[egenix-users] Glibc Memory corruption issues with Python 2.7

B.Nanda Kishore madhav.bnk at gmail.com
Tue Jul 23 18:22:37 CEST 2013 

Hi Everybody,

I am running into glibc memory corruption issues when I try to access mssql
db using mxodbc,
using SQLAlchemy ORM with Python 2.7 alone(everything works fine with
Python 2.6).
Given below is the stack trace. Can someone let me know what I am missing ?
Currently I have 2.12 version of glibc.

---------- Stack Trace ---------------

Python 2.7.3 (default, Apr 10 2013, 05:46:21)
[GCC 4.6.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> from sqlalchemy.orm import sessionmaker
>>> from sqlalchemy import create_engine
>>>
>>> Session = sessionmaker()
>>> engine = create_engine('mssql+mxodbc://my_user:my_pwd@my_dsn')
>>> conn = engine.connect()
*** glibc detected *** /usr/bin/python: double free or corruption (!prev):
0x09eecf48 ***
======= Backtrace: =========
/lib/i386-linux-gnu/libc.so.6(+0x75ee2)[0xb7437ee2]
/my_instance/parts/unixODBC/lib/libodbc.so.1(SQLExecDirectW+0x567)[0xb6d29427]
/my_instance/eggs/egenix_mxodbc-3.1.1-py2.7-linux-i686.egg/mx/ODBC/unixODBC/mxODBC.so(+0x12b97)[0xb6d7ab97]
/my_instance/eggs/egenix_mxodbc-3.1.1-py2.7-linux-i686.egg/mx/ODBC/unixODBC/mxODBC.so(+0x1441b)[0xb6d7c41b]
/usr/bin/python(PyEval_EvalFrameEx+0x5a07)[0x81a2d47]
======= Memory map: ========
08048000-0829e000 r-xp 00000000 fc:01 11141548   /usr/bin/python2.7
0829e000-0829f000 r--p 00255000 fc:01 11141548   /usr/bin/python2.7
0829f000-082f4000 rw-p 00256000 fc:01 11141548   /usr/bin/python2.7
082f4000-08300000 rw-p 00000000 00:00 0
099a3000-09f66000 rw-p 00000000 00:00 0          [heap]
b6c85000-b6c86000 rw-p 00000000 00:00 0
b6c86000-b6c88000 r-xp 00000000 fc:01 11143751
/usr/lib/i386-linux-gnu/gconv/CP1252.so
b6c88000-b6c89000 r--p 00001000 fc:01 11143751
/usr/lib/i386-linux-gnu/gconv/CP1252.so
b6c89000-b6c8a000 rw-p 00002000 fc:01 11143751
/usr/lib/i386-linux-gnu/gconv/CP1252.so
b6c8a000-b6c9f000 r-xp 00000000 00:13 264309
/my_instance/parts/unixODBC/lib/libodbcinst.so.1.0.0
b6c9f000-b6ca0000 r--p 00014000 00:13 264309
/my_instance/parts/unixODBC/lib/libodbcinst.so.1.0.0
b6ca0000-b6ca1000 rw-p 00015000 00:13 264309
/my_instance/parts/unixODBC/lib/libodbcinst.so.1.0.0
b6ca1000-b6cf2000 r-xp 00000000 00:13 264437
/my_instance/parts/FreeTDS/lib/libtdsodbc.so.0.0.0
b6cf2000-b6cf4000 r--p 00050000 00:13 264437
/my_instance/parts/FreeTDS/lib/libtdsodbc.so.0.0.0
b6cf4000-b6cf5000 rw-p 00052000 00:13 264437
/my_instance/parts/FreeTDS/lib/libtdsodbc.so.0.0.0
b6cf5000-b6d62000 r-xp 00000000 00:13 264314
/my_instance/parts/unixODBC/lib/libodbc.so.1.0.0
b6d62000-b6d63000 r--p 0006c000 00:13 264314
/my_instance/parts/unixODBC/lib/libodbc.so.1.0.0
b6d63000-b6d67000 rw-p 0006d000 00:13 264314
/my_instance/parts/unixODBC/lib/libodbc.so.1.0.0
b6d67000-b6d68000 rw-p 00000000 00:00 0
