@drewhk I would like to discuss this failure with you. The reason why it is not always failing (we have not seen a single failure on the servers) is that the Terminated message was eaten up by the above awaitAssert.

The test was originally written so that we didn't expect to receive Terminated for the subject (of the old system) because of blackhole, and long FD. Now it is triggered, which is not wrong, but I'm curious what triggers it. Could it be the new incoming connection from the new system with same host:port different uid?