Hmmm, `TimeoutEnabledChannelPipelineFactory` is using it, and you've made no change to add `stop()` to it, and it shows as already overriding stop (https://github.com/tristantarrant/infinispan/blob/df09c463ab914522d1d8fad68ff3042bf3c88c89/server/core/src/main/scala/org/infinispan/server/core/transport/TimeoutEnabledChannelPipelineFactory.scala#L49), which stop was it overriding until now?