I've worked around the problem by removing the `global` statement that was unneeded anyway. I'll let you know if it crops up again.
Thanks! On Thu, Dec 18, 2014 at 3:16 PM, Graham Dumpleton < [email protected]> wrote: > > I am going to assume it is that. Best I have right now. :-) > > Graham > > On 19/12/2014, at 7:14 AM, Jason Garber <[email protected]> wrote: > > Hi Graham, > > I read that but did not realize it was the problem. I've asked IUS to > upgrade to 4.4.2. > > Thanks! > > On Thu, Dec 18, 2014 at 3:07 PM, Graham Dumpleton < > [email protected]> wrote: >> >> 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. >> > > -- > 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. > -- 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.
