It was fixed in 4.4.1. http://modwsgi.readthedocs.org/en/master/release-notes/version-4.4.1.html
""" 1. Process crashes could occur when request content had been consumed by the WSGI application. The trigger was when the Python wsgi.input was still in existence after the web request had finished. The destruction of the wsgi.input object was accessing memory which had already been released back to the Apache memory pools and potentially reused. This could cause crashes or other unexplained behaviour. This issue was introduced in version 4.4.0 of mod_wsgi. """ The latest is 4.4.2. I would have to dig back through email to try and see if I can find details of the maintainer of the IUS packages, but if you know how to notify them and point out the newer version that fixes the problem that would be great, Graham On 19/12/2014, at 6:32 AM, Jason Garber <[email protected]> wrote: > 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.png> > > 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. -- 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.
