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make sure there is always a master polling thread, by setting the "ctx_handler" field in the context. Else the reception of completion events can stop. This happens if event threads are created and destroyed during runtime. Found by: Ludovic Rousseau <ludovic.rousseau+freebsd@gmail.com> PR: 231742 MFC after: 1 week Approved by: re (kib) Sponsored by: Mellanox Technologies