Probleme de mémoire avec libpq

**kobton** · 04/08/2008, 14h46

Bonjour,

j'utilise la librairie libpq sous kubuntu (Kdevelop) afin de me connecter a une base de donnee PostGres.

Tout fonctionne hormis le fait que lorsque que je passe mon soft sous valgrind, j'obtiens un rapport d'erreurs bien trop chargé a mon gout.

Par exemple le bout de code suivant :

Code :

Sélectionner tout - Visualiser dans une fenêtre à part

1
2
3
4
5
6
7
8
9
10
 
int main(int argc, char **argv)
{
const char	*conninfo = "dbname = PGF user = pgf_admin password = admin host =monIp";
PGconn		*conn = 0;
PGresult	*res = 0;
 
conn = PQconnectdb(conninfo);
 
PQfinish(conn);

C code genere le rapport suivant avec valgrind :

==29516== Memcheck, a memory error detector.
==29516== Copyright (C) 2002-2007, and GNU GPL'd, by Julian Seward et al.
==29516== Using LibVEX rev 1804, a library for dynamic binary translation.
==29516== Copyright (C) 2004-2007, and GNU GPL'd, by OpenWorks LLP.
==29516== Using valgrind-3.3.0-Debian, a dynamic binary instrumentation framework.
==29516== Copyright (C) 2000-2007, and GNU GPL'd, by Julian Seward et al.
==29516== For more details, rerun with: -v
==29516==
==29516== Invalid read of size 4
==29516== at 0x4015209: (within /lib/ld-2.7.so)
==29516== by 0x4005C69: (within /lib/ld-2.7.so)
==29516== by 0x4007A97: (within /lib/ld-2.7.so)
==29516== by 0x4011543: (within /lib/ld-2.7.so)
==29516== by 0x400D5D5: (within /lib/ld-2.7.so)
==29516== by 0x4010F5D: (within /lib/ld-2.7.so)
==29516== by 0x428E291: (within /lib/tls/i686/cmov/libc-2.7.so)
==29516== by 0x400D5D5: (within /lib/ld-2.7.so)
==29516== by 0x428E454: __libc_dlopen_mode (in /lib/tls/i686/cmov/libc-2.7.so)
==29516== by 0x4268186: __nss_lookup_function (in /lib/tls/i686/cmov/libc-2.7.so)
==29516== by 0x426829F: (within /lib/tls/i686/cmov/libc-2.7.so)
==29516== by 0x426A075: __nss_passwd_lookup (in /lib/tls/i686/cmov/libc-2.7.so)
==29516== Address 0x4726eb4 is 36 bytes inside a block of size 38 alloc'd
==29516== at 0x4022AB8: malloc (vg_replace_malloc.c:207)
==29516== by 0x4008031: (within /lib/ld-2.7.so)
==29516== by 0x4011543: (within /lib/ld-2.7.so)
==29516== by 0x400D5D5: (within /lib/ld-2.7.so)
==29516== by 0x4010F5D: (within /lib/ld-2.7.so)
==29516== by 0x428E291: (within /lib/tls/i686/cmov/libc-2.7.so)
==29516== by 0x400D5D5: (within /lib/ld-2.7.so)
==29516== by 0x428E454: __libc_dlopen_mode (in /lib/tls/i686/cmov/libc-2.7.so)
==29516== by 0x4268186: __nss_lookup_function (in /lib/tls/i686/cmov/libc-2.7.so)
==29516== by 0x426829F: (within /lib/tls/i686/cmov/libc-2.7.so)
==29516== by 0x426A075: __nss_passwd_lookup (in /lib/tls/i686/cmov/libc-2.7.so)
==29516== by 0x4214D92: getpwuid_r (in /lib/tls/i686/cmov/libc-2.7.so)
