ius-coredev team mailing list archive

[Carl George <carl.george@xxxxxxxxxxxxx>]

What version of EL are you on?
What packages are installed in your virtualenv (pip freeze)?
Is mod_python installed (system or virtualenv)?
What is the contents of /etc/httpd/conf.d/python27-mod_wsgi.conf (or any other relevant httpd config file)?

The second answer from that section of the FAQs specifically mentions expat:
 
> This is nearly always caused due to a shared library version conflict. That is,
> Apache or some Apache module is linked against a different version of a
> library than that which is being used by a particular Python module that the
> WSGI application makes use of. The most common culprits are the expat and
> MySQL libraries, but it can also occur with other shared libraries.

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https://bugs.launchpad.net/bugs/1341325

Title:
  python27-mod_wsgi crashes when loaded by apache

Status in IUS Community Project:
  New

Bug description:
  I've been running python27-mod_wsgi 4.2.4 with apache 2.2.3 to host a
  Django app running within a virtualenv with no problems for some time
  now but recently it has started to segfault constantly when trying to
  load the python interpreter with a message like: child pid 12574 exit
  signal Segmentation fault (11).

  I dumped the core and extracted the following from gdb but am at a
  loss at this point. I've read through
  https://code.google.com/p/modwsgi/wiki/FrequentlyAskedQuestions#Apache_Process_Crashes
  but haven't had any success applying those fixes yet - httpd is loaded
  with expat 1.95.8 and my virtualenv python is running 2.0.1 but I
  didn't encounter a segfault when running:

  (in-virtualenv) % LD_PRELOAD=/lib64/libexpat.so.0 python
  Python 2.7.7 (default, Jun  4 2014, 17:09:35) 
  [GCC 4.4.7 20120313 (Red Hat 4.4.7-1)] on linux2
  Type "help", "copyright", "credits" or "license" for more information.
  >>> import pyexpat
  >>> pyexpat.version_info
  (1, 95, 8)
  >>> 

  Results of gdb /usr/sbin/httpd /path/to/core.dump:

  warning: no loadable sections found in added symbol-file system-supplied DSO at 0x7fff1dffd000
  Core was generated by `/usr/sbin/httpd'.
  Program terminated with signal 11, Segmentation fault.
  #0  0x00002aed3f67ef40 in strlen () from /lib64/libc.so.6
  (gdb) where
  #0  0x00002aed3f67ef40 in strlen () from /lib64/libc.so.6
  #1  0x00002aed4a24e43b in PyString_FromString () from /usr/lib64/libpython2.7.so.1.0
  #2  0x00002aed49f8124b in ?? ()
  #3  0x00002aed00005168 in ?? ()
  #4  0x00002aed49f97190 in ?? ()
  #5  0x00002aed4a552e00 in ?? () from /usr/lib64/libpython2.7.so.1.0
  #6  0x00000000ffffffff in ?? ()
  #7  0x00002aed49f97190 in ?? ()
  #8  0x00002aed3d826cf0 in ?? ()
  #9  0x00002aed4a1a0b98 in ?? ()
  #10 0x0000000000000001 in ?? ()
  #11 0x00002aed3d826cf0 in ?? ()
  #12 0x0000000000000000 in ?? ()
  (gdb) 

  # httpd -V
  Server version: Apache/2.2.3
  Server built:   Mar 26 2014 08:47:55
  Server's Module Magic Number: 20051115:3
  Server loaded:  APR 1.5.0, APR-Util 1.5.3
  Compiled using: APR 1.2.7, APR-Util 1.2.7
  Architecture:   64-bit
  Server MPM:     Prefork
    threaded:     no
      forked:     yes (variable process count)
  Server compiled with....
   -D APACHE_MPM_DIR="server/mpm/prefork"
   -D APR_HAS_SENDFILE
   -D APR_HAS_MMAP
   -D APR_HAVE_IPV6 (IPv4-mapped addresses enabled)
   -D APR_USE_SYSVSEM_SERIALIZE
   -D APR_USE_PTHREAD_SERIALIZE
   -D SINGLE_LISTEN_UNSERIALIZED_ACCEPT
   -D APR_HAS_OTHER_CHILD
   -D AP_HAVE_RELIABLE_PIPED_LOGS
   -D DYNAMIC_MODULE_LIMIT=128
   -D HTTPD_ROOT="/etc/httpd"
   -D SUEXEC_BIN="/usr/sbin/suexec"
   -D DEFAULT_PIDLOG="run/httpd.pid"
   -D DEFAULT_SCOREBOARD="logs/apache_runtime_status"
   -D DEFAULT_LOCKFILE="logs/accept.lock"
   -D DEFAULT_ERRORLOG="logs/error_log"
   -D AP_TYPES_CONFIG_FILE="conf/mime.types"
   -D SERVER_CONFIG_FILE="conf/httpd.conf"

  Please let me know if you need any additional information, and I'd
  appreciate any thoughts as to why this might be happening..

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