dbKillCursors op asserts on mongos when at log level 3

Start a 2.6.8 sharded cluster Raise the mongos log level to 3 Execute the following Python script against mongos from pymongo import MongoClient     client = MongoClient("localhost:27017" ) db = client.test   for x in range(0, 20): db.test.save({'x': x})   cursor = db.test.find({'x': {'$gte': 1}}).batch_size(5)   for item in cursor: break   cursor.close()