==29516==
==29516== Invalid read of size 4
==29516== at 0x4015237: (within /lib/ld-2.7.so)
==29516== by 0x4005C69: (within /lib/ld-2.7.so)
==29516== by 0x4007A97: (within /lib/ld-2.7.so)
==29516== by 0x400BC16: (within /lib/ld-2.7.so)
==29516== by 0x400D5D5: (within /lib/ld-2.7.so)
==29516== by 0x400BDF9: (within /lib/ld-2.7.so)
==29516== by 0x40115A3: (within /lib/ld-2.7.so)
==29516== by 0x400D5D5: (within /lib/ld-2.7.so)
==29516== by 0x4010F5D: (within /lib/ld-2.7.so)
==29516== by 0x428E291: (within /lib/tls/i686/cmov/libc-2.7.so)
==29516== by 0x400D5D5: (within /lib/ld-2.7.so)
==29516== by 0x428E454: __libc_dlopen_mode (in /lib/tls/i686/cmov/libc-2.7.so)
==29516== Address 0x47271fc is 28 bytes inside a block of size 31 alloc'd
==29516== at 0x4022AB8: malloc (vg_replace_malloc.c:207)
==29516== by 0x4008031: (within /lib/ld-2.7.so)
==29516== by 0x400BC16: (within /lib/ld-2.7.so)
==29516== by 0x400D5D5: (within /lib/ld-2.7.so)
==29516== by 0x400BDF9: (within /lib/ld-2.7.so)
==29516== by 0x40115A3: (within /lib/ld-2.7.so)
==29516== by 0x400D5D5: (within /lib/ld-2.7.so)
==29516== by 0x4010F5D: (within /lib/ld-2.7.so)
==29516== by 0x428E291: (within /lib/tls/i686/cmov/libc-2.7.so)
==29516== by 0x400D5D5: (within /lib/ld-2.7.so)
==29516== by 0x428E454: __libc_dlopen_mode (in /lib/tls/i686/cmov/libc-2.7.so)
==29516== by 0x4268186: __nss_lookup_function (in /lib/tls/i686/cmov/libc-2.7.so)
==29516==
==29516== Invalid read of size 4
==29516== at 0x40151F3: (within /lib/ld-2.7.so)
==29516== by 0x4005C69: (within /lib/ld-2.7.so)
==29516== by 0x4007A97: (within /lib/ld-2.7.so)
==29516== by 0x4011543: (within /lib/ld-2.7.so)
==29516== by 0x400D5D5: (within /lib/ld-2.7.so)
==29516== by 0x4010F5D: (within /lib/ld-2.7.so)
==29516== by 0x428E291: (within /lib/tls/i686/cmov/libc-2.7.so)
==29516== by 0x400D5D5: (within /lib/ld-2.7.so)
==29516== by 0x428E454: __libc_dlopen_mode (in /lib/tls/i686/cmov/libc-2.7.so)
==29516== by 0x4268186: __nss_lookup_function (in /lib/tls/i686/cmov/libc-2.7.so)
==29516== by 0x4AF2FFB: (within /lib/tls/i686/cmov/libnss_compat-2.7.so)
==29516== by 0x4AF413C: _nss_compat_getpwuid_r (in /lib/tls/i686/cmov/libnss_compat-2.7.so)
==29516== Address 0x47278a8 is 32 bytes inside a block of size 35 alloc'd
==29516== at 0x4022AB8: malloc (vg_replace_malloc.c:207)
==29516== by 0x4008031: (within /lib/ld-2.7.so)
==29516== by 0x4011543: (within /lib/ld-2.7.so)
==29516== by 0x400D5D5: (within /lib/ld-2.7.so)
==29516== by 0x4010F5D: (within /lib/ld-2.7.so)
==29516== by 0x428E291: (within /lib/tls/i686/cmov/libc-2.7.so)
==29516== by 0x400D5D5: (within /lib/ld-2.7.so)
==29516== by 0x428E454: __libc_dlopen_mode (in /lib/tls/i686/cmov/libc-2.7.so)