b6d68000-b6d8c000 r-xp 00000000 00:13 133343
/my_instance/eggs/egenix_mxodbc-3.1.1-py2.7-linux-i686.egg/mx/ODBC/unixODBC/mxODBC.so
b6d8c000-b6d90000 r--p 00023000 00:13 133343
/my_instance/eggs/egenix_mxodbc-3.1.1-py2.7-linux-i686.egg/mx/ODBC/unixODBC/mxODBC.so
b6d90000-b6d91000 rw-p 00027000 00:13 133343
/my_instance/eggs/egenix_mxodbc-3.1.1-py2.7-linux-i686.egg/mx/ODBC/unixODBC/mxODBC.so
b6d91000-b6d98000 r-xp 00000000 fc:01 10485788   /lib/i386-linux-gnu/
librt-2.15.so
b6d98000-b6d99000 r--p 00006000 fc:01 10485788   /lib/i386-linux-gnu/
librt-2.15.so
b6d99000-b6d9a000 rw-p 00007000 fc:01 10485788   /lib/i386-linux-gnu/
librt-2.15.so
b6d9d000-b6da8000 r-xp 00000000 fc:01 10485785   /lib/i386-linux-gnu/
libnss_files-2.15.so
b6da8000-b6da9000 r--p 0000a000 fc:01 10485785   /lib/i386-linux-gnu/
libnss_files-2.15.so
b6da9000-b6daa000 rw-p 0000b000 fc:01 10485785   /lib/i386-linux-gnu/
libnss_files-2.15.so
b6daa000-b6db8000 r-xp 00000000 00:13 133439
/my_instance/eggs/egenix_mx_base-3.2.1-py2.7-linux-i686.egg/mx/DateTime/mxDateTime/mxDateTime.so
b6db8000-b6db9000 r--p 0000d000 00:13 133439
/my_instance/eggs/egenix_mx_base-3.2.1-py2.7-linux-i686.egg/mx/DateTime/mxDateTime/mxDateTime.so
b6db9000-b6dba000 rw-p 0000e000 00:13 133439
/my_instance/eggs/egenix_mx_base-3.2.1-py2.7-linux-i686.egg/mx/DateTime/mxDateTime/mxDateTime.so
b6dbb000-b6dbe000 r-xp 00000000 00:13 264723
/my_instance/eggs/SQLAlchemy-0.8.2-py2.7-linux-i686.egg/sqlalchemy/cresultproxy.so
b6dbe000-b6dbf000 r--p 00002000 00:13 264723
/my_instance/eggs/SQLAlchemy-0.8.2-py2.7-linux-i686.egg/sqlalchemy/cresultproxy.so
b6dbf000-b6dc0000 rw-p 00003000 00:13 264723
/my_instance/eggs/SQLAlchemy-0.8.2-py2.7-linux-i686.egg/sqlalchemy/cresultproxy.so
b6dc0000-b6dc1000 r-xp 00000000 00:13 264722
/my_instance/eggs/SQLAlchemy-0.8.2-py2.7-linux-i686.egg/sqlalchemy/cutils.so
b6dc1000-b6dc2000 r--p 00000000 00:13 264722
/my_instance/eggs/SQLAlchemy-0.8.2-py2.7-linux-i686.egg/sqlalchemy/cutils.so
b6dc2000-b6dc3000 rw-p 00001000 00:13 264722
/my_instance/eggs/SQLAlchemy-0.8.2-py2.7-linux-i686.egg/sqlalchemy/cutils.so
b6dc3000-b6ea6000 rw-p 00000000 00:00 0
b6ea7000-b6ea9000 r-xp 00000000 00:13 264717
/my_instance/eggs/SQLAlchemy-0.8.2-py2.7-linux-i686.egg/sqlalchemy/cprocessors.so
b6ea9000-b6eaa000 r--p 00001000 00:13 264717
/my_instance/eggs/SQLAlchemy-0.8.2-py2.7-linux-i686.egg/sqlalchemy/cprocessors.so
b6eaa000-b6eab000 rw-p 00002000 00:13 264717
/my_instance/eggs/SQLAlchemy-0.8.2-py2.7-linux-i686.egg/sqlalchemy/cprocessors.so
b6eab000-b6eec000 rw-p 00000000 00:00 0
b6eed000-b6f00000 r-xp 00000000 fc:01 11147242
/usr/lib/python2.7/lib-dynload/datetime.so
b6f00000-b6f01000 r--p 00012000 fc:01 11147242
/usr/lib/python2.7/lib-dynload/datetime.so
b6f01000-b6f04000 rw-p 00013000 fc:01 11147242
/usr/lib/python2.7/lib-dynload/datetime.so
