The following test is failing in the JDK13 CI:

serviceability/jvmti/HeapMonitor/MyPackage/HeapMonitorMultiArrayTest.java

Here's a snippet of the .jtr file:

----------System.err:(13/920)----------
java.lang.RuntimeException: Number of samples (6006) not the expected (6000)
at MyPackage.HeapMonitorMultiArrayTest.main(HeapMonitorMultiArrayTest.java:55)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:567)
at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:127)
at java.base/java.lang.Thread.run(Thread.java:835)

JavaTest Message: Test threw exception: java.lang.RuntimeException: Number of samples (6006) not the expected (6000)
JavaTest Message: shutting down test

STATUS:Failed.`main' threw exception: java.lang.RuntimeException: Number of samples (6006) not the expected (6000)
----------rerun:(46/5329)*----------

The JDK13 CI failures that I've seen are all on SPARC.
There are other failures in Mach5, but they are not in CI tasks.