[Valgrind-users] Seeking for help -- Confused by the result of memcheck

[Zhiyao T. <mc...@gm...>]

Hi,

I tried to use memcheck tool to check whether there're memory leaks in
my program. In the initialization part of my program, I created 2
threads through ACE's wrappers class ACE_Task (my program is based on
ACE library). These two threads are almost same. But the memcheck tool
reports that one of them definitely has memory leak while another
possibly has memory leak (when creating):

==22571== 144 bytes in 1 blocks are possibly lost in loss record 97 of 133
==22571==    at 0x4A1AB36: calloc (vg_replace_malloc.c:279)
==22571==    by 0x400EA4D: _dl_allocate_tls (in /lib/ld-2.3.6.so)
==22571==    by 0x6447500: pthread_create@@GLIBC_2.2.5 (in
/lib/libpthread-2.3.6.so)
==22571==    by 0x577E23C: ACE_OS::thr_create(void* (*)(void*), void*,
long, unsigned long*, unsigned long*, long, void*, unsigned long,
ACE_Base_Thread_Adapter*) (in /usr/lib/libACE.so.5.5.2)
==22571==    by 0x57B185E: ACE_Thread_Manager::spawn_i(void*
(*)(void*), void*, long, unsigned long*, unsigned long*, long, int,
void*, unsigned long, ACE_Task_Base*) (in /usr/lib/libACE.so.5.5.2)
==22571==    by 0x57B4F30: ACE_Thread_Manager::spawn_n(unsigned long,
void* (*)(void*), void*, long, long, int, ACE_Task_Base*, unsigned
long*, void**, unsigned long*) (in /usr/lib/libACE.so.5.5.2)
==22571==    by 0x57AF3F4: ACE_Task_Base::activate(long, int, int,
long, int, ACE_Task_Base*, unsigned long*, void**, unsigned long*,
unsigned long*) (in /usr/lib/libACE.so.5.5.2)
==22571==    by 0x40E162: MyProgram::init(ACE_Reactor*) (aaa.cpp:198)
==22571==
==22571==
==22571== 144 bytes in 1 blocks are definitely lost in loss record 98 of 133
==22571==    at 0x4A1AB36: calloc (vg_replace_malloc.c:279)
==22571==    by 0x400EA4D: _dl_allocate_tls (in /lib/ld-2.3.6.so)
==22571==    by 0x6447500: pthread_create@@GLIBC_2.2.5 (in
/lib/libpthread-2.3.6.so)
==22571==    by 0x577E23C: ACE_OS::thr_create(void* (*)(void*), void*,
long, unsigned long*, unsigned long*, long, void*, unsigned long,
ACE_Base_Thread_Adapter*) (in /usr/lib/libACE.so.5.5.2)
==22571==    by 0x57B185E: ACE_Thread_Manager::spawn_i(void*
(*)(void*), void*, long, unsigned long*, unsigned long*, long, int,
void*, unsigned long, ACE_Task_Base*) (in /usr/lib/libACE.so.5.5.2)
==22571==    by 0x57B4F30: ACE_Thread_Manager::spawn_n(unsigned long,
void* (*)(void*), void*, long, long, int, ACE_Task_Base*, unsigned
long*, void**, unsigned long*) (in /usr/lib/libACE.so.5.5.2)
==22571==    by 0x57AF3F4: ACE_Task_Base::activate(long, int, int,
long, int, ACE_Task_Base*, unsigned long*, void**, unsigned long*,
unsigned long*) (in /usr/lib/libACE.so.5.5.2)
==22571==    by 0x40E028: MyProgram::init(ACE_Reactor*) (aaa.cpp:191)

Definitely I clean both of them after my program finished.

So what's the possible reason of the inconsistency? Can someone give
me some ideas? The valgrind I used is valgrind-3.2.0-Debian and the
platform/OS are x86_64, Debian-Linux 2.6.16-2-em64t-p4-smp.

Thanks a lot!