The following test failed in the JDK14 CI:

vmTestbase/metaspace/gc/watermark_0_1/TestDescription.java

Here's a snippet from the log file:

%%% Working with Metaspace
% -XX:MaxMetaspaceFreeRatio=1
% -XX:MetaspaceSize=5m
% -XX:MaxMetaspaceSize=25m
% -XX:-UseCompressedOops
% -Dtest.java.opts=-server -XX:+UnlockExperimentalVMOptions -XX:+UseZGC -XX:+CreateCoredumpOnCrash -XX:-UseCompressedOops
% -XX:MinMetaspaceFreeRatio=0
% Classes loaded: 2160
% Used metaspace : 14302k
% Committed metaspce: 15412k
% GC has been invoked: 11 times
----------System.err:(16/1146)----------
metaspace.gc.Fault: GC has happened too rare: 11 times, expected count greater than 20
at metaspace.gc.HighWaterMarkTest.checkGCCount(HighWaterMarkTest.java:225)
at metaspace.gc.HighWaterMarkTest.doCheck(HighWaterMarkTest.java:193)
at metaspace.gc.MetaspaceBaseGC.run(MetaspaceBaseGC.java:97)
at metaspace.gc.HighWaterMarkTest.main(HighWaterMarkTest.java:69)
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:564)
at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:127)
at java.base/java.lang.Thread.run(Thread.java:830)

JavaTest Message: Test threw exception: metaspace.gc.Fault: GC has happened too rare: 11 times, expected count greater than 20
JavaTest Message: shutting down test

STATUS:Failed.`main' threw exception: metaspace.gc.Fault: GC has happened too rare: 11 times, expected count greater than 20
----------rerun:(49/7349)*----------