The following test failed in the JDK12 CI at tier3:

vmTestbase/metaspace/stressHierarchy/stressHierarchy012/TestDescription.java

Here is a snippet of the log file:

----------System.out:(10/369)----------
hierarchyType = MIXED
using TriggerUnloadingByFillingMetaspace
attemptsLimit = 50
unloadingPause = 1000
pausesLimit = 5
treeDepth=70, minLevelSize=10, maxLevelSize=100, hierarchyType=MIXED, triggerUnloadingHelper.getClass().getName()=vm.share.gc.TriggerUnloadingByFillingMetaspace
Create tree
Load classes and instantiate objects
Generating took 19 sec
cleanupLevel=69
----------System.err:(10/565)----------

Exception: java.lang.OutOfMemoryError thrown from the UncaughtExceptionHandler in thread "pool-1-thread-19"
java.lang.OutOfMemoryError: Metaspace
java.lang.OutOfMemoryError: Metaspace
java.lang.OutOfMemoryError: Metaspace
java.lang.OutOfMemoryError: Metaspace
STATUS:Failed.STATUS:Failed.STATUS:Failed.`main' threw exception: java.lang.OutOfMemoryError: Metaspace
`main' threw exception: java.lang.OutOfMemoryError: Metaspace
STATUS:Failed.`main' threw exception: java.lang.OutOfMemoryError: Metaspace
`main' threw exception: java.lang.OutOfMemoryError: Metaspace
----------rerun:(37/7296)*----------