double free issue in 2.4 (and previous versions)

Running into "python: double free or corruption " that causing my app to
terminate while doing inserts. It seems to happen when inserts are happing
at a fairly high velocity. I've included some info that might be helpful in
tracking it down. From the info, it looks like it may be on returning a
ProgrammingError but I do not receive any errors in the PostgreSQL logs and
the query that is executed right before the double free or corruption issue
completes in Postgres without problem. 100% of queries are inserts and the
debug output compared to the database validates the last command executed is
successful.

Does anyone have any suggestions?

My code for initializing psycopg2 and getting a cursor:
https://gmr.privatepaste.com/776e15d184

It's just a wrapper to deal with a repeating pattern of use in our apps.

Use of that module looks like:

import mypackage.pgsql as pgsql
connection = pgsql.connect(host, port, dbname, user, password)
cursor = pgsql.get_cursor(connection)

Environment:

CentOS 5.3
Python 2.6.6
pgbouncer version 1.3.4

ldd /usr/lib64/python2.6/site-packages/psycopg2/_psycopg.so
linux-vdso.so.1 => (0x00007ffffddff000)
libpq.so.4 => /usr/lib64/libpq.so.4 (0x00007f6ef5811000)
libpthread.so.0 => /lib64/libpthread.so.0 (0x00007f6ef55f6000)
libc.so.6 => /lib64/libc.so.6 (0x00007f6ef529f000)
libssl.so.6 => /lib64/libssl.so.6 (0x00007f6ef5055000)
libcrypto.so.6 => /lib64/libcrypto.so.6 (0x00007f6ef4d04000)
libkrb5.so.3 => /usr/lib64/libkrb5.so.3 (0x00007f6ef4a6e000)
libcrypt.so.1 => /lib64/libcrypt.so.1 (0x00007f6ef4836000)
libresolv.so.2 => /lib64/libresolv.so.2 (0x00007f6ef4621000)
libnsl.so.1 => /lib64/libnsl.so.1 (0x00007f6ef4408000)
/lib64/ld-linux-x86-64.so.2 (0x000000307ba00000)
libgssapi_krb5.so.2 => /usr/lib64/libgssapi_krb5.so.2 (0x00007f6ef41da000)
libcom_err.so.2 => /lib64/libcom_err.so.2 (0x00007f6ef3fd8000)
libk5crypto.so.3 => /usr/lib64/libk5crypto.so.3 (0x00007f6ef3db2000)
libdl.so.2 => /lib64/libdl.so.2 (0x00007f6ef3bae000)
libz.so.1 => /usr/lib64/libz.so.1 (0x00007f6ef399a000)
libkrb5support.so.0 => /usr/lib64/libkrb5support.so.0 (0x00007f6ef3791000)
libkeyutils.so.1 => /lib64/libkeyutils.so.1 (0x00007f6ef358f000)
libselinux.so.1 => /lib64/libselinux.so.1 (0x00007f6ef3376000)
libsepol.so.1 => /lib64/libsepol.so.1 (0x00007f6ef3130000)

(gdb) bt
#0 0x000000307be30215 in call_gmon_start ()
#1 0x000000307be31cc0 in pq_raise (conn=<value optimized out>,
curs=0x419ccd80, pgres=<value optimized out>) at psycopg/pqpath.c:121
#2 0x00000000419ccb60 in ?? ()
(no other symbols resolve as I do not have python compiled with gdb support)

(gdb) frame 1
#1 0x000000307be31cc0 in pq_raise (conn=<value optimized out>,
curs=0x419ccd80, pgres=<value optimized out>) at psycopg/pqpath.c:121
121 return ProgrammingError;

(gdb) info frame 1
Stack frame at 0x419cca90:
rip = 0x307be31cc0 in pq_raise (psycopg/pqpath.c:121); saved rip 0x419ccb60
called by frame at 0x419cca98, caller of frame at 0x419cca60
source language c.
Arglist at 0x419cca58, args: conn=<value optimized out>, curs=0x419ccd80,
pgres=<value optimized out>
Locals at 0x419cca58, Previous frame's sp is 0x419cca90
Saved registers:
rbx at 0x419cca68, rbp at 0x419cca70, r12 at 0x419cca78, r13 at
0x419cca80, rip at 0x419cca88

output from pg_config:

