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https://issues.apache.org/jira/browse/MODPYTHON-175?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Graham Dumpleton closed MODPYTHON-175.
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> PSP error page accessing session object can cause a deadlock.
> -------------------------------------------------------------
>
> Key: MODPYTHON-175
> URL: https://issues.apache.org/jira/browse/MODPYTHON-175
> Project: mod_python
> Issue Type: Bug
> Affects Versions: 3.2.8
> Reporter: Graham Dumpleton
> Assigned To: Graham Dumpleton
> Fix For: 3.3
>
>
> If a session object is required for a PSP page, the session object will be
> created automatically with the session being locked at the same time, when
> PSP.run() is called. If an error page is generated by the session page it in
> turn will then be run. The problem is that the session lock is still held by
> the main page and thus if the error page itself tries to also access the
> session object, when the PSP.run() method of the error page is called, it
> will create a new instance of the session object which will result in a
> deadlock.
> In MODPYTHON-38, the suggested change was that when PSP.run() creates the
> session object that it assign it back to req.session. This change was not
> made, but if it was then when the error page was run, it would simply have
> inherited the session object which had already been created by the main page
> and a deadlock would not have ensued.
> Thus could should read as:
> session = None
> if "session" in code.co_names:
> if hasattr(req, 'session'):
> session = req.session
> else:
> req.session = session = Session.Session(req)
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