You nailed it down damn straight! For some reason mod_wsgi was indead 
configured to use threads instead of processes. Thanks a lot for the heads 
up!

пятница, 12 июля 2013 г., 17:40:37 UTC+3 пользователь Michael Bayer написал:
>
>
> 2. you have concurrent access to the session such that one thread is 
> calling upon session.commit() while another is calling upon a query.   I 
> know you said that your mod_wsgi is configured for "single thread", but the 
> pattern in which the error occurs here (very non-deterministically) 
> strongly suggests there are is in fact more than one thread occurring.
>
>
>

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