segmentation fault when import flask

[jmsb...@gmail.com]

Hi,

Am using mod_wsgi 3.4 from source compiled with ./configure --with-python=/usr/local/ActivePython-2.7/bin/python

Apache is httpd-2.2.15-29.el6.centos.i686 on Centos 6.4

mod php loaded, but not mod python

Server version: Apache/2.2.15 (Unix)
Server built:   Aug 13 2013 17:27:11
Server's Module Magic Number: 20051115:25
Server loaded:  APR 1.3.9, APR-Util 1.3.9
Compiled using: APR 1.3.9, APR-Util 1.3.9
Architecture:   32-bit
Server MPM:     Prefork
  threaded:     no
    forked:     yes (variable process count)

ldd /usr/lib/httpd/modules/mod_wsgi.so
    linux-gate.so.1 =>  (0x00d7e000)
    libpthread.so.0 => /lib/libpthread.so.0 (0x00139000)
    libdl.so.2 => /lib/libdl.so.2 (0x00d79000)
    libutil.so.1 => /lib/libutil.so.1 (0x00154000)
    libm.so.6 => /lib/libm.so.6 (0x00df3000)
    libc.so.6 => /lib/libc.so.6 (0x0081b000)
    /lib/ld-linux.so.2 (0x007e4000)

WSGIPythonHome /usr/local/pythonenvs/ncthreatsenv
#WSGIPythonPath /usr/local/pythonenvs/ncthreatsenv/lib/python2.7/site-packages
WSGIScriptAlias /wps /var/www/wsgi/test/myapp.py
#WSGISocketPrefix /var/run/wsgi
#WSGIDaemonProcess ncthreats
#WSGIProcessGroup ncthreats
#WSGIScriptAlias /wps /var/www/wsgi/wps-server/wsgiscript.py

<Directory /var/www/wsgi>
Order allow,deny
Allow from all
</Directory>

The problem I am having is that the hello world in the quick configuration works, but if I add

from flask import Flask

I get no result and apache error logs like such:

[Wed Sep 25 13:05:07 2013] [info] [client 127.0.0.1] mod_wsgi (pid=15923, process='', application='::1|/wps'): Reloading WSGI script '/var/www/wsgi/test/myapp.py'.
[Wed Sep 25 13:05:07 2013] [notice] child pid 15923 exit signal Segmentation fault (11)
[Wed Sep 25 13:05:09 2013] [info] mod_wsgi (pid=15790): Create interpreter '::1|/wps'.
[Wed Sep 25 13:05:09 2013] [info] [client 127.0.0.1] mod_wsgi (pid=15790, process='', application='::1|/wps'): Loading WSGI script '/var/www/wsgi/test/myapp.py'.
[Wed Sep 25 13:05:09 2013] [notice] child pid 15790 exit signal Segmentation fault (11)
[Wed Sep 25 13:05:10 2013] [info] mod_wsgi (pid=15941): Python home /usr/local/pythonenvs/ncthreatsenv.
[Wed Sep 25 13:05:10 2013] [info] mod_wsgi (pid=15941): Initializing Python.
[Wed Sep 25 13:05:10 2013] [info] mod_wsgi (pid=15941): Attach interpreter ''.

Thanks,
Jim White

[Graham Dumpleton]

Try setting:

WSGIApplicationGroup %{GLOBAL}

For reasons why, see:

http://code.google.com/p/modwsgi/wiki/ApplicationIssues#Python_Simplified_GIL_State_API

http://code.google.com/p/modwsgi/wiki/FrequentlyAskedQuestions#Apache_Process_Crashes

If stil, no joy, have a look at the page linked there about expat issues as that seems to be cropping up a bit lately. It may be necessary if it is the expect issue to rebuild Python and tell it not to use the system expat library but the namespace prefixed one bundled with Python.

Graham

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