This test was problemlisted as part of JDK-8373023, which lowered the default size of the java heap, resulting in earlier GC's that can affect some tests. In this case a debuggee object was unexpectedly collect resulting in an ObjectCollectedException:

[JDI: EventSet: SUSPEND_NONE]
[JDI: Looking up Class, signature='Ljdk/internal/event/VirtualThreadEndEvent;', id=231]
[JDI: Sending Command(id=443) JDWP.ThreadReference.Name]
[JDI: Sending: thread(ThreadReferenceImpl): ref=151]
[1080ms] FAILED: Exception occured in eventHandler: com.sun.jdi.ObjectCollectedException
at java.base/java.lang.Thread.getStackTrace(Thread.java:2220)
at TestScaffold.failure(TestScaffold.java:498)
at TestScaffold$EventHandler.run(TestScaffold.java:305)
at java.base/java.lang.Thread.run(Thread.java:1516)
com.sun.jdi.ObjectCollectedException
at jdk.jdi/com.sun.tools.jdi.JDWPException.toJDIException(JDWPException.java:56)
at jdk.jdi/com.sun.tools.jdi.ThreadReferenceImpl.name(ThreadReferenceImpl.java:197)
at jdk.jdi/com.sun.tools.jdi.EventSetImpl$ThreadedEventImpl.toString(EventSetImpl.java:223)
at java.base/java.lang.String.valueOf(String.java:4817)
at jdk.jdi/com.sun.tools.jdi.EventSetImpl.build(EventSetImpl.java:669)
at jdk.jdi/com.sun.tools.jdi.EventQueueImpl.removeUnfiltered(EventQueueImpl.java:212)
at jdk.jdi/com.sun.tools.jdi.EventQueueImpl.removeInternal(EventQueueImpl.java:125)
at jdk.jdi/com.sun.tools.jdi.InternalEventHandler.run(InternalEventHandler.java:61)
at java.base/java.lang.Thread.run(Thread.java:1516)
com.sun.jdi.ObjectCollectedException
at jdk.jdi/com.sun.tools.jdi.JDWPException.toJDIException(JDWPException.java:56)
at jdk.jdi/com.sun.tools.jdi.ThreadReferenceImpl.name(ThreadReferenceImpl.java:197)
at jdk.jdi/com.sun.tools.jdi.EventSetImpl$ThreadedEventImpl.toString(EventSetImpl.java:223)
at java.base/java.lang.String.valueOf(String.java:4817)
at jdk.jdi/com.sun.tools.jdi.EventSetImpl.build(EventSetImpl.java:669)
at jdk.jdi/com.sun.tools.jdi.EventQueueImpl.removeUnfiltered(EventQueueImpl.java:212)
at jdk.jdi/com.sun.tools.jdi.EventQueueImpl.remove(EventQueueImpl.java:97)
at jdk.jdi/com.sun.tools.jdi.EventQueueImpl.remove(EventQueueImpl.java:83)
at TestScaffold$EventHandler.run(TestScaffold.java:260)
at java.base/java.lang.Thread.run(Thread.java:1516)