==29516== by 0x4268186: __nss_lookup_function (in /lib/tls/i686/cmov/libc-2.7.so)
==29516== by 0x4AF2FFB: (within /lib/tls/i686/cmov/libnss_compat-2.7.so)
==29516== by 0x4AF413C: _nss_compat_getpwuid_r (in /lib/tls/i686/cmov/libnss_compat-2.7.so)
==29516== by 0x4214D15: getpwuid_r (in /lib/tls/i686/cmov/libc-2.7.so)
==29516==
==29516== Invalid read of size 4
==29516== at 0x4015209: (within /lib/ld-2.7.so)
==29516== by 0x4005C69: (within /lib/ld-2.7.so)
==29516== by 0x4007A97: (within /lib/ld-2.7.so)
==29516== by 0x400BC16: (within /lib/ld-2.7.so)
==29516== by 0x400D5D5: (within /lib/ld-2.7.so)
==29516== by 0x400BDF9: (within /lib/ld-2.7.so)
==29516== by 0x40115A3: (within /lib/ld-2.7.so)
==29516== by 0x400D5D5: (within /lib/ld-2.7.so)
==29516== by 0x4010F5D: (within /lib/ld-2.7.so)
==29516== by 0x428E291: (within /lib/tls/i686/cmov/libc-2.7.so)
==29516== by 0x400D5D5: (within /lib/ld-2.7.so)
==29516== by 0x428E454: __libc_dlopen_mode (in /lib/tls/i686/cmov/libc-2.7.so)
==29516== Address 0x4727bfc is 36 bytes inside a block of size 37 alloc'd
==29516== at 0x4022AB8: malloc (vg_replace_malloc.c:207)
==29516== by 0x4008031: (within /lib/ld-2.7.so)
==29516== by 0x400BC16: (within /lib/ld-2.7.so)
==29516== by 0x400D5D5: (within /lib/ld-2.7.so)
==29516== by 0x400BDF9: (within /lib/ld-2.7.so)
==29516== by 0x40115A3: (within /lib/ld-2.7.so)
==29516== by 0x400D5D5: (within /lib/ld-2.7.so)
==29516== by 0x4010F5D: (within /lib/ld-2.7.so)
==29516== by 0x428E291: (within /lib/tls/i686/cmov/libc-2.7.so)
==29516== by 0x400D5D5: (within /lib/ld-2.7.so)
==29516== by 0x428E454: __libc_dlopen_mode (in /lib/tls/i686/cmov/libc-2.7.so)
==29516== by 0x4268186: __nss_lookup_function (in /lib/tls/i686/cmov/libc-2.7.so)
==29516==
==29516== Conditional jump or move depends on uninitialised value(s)
==29516== at 0x437FEA7: BN_mod_inverse (in /usr/lib/i686/cmov/libcrypto.so.0.9.8)
==29516== by 0x4383E2E: BN_MONT_CTX_set (in /usr/lib/i686/cmov/libcrypto.so.0.9.8)
==29516== by 0x438415E: BN_MONT_CTX_set_locked (in /usr/lib/i686/cmov/libcrypto.so.0.9.8)
==29516== by 0x4398666: (within /usr/lib/i686/cmov/libcrypto.so.0.9.8)
==29516== by 0x439A13D: RSA_public_decrypt (in /usr/lib/i686/cmov/libcrypto.so.0.9.8)
==29516== by 0x439AF29: RSA_verify (in /usr/lib/i686/cmov/libcrypto.so.0.9.8)
==29516== by 0x42E6FA4: ssl3_get_key_exchange (in /usr/lib/i686/cmov/libssl.so.0.9.8)
==29516== by 0x42E8C38: ssl3_connect (in /usr/lib/i686/cmov/libssl.so.0.9.8)
==29516== by 0x42FAE19: SSL_connect (in /usr/lib/i686/cmov/libssl.so.0.9.8)
==29516== by 0x4053D30: (within /usr/lib/libpq.so.5.1)
==29516== by 0x4044842: PQconnectPoll (in /usr/lib/libpq.so.5.1)
