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cbe5bb235c
logging of login attempts happens in the background, because we don't want to block regular operation with disk since for such logging. however, when a line is logged, we evaluate some attributes of a connection, notably the username. but about when we do authentication, we change the username on a connection. so we were reading and writing at the same time. this is now fixed by evaluating the attributes before we pass off the logger to the goroutine. found by the go race detector.