This is a reduced test case of when Netty, Java 8 lambdas, Java agents, and Windows meet to have a crash.
Clone the repo, and then execute on any java 8 version prior to 8u40:
$ gradlew.bat agentJar
$ java -javaagent:build/libs/agent.jar -jar build/libs/agent.jar
A sample error report is available in this repo.