An exception

java.util.ConcurrentModificationException
at java.base/java.util.HashMap.computeIfAbsent(HashMap.java:1229)
at com.sun.javatest.regtest.report.SummaryReporter.forTestNG(SummaryReporter.java:61)
at com.sun.javatest.regtest.exec.RegressionScript.getTestNGSummaryReporter(RegressionScript.java:1100)
at com.sun.javatest.regtest.exec.TestNGAction.endAction(TestNGAction.java:174)
at com.sun.javatest.regtest.exec.MainAction.run(MainAction.java:361)
at com.sun.javatest.regtest.exec.RegressionScript.run(RegressionScript.java:275)
at com.sun.javatest.Script.run(Script.java:431)
at com.sun.javatest.DefaultTestRunner.runTest(DefaultTestRunner.java:183)
at com.sun.javatest.DefaultTestRunner$1.run(DefaultTestRunner.java:76)

leads to a couple of JDK tests to fail in "error".