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From "Jarkko (JIRA)" <j...@apache.org>
Subject [jira] Created: (MODPYTHON-31) mod_python - session stopped working after infinite loop was killed
Date Thu, 10 Mar 2005 14:05:52 GMT
mod_python - session stopped working after infinite loop was killed

         Key: MODPYTHON-31
         URL: http://issues.apache.org/jira/browse/MODPYTHON-31
     Project: mod_python
        Type: Bug
  Components: core  
    Versions: 3.1.3    
 Environment: Using Fedora Core 3.

# rpm -q httpd

# rpm -q mod_python
    Reporter: Jarkko
    Priority: Blocker

# Add .psp to types
AddType application/x-httpd-psp .psp

# Handle .psp documents with mod_python
AddHandler mod_python .psp
PythonHandler mod_python.psp

# Add index.psp to index documents
DirectoryIndex index.psp

# Enable debug under /psp directory
<Directory /var/www/html/psp>
AddHandler mod_python .psp_
PythonDebug On


sid: <%=session.id()%>


lynx localhost/psp
Mod_python error: "PythonHandler mod_python.psp"

Traceback (most recent call last):

  File "/usr/lib/python2.3/site-packages/mod_python/apache.py", line 299, in 
    result = object(req)

  File "/usr/lib/python2.3/site-packages/mod_python/psp.py", line 297, in 

  File "/usr/lib/python2.3/site-packages/mod_python/psp.py", line 191, in run
    session = Session.Session(req)

  File "/usr/lib/python2.3/site-packages/mod_python/Session.py", line 389, in 
    timeout=timeout, lock=lock)

  File "/usr/lib/python2.3/site-packages/mod_python/Session.py", line 294, in 
    timeout=timeout, lock=lock)

  File "/usr/lib/python2.3/site-packages/mod_python/Session.py", line 132, in 
    Cookie.add_cookie(self._req, self.make_cookie())

  File "/usr/lib/python2.3/site-packages/mod_python/Session.py", line 160, in 
    c.path = dirpath[len(docroot):]

TypeError: unsubscriptable object

First the page worked like a charm. But then I figured I'd like to see how 
mod_python handles a situation where the page has an infinite loop in it.

I coded a page with a code like "while True:" etc. in it and ran it. (The code 
had a call to session too, so session was initialized.) I noticed that the 
script was newer killed (this is bad, PHP handles this with its time limit). I 
had to restart httpd then (which killed the script).

Now after that loop test the session variable does not work anymore. I get 
that "unsubscriptable object" error message.

I figured that maybe the session data is corrupted and deleted the dbm file 
from /tmp. That did not help. I've also restarted httpd multiple times.

The weirdest thing about this is that the httpd is preforked, so the session 
should exists only in memory. If the session exists only in memory, restarting 
httpd should be enough.

Where can that corrupted session data be stored now? Does httpd save its state 
into some files? Even rebooting the whole machine did not help.

I consider this bug a very serious thing because this is a blocker. Sessions 
don't work anymore.

Also, some kind of handling for infinite loops should be implemented. Yes I 
know, that should be described in another bug report, but let's fix this 
session thing first.

I have high hopes for mod_python as it integrates an excellent language to an 
excellent web server and because it enables a powerfull and easy alternative to 

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