Even after JDK-8351002 we still see frequent failures:

java.lang.RuntimeException: getProcessCpuLoad() returns -1.0 which is not in the [0.0,1.0] interval
at GetProcessCpuLoad.main(GetProcessCpuLoad.java:49)
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104)
at java.base/java.lang.reflect.Method.invoke(Method.java:565)
at com.sun.javatest.regtest.agent.MainActionHelper$AgentVMRunnable.run(MainActionHelper.java:335)
at java.base/java.lang.Thread.run(Thread.java:1447)