I ran into this issue the other day on an internal project.  There are probably 
two errors.  One in Quantum and one in eventlet masking as a SQLAlchemy bug.

For the Quantum bug:

Try temporarily wrapping the code inside of the transaction in a try/except.  
In the except, call LOG.exception() and raise the exception again.  In you know 
how to trigger the bug even better, otherwise you'll have to wait until it 
bubbles up again.

The eventlet error is here:

https://bitbucket.org/eventlet/eventlet/issue/129/exception-info-clearing-is-problematic-and

mark

On Mar 7, 2013, at 7:34 PM, Aaron Rosen <[email protected]> wrote:

> Hey Guys,
> 
> I've been running into this exception every now and then the past day
> and was wondering if anyone had any ideas why?
> 
> http://codepad.org/Zpjj7U12
> 
> Thanks,
> 
> Aaron
> 
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