b6f04000-b6fc7000 rw-p 00000000 00:00 0
b6fd1000-b6fdb000 r-xp 00000000 fc:01 10485789   /lib/i386-linux-gnu/
libnss_nis-2.15.so
b6fdb000-b6fdc000 r--p 00009000 fc:01 10485789   /lib/i386-linux-gnu/
libnss_nis-2.15.so
b6fdc000-b6fdd000 rw-p 0000a000 fc:01 10485789   /lib/i386-linux-gnu/
libnss_nis-2.15.so
b6fdd000-b6ff3000 r-xp 00000000 fc:01 10485801   /lib/i386-linux-gnu/
libnsl-2.15.so
b6ff3000-b6ff4000 r--p 00015000 fc:01 10485801   /lib/i386-linux-gnu/
libnsl-2.15.so
b6ff4000-b6ff5000 rw-p 00016000 fc:01 10485801   /lib/i386-linux-gnu/
libnsl-2.15.so
b6ff5000-b6ff7000 rw-p 00000000 00:00 0
b7003000-b7005000 r-xp 00000000 fc:01 11144103
/usr/lib/i386-linux-gnu/gconv/ISO8859-1.so
b7005000-b7006000 r--p 00001000 fc:01 11144103
/usr/lib/i386-linux-gnu/gconv/ISO8859-1.so
b7006000-b7007000 rw-p 00002000 fc:01 11144103
/usr/lib/i386-linux-gnu/gconv/ISO8859-1.so
b7007000-b7048000 rw-p 00000000 00:00 0
b7048000-b7064000 r-xp 00000000 fc:01 10485829
/lib/i386-linux-gnu/libtinfo.so.5.9
b7064000-b7066000 r--p 0001b000 fc:01 10485829
/lib/i386-linux-gnu/libtinfo.so.5.9
b7066000-b7067000 rw-p 0001d000 fc:01 10485829
/lib/i386-linux-gnu/libtinfo.so.5.9
b7067000-b709c000 r-xp 00000000 fc:01 10486005
/lib/i386-linux-gnu/libreadline.so.6.2
b709c000-b709d000 r--p 00035000 fc:01 10486005
/lib/i386-linux-gnu/libreadline.so.6.2
b709d000-b70a0000 rw-p 00036000 fc:01 10486005
/lib/i386-linux-gnu/libreadline.so.6.2
b70a0000-b70a1000 rw-p 00000000 00:00 0
b70a2000-b70a9000 r-xp 00000000 fc:01 10485779   /lib/i386-linux-gnu/
libnss_compat-2.15.so
b70a9000-b70aa000 r--p 00006000 fc:01 10485779   /lib/i386-linux-gnu/
libnss_compat-2.15.so
b70aa000-b70ab000 rw-p 00007000 fc:01 10485779   /lib/i386-linux-gnu/
libnss_compat-2.15.so
b70ab000-b70ae000 r-xp 00000000 fc:01 11147246
/usr/lib/python2.7/lib-dynload/_heapq.so
b70ae000-b70af000 r--p 00002000 fc:01 11147246
/usr/lib/python2.7/lib-dynload/_heapq.so
b70af000-b70b1000 rw-p 00003000 fc:01 11147246
/usr/lib/python2.7/lib-dynload/_heapq.so
b70b1000-b72b1000 r--p 00000000 fc:01 11147310
/usr/lib/locale/locale-archive
b72b1000-b72f2000 rw-p 00000000 00:00 0
b72f3000-b7377000 rw-p 00000000 00:00 0
b7377000-b73a1000 r-xp 00000000 fc:01 10485792   /lib/i386-linux-gnu/
libm-2.15.so
b73a1000-b73a2000 r--p 00029000 fc:01 10485792   /lib/i386-linux-gnu/
libm-2.15.so
b73a2000-b73a3000 rw-p 0002a000 fc:01 10485792   /lib/i386-linux-gnu/
libm-2.15.so
b73a3000-b73bf000 r-xp 00000000 fc:01 10485804
/lib/i386-linux-gnu/libgcc_s.so.1
b73bf000-b73c0000 r--p 0001b000 fc:01 10485804
/lib/i386-linux-gnu/libgcc_s.so.1
b73c0000-b73c1000 rw-p 0001c000 fc:01 10485804
/lib/i386-linux-gnu/libgcc_s.so.1
b73c1000-b73c2000 rw-p 00000000 00:00 0
b73c2000-b7565000 r-xp 00000000 fc:01 10485777   /lib/i386-linux-gnu/
libc-2.15.so
b7565000-b7566000 ---p 001a3000 fc:01 10485777   /lib/i386-linux-gnu/
