gc/z/TestGarbageCollectorMXBean.java failing in loom repo

loom repo, tier4

:
[12.887s] (Notification Thread) ZGC Pauses (com.sun.management.gc.notification)
[12.887s] (Notification Thread) Id: 34
[12.887s] (Notification Thread) Action: end of GC pause
[12.887s] (Notification Thread) Cause: CodeCache GC Threshold
[12.887s] (Notification Thread) StartTime: 31643
[12.887s] (Notification Thread) EndTime: 31643
[12.887s] (Notification Thread) Duration: 0
[12.887s] (Notification Thread) MemoryUsageBeforeGC: init = 0(0K) used = 0(0K) committed = 0(0K) max = 0(0K)
[12.887s] (Notification Thread) MemoryUsageAfterGC: init = 0(0K) used = 0(0K) committed = 0(0K) max = 0(0K)
[12.887s] (Notification Thread)
[12.887s] (Notification Thread) ERROR: Cause
:


----------System.err:(11/613)----------
java.lang.Exception: Unexpected errors
at TestGarbageCollectorMXBean.main(TestGarbageCollectorMXBean.java:215)
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104)
at java.base/java.lang.reflect.Method.invoke(Method.java:577)
at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:127)
at java.base/java.lang.Thread.run(Thread.java:1493)

JavaTest Message: Test threw exception: java.lang.Exception: Unexpected errors
JavaTest Message: shutting down test