==29516== by 0x4045547: (within /usr/lib/libpq.so.5.1)
==29516==
==29516== Conditional jump or move depends on uninitialised value(s)
==29516== at 0x4376DB7: BN_div (in /usr/lib/i686/cmov/libcrypto.so.0.9.8)
==29516== by 0x437CC41: BN_nnmod (in /usr/lib/i686/cmov/libcrypto.so.0.9.8)
==29516== by 0x43808BE: BN_mod_inverse (in /usr/lib/i686/cmov/libcrypto.so.0.9.8)
==29516== by 0x4383E2E: BN_MONT_CTX_set (in /usr/lib/i686/cmov/libcrypto.so.0.9.8)
==29516== by 0x438415E: BN_MONT_CTX_set_locked (in /usr/lib/i686/cmov/libcrypto.so.0.9.8)
==29516== by 0x4398666: (within /usr/lib/i686/cmov/libcrypto.so.0.9.8)
==29516== by 0x439A13D: RSA_public_decrypt (in /usr/lib/i686/cmov/libcrypto.so.0.9.8)
==29516== by 0x439AF29: RSA_verify (in /usr/lib/i686/cmov/libcrypto.so.0.9.8)
==29516== by 0x42E6FA4: ssl3_get_key_exchange (in /usr/lib/i686/cmov/libssl.so.0.9.8)
==29516== by 0x42E8C38: ssl3_connect (in /usr/lib/i686/cmov/libssl.so.0.9.8)
==29516== by 0x42FAE19: SSL_connect (in /usr/lib/i686/cmov/libssl.so.0.9.8)
==29516== by 0x4053D30: (within /usr/lib/libpq.so.5.1)
==29516==
==29516== Conditional jump or move depends on uninitialised value(s)
==29516== at 0x4376DB7: BN_div (in /usr/lib/i686/cmov/libcrypto.so.0.9.8)
==29516== by 0x4383E8F: BN_MONT_CTX_set (in /usr/lib/i686/cmov/libcrypto.so.0.9.8)
==29516== by 0x438415E: BN_MONT_CTX_set_locked (in /usr/lib/i686/cmov/libcrypto.so.0.9.8)
==29516== by 0x4398666: (within /usr/lib/i686/cmov/libcrypto.so.0.9.8)
==29516== by 0x439A13D: RSA_public_decrypt (in /usr/lib/i686/cmov/libcrypto.so.0.9.8)
==29516== by 0x439AF29: RSA_verify (in /usr/lib/i686/cmov/libcrypto.so.0.9.8)
==29516== by 0x42E6FA4: ssl3_get_key_exchange (in /usr/lib/i686/cmov/libssl.so.0.9.8)
==29516== by 0x42E8C38: ssl3_connect (in /usr/lib/i686/cmov/libssl.so.0.9.8)
==29516== by 0x42FAE19: SSL_connect (in /usr/lib/i686/cmov/libssl.so.0.9.8)
==29516== by 0x4053D30: (within /usr/lib/libpq.so.5.1)
==29516== by 0x4044842: PQconnectPoll (in /usr/lib/libpq.so.5.1)
==29516== by 0x4045547: (within /usr/lib/libpq.so.5.1)
==29516==
==29516== Conditional jump or move depends on uninitialised value(s)
==29516== at 0x437FEA7: BN_mod_inverse (in /usr/lib/i686/cmov/libcrypto.so.0.9.8)
==29516== by 0x4383E2E: BN_MONT_CTX_set (in /usr/lib/i686/cmov/libcrypto.so.0.9.8)
==29516== by 0x438415E: BN_MONT_CTX_set_locked (in /usr/lib/i686/cmov/libcrypto.so.0.9.8)
==29516== by 0x43A1F55: (within /usr/lib/i686/cmov/libcrypto.so.0.9.8)
==29516== by 0x43A1A81: DH_generate_key (in /usr/lib/i686/cmov/libcrypto.so.0.9.8)
==29516== by 0x42E5720: ssl3_send_client_key_exchange (in /usr/lib/i686/cmov/libssl.so.0.9.8)
==29516== by 0x42E8C78: ssl3_connect (in /usr/lib/i686/cmov/libssl.so.0.9.8)
