Comment 3 for bug 1181146

This problem is caused by the follwoing bug in python-eventlet:

https://bitbucket.org/eventlet/eventlet/issue/149/yield-in-except-clause-with-wilcard-raise

A fix has been comitted but is waiting for the next release. There is a workaround already commonly used in Openstack:

nova.openstack.common.excutils.save_and_reraise_exception()

The number of except clauses that contain a yield should be minimal so it should not be necessary to path them all. Probably best to follow same path as other services i.e. use save_and_reraise_exception() and wait for eventlet patch to be released.