libc-2.15.so
b7566000-b7568000 r--p 001a3000 fc:01 10485777   /lib/i386-linux-gnu/
libc-2.15.so
b7568000-b7569000 rw-p 001a5000 fc:01 10485777   /lib/i386-linux-gnu/
libc-2.15.so
b7569000-b756c000 rw-p 00000000 00:00 0
b756c000-b7580000 r-xp 00000000 fc:01 10485988
/lib/i386-linux-gnu/libz.so.1.2.3.4
b7580000-b7581000 r--p 00013000 fc:01 10485988
/lib/i386-linux-gnu/libz.so.1.2.3.4
b7581000-b7582000 rw-p 00014000 fc:01 10485988
/lib/i386-linux-gnu/libz.so.1.2.3.4
b7582000-b7714000 r-xp 00000000 fc:01 10489622
/lib/i386-linux-gnu/libcrypto.so.1.0.0
b7714000-b7723000 r--p 00192000 fc:01 10489622
/lib/i386-linux-gnu/libcrypto.so.1.0.0
b7723000-b772a000 rw-p 001a1000 fc:01 10489622
/lib/i386-linux-gnu/libcrypto.so.1.0.0
b772a000-b772d000 rw-p 00000000 00:00 0
b772d000-b777e000 r-xp 00000000 fc:01 10489621
/lib/i386-linux-gnu/libssl.so.1.0.0
b777e000-b7780000 r--p 00050000 fc:01 10489621
/lib/i386-linux-gnu/libssl.so.1.0.0
b7780000-b7784000 rw-p 00052000 fc:01 10489621
/lib/i386-linux-gnu/libssl.so.1.0.0
b7784000-b7786000 r-xp 00000000 fc:01 10485776   /lib/i386-linux-gnu/
libutil-2.15.so
b7786000-b7787000 r--p 00001000 fc:01 10485776   /lib/i386-linux-gnu/
libutil-2.15.so
b7787000-b7788000 rw-p 00002000 fc:01 10485776   /lib/i386-linux-gnu/
libutil-2.15.so
b7788000-b7789000 rw-p 00000000 00:00 0
b7789000-b778c000 r-xp 00000000 fc:01 10485796   /lib/i386-linux-gnu/
libdl-2.15.so
b778c000-b778d000 r--p 00002000 fc:01 10485796   /lib/i386-linux-gnu/
libdl-2.15.so
b778d000-b778e000 rw-p 00003000 fc:01 10485796   /lib/i386-linux-gnu/
libdl-2.15.so
b778e000-b77a5000 r-xp 00000000 fc:01 10485790   /lib/i386-linux-gnu/
libpthread-2.15.so
b77a5000-b77a6000 r--p 00016000 fc:01 10485790   /lib/i386-linux-gnu/
libpthread-2.15.so
b77a6000-b77a7000 rw-p 00017000 fc:01 10485790   /lib/i386-linux-gnu/
libpthread-2.15.so
b77a7000-b77a9000 rw-p 00000000 00:00 0
b77aa000-b77ab000 rw-s 00000000 00:04 65538      /SYSV791309fc (deleted)
b77ab000-b77ac000 rw-p 00000000 00:00 0
b77ac000-b77b3000 r--s 00000000 fc:01 11144061
/usr/lib/i386-linux-gnu/gconv/gconv-modules.cache
b77b3000-b77b7000 r-xp 00000000 fc:01 11147190
/usr/lib/python2.7/lib-dynload/readline.so
b77b7000-b77b8000 r--p 00003000 fc:01 11147190
/usr/lib/python2.7/lib-dynload/readline.so
b77b8000-b77b9000 rw-p 00004000 fc:01 11147190
/usr/lib/python2.7/lib-dynload/readline.so
b77b9000-b77bb000 rw-p 00000000 00:00 0
b77bb000-b77bc000 r-xp 00000000 00:00 0          [vdso]
b77bc000-b77dc000 r-xp 00000000 fc:01 10485793   /lib/i386-linux-gnu/
ld-2.15.so
b77dc000-b77dd000 r--p 0001f000 fc:01 10485793   /lib/i386-linux-gnu/
ld-2.15.so
b77dd000-b77de000 rw-p 00020000 fc:01 10485793   /lib/i386-linux-gnu/
ld-2.15.so
bfaa5000-bfac6000 rw-p 00000000 00:00 0          [stack]
Aborted (core dumped)

Regards,
Nanda
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