Unfortunately the MultiNSTParallel.java test fails 1-2 times per week on some of our Linux ppc64le test machines with errors like these :

java.lang.Exception: java.lang.RuntimeException: 'MultiNST PSK' missing from stderr
at MultiNSTParallel.main(MultiNSTParallel.java:154)
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.MainWrapper$MainTask.run(MainWrapper.java:138)
at java.base/java.lang.Thread.run(Thread.java:1447)
Caused by: java.lang.RuntimeException: 'MultiNST PSK' missing from stderr
at jdk.test.lib.process.OutputAnalyzer.stderrShouldContain(OutputAnalyzer.java:283)
at MultiNSTParallel.main(MultiNSTParallel.java:123)
... 4 more

I add a longer log part of a failing test to this JBS issue .