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Luke Burden
luke at demonware.net
Fri Nov 28 18:16:08 EST 2008
Hmm, MySQLdb is certainly up to date - no new release since early 2007! .. Might be able to force an upgrade of the mysqlclient libs though. Do any of the following python modules potentially use mysql? Besides mod_python, I wouldn't have thought so .. it's more or less a vanilla install of apache. alias.conf authz_default.load autoindex.conf dir.conf mime.load setenvif.conf alias.load authz_groupfile.load autoindex.load dir.load mod_python.load setenvif.load auth_basic.load authz_host.load cgid.conf env.load negotiation.conf status.conf authn_file.load authz_user.load cgid.load mime.conf negotiation.load status.load Thanks Luke On Fri, Nov 28, 2008 at 2:41 PM, Graham Dumpleton <graham.dumpleton at gmail.com> wrote: > Would be wise to ensure using recent MySQL client libraries and Python > wrappers if need be, as there are some dodgy versions that have been > known to cause problems under mod_python. > > Other than that, since you seemed to have checked PHP conflict > problems, only thing can mention is to make sure you don't have any > other Apache modules installed with use MySQL such as a > mod_auth_mysql. > > Graham > > 2008/11/29 Luke Burden <luke at demonware.net>: >> Hi Graham, >> >> I'm a developer for a internally facing web application, which uses >> apache + mod_python + mysql. >> As the application is being increasingly used, I've noticed several >> errors occurring sporadically, but regularly enough to be cause for >> concern. Concern morphed into alarm when I found I could reproduce >> the problems by quickly and repeatedly refreshing a page that causes a >> number of queries to be executed! >> >> The problem manifests itself in either bad behavior from the python >> MySQLDb module: >> >> InterfaceError: (0, '') >> OperationalError: (2013, 'Lost connection to MySQL server during query') >> ProgrammingError: (2014, "Commands out of sync; you can't run this >> command now") (<- might be unrelated) >> .. and NoneType result sets where the data is basically not there, >> when it should be. >> >> Or in apache seg-faulting: >> >> [Fri Nov 28 21:34:42 2008] [notice] mod_python: Creating 8 session >> mutexes based on 6 max processes and 25 max threads. >> [Fri Nov 28 21:34:42 2008] [notice] mod_python: using mutex_directory /tmp >> [Fri Nov 28 21:34:42 2008] [notice] Apache/2.2.4 (Ubuntu) >> mod_python/3.3.1 Python/2.5.1 configured -- resuming normal operations >> [Fri Nov 28 21:35:03 2008] [error] [client 192.168.179.1] File does >> not exist: /var/www/favicon.ico >> [Fri Nov 28 21:35:04 2008] [error] [client 192.168.179.1] File does >> not exist: /var/www/favicon.ico >> [Fri Nov 28 21:35:06 2008] [error] [client 192.168.179.1] File does >> not exist: /var/www/favicon.ico >> [Fri Nov 28 21:35:06 2008] [error] [client 192.168.179.1] File does >> not exist: /var/www/favicon.ico >> [Fri Nov 28 21:35:07 2008] [notice] child pid 17523 exit signal >> Segmentation fault (11) >> [Fri Nov 28 21:35:07 2008] [error] [client 192.168.179.1] File does >> not exist: /var/www/favicon.ico >> [Fri Nov 28 21:35:07 2008] [error] [client 192.168.179.1] File does >> not exist: /var/www/favicon.ico >> [Fri Nov 28 21:35:08 2008] [error] [client 192.168.179.1] File does >> not exist: /var/www/favicon.ico >> [Fri Nov 28 21:35:15 2008] [notice] child pid 17525 exit signal >> Segmentation fault (11) >> [Fri Nov 28 21:35:15 2008] [notice] child pid 17579 exit signal >> Segmentation fault (11) >> [Fri Nov 28 21:35:16 2008] [error] [client 192.168.179.1] File does >> not exist: /var/www/favicon.ico >> [Fri Nov 28 21:35:17 2008] [notice] child pid 17607 exit signal >> Segmentation fault (11) >> [Fri Nov 28 21:35:19 2008] [error] [client 192.168.179.1] File does >> not exist: /var/www/favicon.ico >> ... etc ... >> >> A closer look at one of the segmentation faults: >> >> *** glibc detected *** /usr/sbin/apache2: double free or corruption (!prev): >> 0x000000000212a1c0 *** >> ======= Backtrace: ========= >> /lib/libc.so.6[0x2b6915ed7b0a] >> /lib/libc.so.6(cfree+0x8c)[0x2b6915edb6fc] >> /usr/lib/libmysqlclient_r.so.15(vio_delete+0x19)[0x2aaaadef6ff9] >> /usr/lib/libmysqlclient_r.so.15(end_server+0x2f)[0x2aaaadef2eff] >> /usr/lib/libmysqlclient_r.so.15(cli_safe_read+0x2b)[0x2aaaadef305b] >> /usr/lib/libmysqlclient_r.so.15(cli_advanced_command+0x195)[0x2aaaadef5675] >> /usr/lib/libmysqlclient_r.so.15(mysql_ping+0x31)[0x2aaaadec71a1] >> /var/lib/python-support/python2.5/_mysql.so[0x2aaaadc5e7e6] >> /usr/lib/libpython2.5.so.1.0(PyEval_EvalFrameEx+0x6335)[0x2b691a2ccd15] >> /usr/lib/libpython2.5.so.1.0(PyEval_EvalCodeEx+0x836)[0x2b691a2cdb06] >> /usr/lib/libpython2.5.so.1.0(PyEval_EvalFrameEx+0x553d)[0x2b691a2cbf1d] >> /usr/lib/libpython2.5.so.1.0(PyEval_EvalFrameEx+0x6564)[0x2b691a2ccf44] >> /usr/lib/libpython2.5.so.1.0(PyEval_EvalFrameEx+0x6564)[0x2b691a2ccf44] >> /usr/lib/libpython2.5.so.1.0(PyEval_EvalCodeEx+0x836)[0x2b691a2cdb06] >> /usr/lib/libpython2.5.so.1.0(PyEval_EvalFrameEx+0x553d)[0x2b691a2cbf1d] >> /usr/lib/libpython2.5.so.1.0(PyEval_EvalCodeEx+0x836)[0x2b691a2cdb06] >> /usr/lib/libpython2.5.so.1.0(PyEval_EvalFrameEx+0x553d)[0x2b691a2cbf1d] >> /usr/lib/libpython2.5.so.1.0(PyEval_EvalFrameEx+0x6564)[0x2b691a2ccf44] >> /usr/lib/libpython2.5.so.1.0(PyEval_EvalCodeEx+0x836)[0x2b691a2cdb06] >> /usr/lib/libpython2.5.so.1.0[0x2b691a26dc5e] >> /usr/lib/libpython2.5.so.1.0(PyObject_Call+0x13)[0x2b691a24c323] >> /usr/lib/libpython2.5.so.1.0[0x2b691a253aad] >> /usr/lib/libpython2.5.so.1.0(PyObject_Call+0x13)[0x2b691a24c323] >> /usr/lib/libpython2.5.so.1.0[0x2b691a24c547] >> /usr/lib/libpython2.5.so.1.0(PyObject_CallMethod+0xc0)[0x2b691a24e610] >> /usr/lib/apache2/modules/mod_python.so[0x2b6919ff91bc] >> /usr/lib/apache2/modules/mod_python.so[0x2b6919ffb687] >> /usr/sbin/apache2(ap_run_handler+0x7a)[0x437c4a] >> /usr/sbin/apache2(ap_invoke_handler+0x7c)[0x43affc] >> /usr/sbin/apache2(ap_process_request+0x178)[0x447248] >> /usr/sbin/apache2[0x44468c] >> /usr/sbin/apache2(ap_run_process_connection+0x72)[0x43ec22] >> /usr/sbin/apache2[0x44b696] >> /lib/libpthread.so.0[0x2b6915a4d317] >> /lib/libc.so.6(clone+0x6d)[0x2b6915f39d5d] >> ======= Memory map: ======== >> [Fri Nov 28 02:52:57 2008] [notice] child pid 28387 exit signal Aborted (6) >> >> Seems to clearly point the finger at the mysql client library. >> >> Google shows a few similar looking cases, usually solved by removing >> PHP, which in this case is not installed. Nor is expat XML parser >> used. Nor mhash.so. :) >> >> The problem occurs on both Ubuntu 7.10, and 8.04 installs using the >> default packages for apache, python, mod python, mysql. From the 7.10 >> instance: >> >> luke at luke-ubuntu:~$ dpkg -l | grep mysql >> ii libdbd-mysql-perl 4.004-2 >> A Perl5 database interface to the MySQL data >> ii libmysqlclient15off 5.0.45-1ubuntu3.3 >> MySQL database client library >> ii mysql-client-5.0 5.0.45-1ubuntu3.3 >> MySQL database client binaries >> ii mysql-common 5.0.45-1ubuntu3.3 >> MySQL database common files >> ii mysql-server 5.0.45-1ubuntu3.3 >> MySQL database server (meta package dependin >> ii mysql-server-5.0 5.0.45-1ubuntu3.3 >> MySQL database server binaries >> ii python-mysqldb 1.2.2-3ubuntu1 >> A Python interface to MySQL >> >> luke at luke-ubuntu:~$ dpkg -l | grep mod-python >> ii libapache2-mod-python 3.3.1-2 >> Apache 2 module that embeds Python within th >> >> All running on Python 2.5. >> >> I'm thinking of getting the source and building the libmysqlclient >> myself now, but I'm hoping you've got some wise suggestions for me. >> >> Thanks very much for your time! >> >> Regards, >> >> Luke >> _______________________________________________ >> Mod_python mailing list >> Mod_python at modpython.org >> http://mailman.modpython.org/mailman/listinfo/mod_python >> > > ______________________________________________________________________ > This email has been scanned by the MessageLabs Email Security System. > For more information please visit http://www.messagelabs.com/email > ______________________________________________________________________ >
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