The following test failed in the JDK16 CI:

applications/jcstress/seqcst.java

Here's a snippet from the log file:

----- [OK] Unlocking diagnostic VM options
Burning up to figure out the exact CPU count....... done!

----- [OK] Trimming down the default VM heap size to 1/8-th of max RAM
----- [OK] Trimming down the number of compiler threads
----- [OK] Trimming down the number of parallel GC threads
----- [OK] Trimming down the number of concurrent GC threads
----- [OK] Trimming down the number of G1 concurrent refinement GC threads
----- [FAILED] Testing @Contended works on all results and infra objects
Java HotSpot(TM) 64-Bit Server VM warning: Option MaxRAMFraction was deprecated in version 10.0 and will likely be removed in a future release.
Java HotSpot(TM) 64-Bit Server VM warning: Option MinRAMFraction was deprecated in version 10.0 and will likely be removed in a future release.
Exception in thread "main" java.lang.IllegalStateException: /opt/mach5/mesos/work_dir/slaves/983c483a-6907-44e0-ad29-98c7183575e2-S154452/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/d8d1d317-a8a1-472d-8f96-de05b7474bbc/runs/8509417c-55e7-42e2-ba5a-f64cc65beb01/testoutput/test-support/jtreg_open_test_hotspot_jtreg_jcstress_part1/classes/0/applications/jcstress/seqcst/d/applications/jcstress/JcstressRunner
at org.openjdk.jcstress.util.Reflections.getClasses(Reflections.java:66)
at org.openjdk.jcstress.vm.ContendedTestMain.main(ContendedTestMain.java:43)
Caused by: java.lang.ClassNotFoundException: /opt/mach5/mesos/work_dir/slaves/983c483a-6907-44e0-ad29-98c7183575e2-S154452/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/d8d1d317-a8a1-472d-8f96-de05b7474bbc/runs/8509417c-55e7-42e2-ba5a-f64cc65beb01/testoutput/test-support/jtreg_open_test_hotspot_jtreg_jcstress_part1/classes/0/applications/jcstress/seqcst/d/applications/jcstress/JcstressRunner
at java.base/java.lang.Class.forName0(Native Method)
at java.base/java.lang.Class.forName(Class.java:466)
at org.openjdk.jcstress.util.Reflections.getClasses(Reflections.java:64)
... 1 more

This test ran for almost three hours, but it's not clear when
the above exceptions were thrown. This failure might be due
to test bug in applications/jcstress/seqcst.java or in the harness
so I'm starting this bug off in hotspot/test.