==29516== by 0x42FAE19: SSL_connect (in /usr/lib/i686/cmov/libssl.so.0.9.8)
==29516== by 0x4053D30: (within /usr/lib/libpq.so.5.1)
==29516== by 0x4044842: PQconnectPoll (in /usr/lib/libpq.so.5.1)
==29516== by 0x4045547: (within /usr/lib/libpq.so.5.1)
==29516== by 0x4047B14: PQconnectdb (in /usr/lib/libpq.so.5.1)
==29516==
==29516== Conditional jump or move depends on uninitialised value(s)
==29516== at 0x4376DB7: BN_div (in /usr/lib/i686/cmov/libcrypto.so.0.9.8)
==29516== by 0x4383E8F: BN_MONT_CTX_set (in /usr/lib/i686/cmov/libcrypto.so.0.9.8)
==29516== by 0x438415E: BN_MONT_CTX_set_locked (in /usr/lib/i686/cmov/libcrypto.so.0.9.8)
==29516== by 0x43A1F55: (within /usr/lib/i686/cmov/libcrypto.so.0.9.8)
==29516== by 0x43A1A81: DH_generate_key (in /usr/lib/i686/cmov/libcrypto.so.0.9.8)
==29516== by 0x42E5720: ssl3_send_client_key_exchange (in /usr/lib/i686/cmov/libssl.so.0.9.8)
==29516== by 0x42E8C78: ssl3_connect (in /usr/lib/i686/cmov/libssl.so.0.9.8)
==29516== by 0x42FAE19: SSL_connect (in /usr/lib/i686/cmov/libssl.so.0.9.8)
==29516== by 0x4053D30: (within /usr/lib/libpq.so.5.1)
==29516== by 0x4044842: PQconnectPoll (in /usr/lib/libpq.so.5.1)
==29516== by 0x4045547: (within /usr/lib/libpq.so.5.1)
==29516== by 0x4047B14: PQconnectdb (in /usr/lib/libpq.so.5.1)
==29516==
==29516== ERROR SUMMARY: 10 errors from 9 contexts (suppressed: 67 from 1)
==29516== malloc/free: in use at exit: 32,320 bytes in 2,083 blocks.
==29516== malloc/free: 3,202 allocs, 1,119 frees, 816,263 bytes allocated.
==29516== For counts of detected errors, rerun with: -v
==29516== searching for pointers to 2,083 not-freed blocks.
==29516== checked 579,772 bytes.
==29516==
==29516== LEAK SUMMARY:
==29516== definitely lost: 156 bytes in 11 blocks.
==29516== possibly lost: 0 bytes in 0 blocks.
==29516== still reachable: 32,164 bytes in 2,072 blocks.
==29516== suppressed: 0 bytes in 0 blocks.
==29516== Rerun with --leak-check=full to see details of leaked memory.

La connection s'effectue parfaitement et je peux ensuite executer des procedures stockees en base sans probleme entre le "PQconnectdb" et le "PQfinish".

Si je retire "PQconnectdb" du code, je n'ai plus de probleme dans valgrind. Par ailleurs si je met "bonjour" a la place de conninfo, je n'ai pas d'erreurs non plus dans valgrind.

Pour info j'utilise libpq.so.5.1.

J'ai l'impression qu'il y a un vrai probleme dans cette librairie. Quelqu'un a t'il une idée???

Merci d'avance!!

**b_zakaria** · 28/08/2008, 12h23

T'es sûr que c'est pas "libresolv" qui déconne?

**kobton** · 13/01/2009, 10h02

C'est quoi libresolv?

Quel est le rapport avec libpq?

Probleme de mémoire avec libpq

C

Vue hybride

Discussions similaires

Partager

Partager