Dereference ref_dict causes hang

[tbenst]

I've traced a hang when using Pytorch to this line:

https://github.com/Yelp/bravado-core/blob/ac5e46d618d4f7720f79eba02edad221a50047e1/bravado_core/spec.py#L407

The full trace is here: https://gist.github.com/tbenst/2b6ef453b37f634f32d856bbdceed71e

Any idea what might be causing this, or how I could troubleshoot?

[macisamuele]

Having more details on how to reproduce the issue could help us more in providing support. Checking the stacktrace nothing specific rings a bell