[root(at)rejected01 rejected]# pg_config
BINDIR = /usr/bin
DOCDIR = /usr/share/doc/pgsql
INCLUDEDIR = /usr/include
PKGINCLUDEDIR = /usr/include/pgsql
INCLUDEDIR-SERVER = /usr/include/pgsql/server
LIBDIR = /usr/lib64
PKGLIBDIR = /usr/lib64/pgsql
LOCALEDIR = /usr/share/locale
MANDIR = /usr/share/man
SHAREDIR = /usr/share/pgsql
SYSCONFDIR = /etc/sysconfig/pgsql
PGXS = /usr/lib64/pgsql/pgxs/src/makefiles/pgxs.mk
CONFIGURE = '--build=x86_64-redhat-linux-gnu'
'--host=x86_64-redhat-linux-gnu' '--target=x86_64-redhat-linux-gnu'
'--program-prefix=' '--prefix=/usr' '--exec-prefix=/usr' '--bindir=/usr/bin'
'--sbindir=/usr/sbin' '--sysconfdir=/etc' '--datadir=/usr/share'
'--includedir=/usr/include' '--libdir=/usr/lib64'
'--libexecdir=/usr/libexec' '--localstatedir=/var'
'--sharedstatedir=/usr/com' '--mandir=/usr/share/man'
'--infodir=/usr/share/info' '--disable-rpath' '--with-perl' '--with-tcl'
'--with-tclconfig=/usr/lib64' '--with-python' '--with-openssl' '--with-pam'
'--with-krb5' '--enable-nls' '--enable-thread-safety'
'--sysconfdir=/etc/sysconfig/pgsql' '--datadir=/usr/share/pgsql'
'--with-docdir=/usr/share/doc' 'CFLAGS=-O2 -g -pipe -Wall
-Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector
--param=ssp-buffer-size=4 -m64 -mtune=generic'
'build_alias=x86_64-redhat-linux-gnu' 'host_alias=x86_64-redhat-linux-gnu'
'target_alias=x86_64-redhat-linux-gnu'
CC = gcc
CPPFLAGS = -D_GNU_SOURCE
CFLAGS = -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions
-fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic -Wall
-Wmissing-prototypes -Wpointer-arith -Winline -Wdeclaration-after-statement
-Wendif-labels -fno-strict-aliasing
CFLAGS_SL = -fpic
LDFLAGS =
LDFLAGS_SL =
LIBS = -lpgport -lpam -lssl -lcrypto -lkrb5 -lz -lreadline -ltermcap -lcrypt
-lresolv -lnsl -ldl -lm -lbsd
VERSION = PostgreSQL 8.1.11

stdout from app:

*** glibc detected *** python: double free or corruption (!prev):
0x000000000104c520 ***
======= Backtrace: =========
/lib64/libc.so.6[0x307be71ce2]
/lib64/libc.so.6(cfree+0x8c)[0x307be7590c]
/usr/lib64/python2.6/site-packages/psycopg2/_psycopg.so[0x7fce8d616915]
/usr/lib64/python2.6/site-packages/psycopg2/_psycopg.so[0x7fce8d61bc49]
/usr/lib64/python2.6/site-packages/psycopg2/_psycopg.so[0x7fce8d61c321]
python(PyObject_Call+0x68)[0x418a78]
python(PyEval_CallObjectWithKeywords+0x56)[0x485d96]
python[0x4e2216]
python(PyObject_Call+0x68)[0x418a78]
python(PyEval_EvalFrameEx+0x1127)[0x487ae7]
python(PyEval_EvalCodeEx+0x940)[0x48e180]
python(PyEval_EvalFrameEx+0x56b3)[0x48c073]
python(PyEval_EvalCodeEx+0x940)[0x48e180]
python(PyEval_EvalFrameEx+0x56b3)[0x48c073]
python(PyEval_EvalFrameEx+0x679a)[0x48d15a]
python(PyEval_EvalFrameEx+0x679a)[0x48d15a]
python(PyEval_EvalFrameEx+0x679a)[0x48d15a]
python(PyEval_EvalCodeEx+0x940)[0x48e180]
python(PyEval_EvalFrameEx+0x56b3)[0x48c073]
python(PyEval_EvalFrameEx+0x679a)[0x48d15a]
python(PyEval_EvalFrameEx+0x679a)[0x48d15a]
python(PyEval_EvalCodeEx+0x940)[0x48e180]
python[0x4e566d]
python(PyObject_Call+0x68)[0x418a78]
python[0x41fa8f]
python(PyObject_Call+0x68)[0x418a78]
python(PyEval_CallObjectWithKeywords+0x56)[0x485d96]
python[0x4bd6da]
/lib64/libpthread.so.0[0x307ce06367]
/lib64/libc.so.6(clone+0x6d)[0x307bed2f7d]