As a result of some other infrastructure failures, I'm seeing stack
traces like the one below for some failed jtreg tests. Note the
security exception: System.exit() forbidden by JT Harness.

Agent[5].stderr: Exception in thread "main" java.lang.SecurityException: System.exit() forbidden by JT Harness
Agent[5].stderr: at com.sun.javatest.JavaTestSecurityManager.checkExit(JavaTestSecurityManager.java:117)
Agent[5].stderr: at java.lang.Runtime.exit(java.base@9-internal/Runtime.java:120)
Agent[5].stderr: at java.lang.System.exit(java.base@9-internal/System.java:1666)
Agent[5].stderr: at com.sun.javatest.regtest.agent.AgentServer.main(AgentServer.java:62)