The following test failed in the JDK20 CI:

runtime/ClassUnload/UnloadInterfaceTest.java

Here's a snippet from the log file:

#section:main
----------messages:(7/557)----------
command: main -Xbootclasspath/a:. -Xmn8m -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xlog:class+unload=trace UnloadInterfaceTest
reason: User specified action: run main/othervm -Xbootclasspath/a:. -Xmn8m -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xlog:class+unload=trace UnloadInterfaceTest
started: Thu Dec 22 12:27:08 GMT 2022
Mode: othervm [/othervm specified]
Additional options from @modules: --add-modules java.base --add-exports java.base/jdk.internal.misc=ALL-UNNAMED
finished: Thu Dec 22 12:27:09 GMT 2022
elapsed time (seconds): 0.837
----------configuration:(4/111)----------
Boot Layer
  add modules: java.base
  add exports: java.base/jdk.internal.misc ALL-UNNAMED

----------System.out:(1/38)----------
className found test.ImplementorClass
----------System.err:(13/904)----------
jdk.test.lib.classloader.ClassUnloadCommon$TestFailure: Test failed: should have been unloaded
at jdk.test.lib.classloader.ClassUnloadCommon.failIf(ClassUnloadCommon.java:51)
at UnloadInterfaceTest.run(UnloadInterfaceTest.java:90)
at UnloadInterfaceTest.main(UnloadInterfaceTest.java:69)
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104)
at java.base/java.lang.reflect.Method.invoke(Method.java:578)
at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:125)
at java.base/java.lang.Thread.run(Thread.java:1623)

JavaTest Message: Test threw exception: jdk.test.lib.classloader.ClassUnloadCommon$TestFailure: Test failed: should have been unloaded
JavaTest Message: shutting down test

STATUS:Failed.`main' threw exception: jdk.test.lib.classloader.ClassUnloadCommon$TestFailure: Test failed: should have been unloaded
----------rerun:(43/8811)*----------