The following test is failing the JDK16 CI:

gc/z/TestUncommit.java

Here's a snippet from the log file:

----------System.err:(14/849)----------
java.lang.Exception: Uncommitted too fast
at gc.z.TestUncommit.test(TestUncommit.java:110)
at gc.z.TestUncommit.main(TestUncommit.java:133)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:64)
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:832)

JavaTest Message: Test threw exception: java.lang.Exception: Uncommitted too fast
JavaTest Message: shutting down test

STATUS:Failed.`main' threw exception: java.lang.Exception: Uncommitted too fast
----------rerun:(54/5806)*----------

The fix for JDK-8248266 is included in jdk-16+13-499
so this bug is still happening.