Hi Graham, We were upgraded to python33-mod_wsgi-4.4.0-1.ius.el6.x86_64 this morning and started getting strange errors on a major production site.
The message in the log was about Truncated or oversized response headers. But upon further looking - it looks like a Segmentation Fault is being emitted to the main apache error log. Here was the upgrade: Dec 18 03:27:39 Updated: python33-mod_wsgi-4.4.0-1.ius.el6.x86_64 Here was the downgrade: Dec 18 10:46:56 Installed: python33-mod_wsgi-4.3.2-1.ius.el6.x86_64 After the downgrade, the segfaults stopped happening. I traced it down to a `global` statement: def parse_form_data(self): global Log #SEGFAULT CAUSED HERE [image: Inline image 1] This would only happen every few requests. So the question comes down to: 1. Is mod_wsgi built against the current python version? (Asking IUS that...) 2. Why would `global Log` ever cause a segfault? 3. Why would it cause a segfault in 4.4.0 but not in 4.3.2 Thanks for your help Graham, Jason -------------------------------- *Apache Log Example:* [Thu Dec 18 12:08:47 2014] [error] [client 192.168.50.235] ExtendedRequest:Start:/User/API/ShockBox/ [Thu Dec 18 12:08:47 2014] [notice] child pid 27348 exit signal Segmentation fault (11) [Thu Dec 18 12:08:47 2014] [error] [client 192.168.50.235] Truncated or oversized response headers received from daemon process 'Port60011': /home/jason/DevLevel.2/AMSTMT/Web/Dashboard/User/index.wsgi, referer: https://dashboard--technologymarketingtoolkit--com--jason.step.appcove.net/User/ShockBox/ Note: no ExtendedRequest:End log message here as would be expected, just before start_response() is called and an iterator is returned. So the request is being terminated *Software Stack:* Red Hat Enterprise Linux Server release 6.6 (Santiago) httpd-2.2.15-39.0.1.el6.x86_64 python33-mod_wsgi-4.4.0-1.ius.el6.x86_64 python33-3.3.6-1.ius.el6.x86_64 *HTTP Config* <IfModule !python_module> <IfModule !wsgi_module> LoadModule wsgi_module modules/python33-mod_wsgi.so WSGISocketPrefix run/wsgi WSGIApplicationGroup %{GLOBAL} </IfModule> </IfModule> WSGIDaemonProcess Port60011 processes=2 threads=2 python-path=/home/jason/DevLevel.2/AMSTMT/Python socket-timeout=600 Listen 127.0.0.1:60011 NameVirtualHost 127.0.0.1:60011 # dashboard--technologymarketingtoolkit--com--jason.step.appcove.net <VirtualHost 127.0.0.1:60011> ServerName _default_; DocumentRoot /home/jason/DevLevel.2/AMSTMT/Web/Dashboard AddDefaultCharset UTF-8 RewriteEngine on RewriteOptions inherit # Forbid any python source files from being served. RewriteRule \.(py|pyc|pyo|wsgi)$ - [F] # To handle content views RewriteRule ^/User/Content/([a-zA-Z0-9]+)$ /User/Content/Index?C=$1 [PT,L] # WSGI Settings WSGIScriptAlias /CCRM /home/jason/DevLevel.2/AMSTMT/Web/Dashboard/CCRM/index.wsgi WSGIScriptAlias /ShockBox /home/jason/DevLevel.2/AMSTMT/Web/Dashboard/ShockBox/index.wsgi WSGIScriptAlias /User /home/jason/DevLevel.2/AMSTMT/Web/Dashboard/User/index.wsgi WSGIScriptAlias /Integration /home/jason/DevLevel.2/AMSTMT/Web/Dashboard/Integration/index.wsgi WSGIScriptAlias / /home/jason/DevLevel.2/AMSTMT/Web/Dashboard/index.wsgi WSGIProcessGroup Port60011 LogLevel info ErrorLog /home/jason/DevLevel.2/AMSTMT/apache-error.log </VirtualHost> -- You received this message because you are subscribed to the Google Groups "modwsgi" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/modwsgi. For more options, visit https://groups.google.com/d/optout.
