (dl-close.c:125) ==958== by 0x4016AA9: _dl_close (dl-close.c:842) ==958== by 0x51A72DE: _dl_catch_exception (dl-error-skeleton.c:196) ==958== by 0x51A736E: _dl_catch_error (dl-error-skeleton.c:215) ==958== by 0x4E3D734: _dlerror_run (dlerror.c:162) ==958== by 0x4E3D0B2: dlclose (dlclose.c:46) ==958== by 0x1087B0: main (mysql_dlopen.c:20) ==958== ==958== 180 bytes in 5 blocks are still reachable in loss record 2 of 7 ==958== at 0x4C2FB0F: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so) ==958== by 0x401D329: strdup (strdup.c:42) ==958== by 0x4018656: _dl_load_cache_lookup (dl-cache.c:315) ==958== by 0x4009382: _dl_map_object (dl-load.c:2255) ==958== by 0x400E311: openaux (dl-deps.c:63) ==958== by 0x51A72DE: _dl_catch_exception (dl-error-skeleton.c:196) ==958== by 0x400E617: _dl_map_object_deps (dl-deps.c:249) ==958== by 0x4014F48: dl_open_worker (dl-open.c:278) ==958== by 0x51A72DE: _dl_catch_exception (dl-error-skeleton.c:196) ==958== by 0x40147C9: _dl_open (dl-open.c:605) ==958== by 0x4E3CF95: dlopen_doit (dlopen.c:66) ==958== by 0x51A72DE: _dl_catch_exception (dl-error-skeleton.c:196) ==958== ==958== 180 bytes in 5 blocks are still reachable in loss record 3 of 7 ==958== at 0x4C2FB0F: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so) ==958== by 0x400C3E7: _dl_new_object (dl-object.c:163) ==958== by 0x40069A4: _dl_map_object_from_fd (dl-load.c:943) ==958== by 0x4008FFB: _dl_map_object (dl-load.c:2389) ==958== by 0x400E311: openaux (dl-deps.c:63) ==958== by 0x51A72DE: _dl_catch_exception (dl-error-skeleton.c:196) ==958== by 0x400E617: _dl_map_object_deps (dl-deps.c:249) ==958== by 0x4014F48: dl_open_worker (dl-open.c:278) ==958== by 0x51A72DE: _dl_catch_exception (dl-error-skeleton.c:196) ==958== by 0x40147C9: _dl_open (dl-open.c:605) ==958== by 0x4E3CF95: dlopen_doit (dlopen.c:66) ==958== by 0x51A72DE: _dl_catch_exception (dl-error-skeleton.c:196) ==958== ==958== 2,904 bytes in 5 blocks are still reachable in loss record 4 of 7 ==958== at 0x4C31B25: calloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so) ==958== by 0x4011E85: _dl_check_map_versions (dl-version.c:274) ==958== by 0x401524B: dl_open_worker (dl-open.c:284) ==958== by 0x51A72DE: _dl_catch_exception (dl-error-skeleton.c:196) ==958== by 0x40147C9: _dl_open (dl-open.c:605) ==958== by 0x4E3CF95: dlopen_doit (dlopen.c:66) ==958== by 0x51A72DE: _dl_catch_exception (dl-error-skeleton.c:196) ==958== by 0x51A736E: _dl_catch_error (dl-error-skeleton.c:215) ==958== by 0x4E3D734: _dlerror_run (dlerror.c:162) ==958== by 0x4E3D050: dlopen@@GLIBC_2.2.5 (dlopen.c:87) ==958== by 0x108769: main (mysql_dlopen.c:11) ==958== ==958== 4,064 bytes in 1 blocks are still reachable in loss record 5 of 7 ==958== at 0x4C31B25: calloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so) ==958== by 0x400ACF9: do_lookup_unique (dl-lookup.c:251) ==958== by 0x400ACF9: do_lookup_x (dl-lookup.c:527) ==958== by 0x400B1EE: _dl_lookup_symbol_x (dl-lookup.c:813) ==958== by 0x400CAF8: elf_machine_rela (dl-machine.h:308) ==958== by 0x400CAF8: elf_dynamic_do_Rela (do-rel.h:137) ==958== by 0x400CAF8: _dl_relocate_object (dl-reloc.c:258) ==958== by 0x40150BC: dl_open_worker (dl-open.c:382) ==958== by 0x51A72DE: _dl_catch_exception (dl-error-skeleton.c:196) ==958== by 0x40147C9: _dl_open (dl-open.c:605) ==958== by 0x4E3CF95: dlopen_doit (dlopen.c:66) ==958== by 0x51A72DE: _dl_catch_exception (dl-error-skeleton.c:196) ==958== by 0x51A736E: _dl_catch_error (dl-error-skeleton.c:215) ==958== by 0x4E3D734: _dlerror_run (dlerror.c:162) ==958== by 0x4E3D050: dlopen@@GLIBC_2.2.5 (dlopen.c:87) ==958== ==958== 5,906 bytes in 5 blocks are still reachable in loss record 6 of 7 ==958== at 0x4C31B25: calloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so) ==958== by 0x400C100: _dl_new_object (dl-object.c:73) ==958== by 0x40069A4: _dl_map_object_from_fd (dl-load.c:943) ==958== by 0x4008FFB: _dl_map_object (dl-load.c:2389) ==958== by 0x400E311: openaux (dl-deps.c:63) ==958== by 0x51A72DE: _dl_catch_exception (dl-error-skeleton.c:196) ==958== by 0x400E617: _dl_map_object_deps (dl-deps.c:249) ==958== by 0x4014F48: dl_open_worker (dl-open.c:278) ==958== by 0x51A72DE: _dl_catch_exception (dl-error-skeleton.c:196) ==958== by 0x40147C9: _dl_open (dl-open.c:605) ==958== by 0x4E3CF95: dlopen_doit (dlopen.c:66) ==958== by 0x51A72DE: _dl_catch_exception (dl-error-skeleton.c:196) ==958== ==958== 72,704 bytes in 1 blocks are still reachable in loss record 7 of 7 ==958== at 0x4C2FB0F: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so) ==958== by 0x6529415: ??? (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.25) ==958== by 0x4010732: call_init (dl-init.c:72) ==958== by 0x4010732: _dl_init (dl-init.c:119) ==958== by 0x40151FE: dl_open_worker (dl-open.c:522) ==958== by 0x51A72DE: _dl_catch_exception (dl-error-skeleton.c:196) ==958== by 0x40147C9: _dl_open (dl-open.c:605) ==958== by 0x4E3CF95: dlopen_doit (dlopen.c:66) ==958== by 0x51A72DE: _dl_catch_exception (dl-error-skeleton.c:196) ==958== by 0x51A736E: _dl_catch_error (dl-error-skeleton.c:215) ==958== by 0x4E3D734: _dlerror_run (dlerror.c:162) ==958== by 0x4E3D050: dlopen@@GLIBC_2.2.5 (dlopen.c:87) ==958== by 0x108769: main (mysql_dlopen.c:11) ==958== ==958== LEAK SUMMARY: ==958== definitely lost: 0 bytes in 0 blocks ==958== indirectly lost: 0 bytes in 0 blocks ==958== possibly lost: 0 bytes in 0 blocks ==958== still reachable: 86,098 bytes in 27 blocks ==958== suppressed: 0 bytes in 0 blocks ==958== ==958== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0) ==958== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0) Suggested fix: still reachable blocks should be 0