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                                            Markus Jerger

Process hang while executing logging.warning under specific circumstances

I ran into the same problem with one of my own packages last week. Ultimately, this appears to be caused by Python's import lock causing a deadlock when ipkernel.iostream.OutStream.flush is...

Process hang while executing logging.warning under specific circumstances

Unfortunately, I see the same behavior with ipykernel 4.5.2 (other versions are jupyter_client 4.4.0, jupyter_core 4.2.1, notebook 4.3.1). [Trace of pub_thread](https://github.com/jupyter/jupyter/files/695365/trace_pub_thread.txt)