Benedikt Sauer added the comment:
Actually I think that this may consist of multiple issues:
1. http://bugs.python.org/issue8323 (closed as wont-fix): multiprocessing.Queue
should throw a sensible error if a Queue element can't be unpickled, however
the user managed to create that
2
New submission from Benedikt Sauer:
When raising an exception that is unpicklable in a worker process. This used to
be the case for all exceptions that have a non-trivial constructor but this was
fixed by http://bugs.python.org/issue1692335.
I now have the concrete problem with cx_Oracle in
