The following test failed in the JDK20 CI:

runtime/ClassUnload/UnloadTest.java

Here's a snippet from the log file:

#section:main
----------messages:(7/540)----------
command: main -Xbootclasspath/a:. -Xmn8m -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xlog:class+unload=debug UnloadTest
reason: User specified action: run main/othervm -Xbootclasspath/a:. -Xmn8m -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xlog:class+unload=debug UnloadTest
started: Mon Nov 28 19:58:35 UTC 2022
Mode: othervm [/othervm specified]
Additional options from @modules: --add-modules java.base --add-exports java.base/jdk.internal.misc=ALL-UNNAMED
finished: Mon Nov 28 19:59:02 UTC 2022
elapsed time (seconds): 26.706
----------configuration:(4/111)----------
Boot Layer
  add modules: java.base
  add exports: java.base/jdk.internal.misc ALL-UNNAMED

----------System.out:(11/1164)----------
Refcount of symbol ClassUnloadCommonClassLoader is 3
[26.028s][info][class,unload] unloading class java.lang.invoke.LambdaForm$MH/0x0000000801008800 0x0000000801008800
[26.028s][info][class,unload] unloading class java.lang.invoke.LambdaForm$MH/0x0000000801007c00 0x0000000801007c00
[26.028s][info][class,unload] unloading class java.lang.invoke.LambdaForm$MH/0x0000000801007800 0x0000000801007800
[26.028s][info][class,unload] unloading class java.lang.invoke.LambdaForm$MH/0x0000000801007400 0x0000000801007400
[26.028s][info][class,unload] unloading class java.lang.invoke.LambdaForm$MH/0x0000000801006800 0x0000000801006800
[26.028s][info][class,unload] unloading class java.lang.invoke.LambdaForm$MH/0x0000000801005800 0x0000000801005800
[26.028s][info][class,unload] unloading class test.Empty 0x0000000801005000
[26.028s][info][class,unload] unloading class java.lang.invoke.LambdaForm$MH/0x0000000801003000 0x0000000801003000
[26.028s][info][class,unload] unloading class java.lang.invoke.LambdaForm$MH/0x0000000801002800 0x0000000801002800
[26.028s][info][class,unload] unloading class java.lang.invoke.LambdaForm$MH/0x0000000801000800 0x0000000801000800
----------System.err:(13/876)----------
jdk.test.lib.classloader.ClassUnloadCommon$TestFailure: Test failed: should still be live
at jdk.test.lib.classloader.ClassUnloadCommon.failIf(ClassUnloadCommon.java:51)
at UnloadTest.test_unload_instance_klass(UnloadTest.java:75)
at UnloadTest.main(UnloadTest.java:53)
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:1591)

JavaTest Message: Test threw exception: jdk.test.lib.classloader.ClassUnloadCommon$TestFailure: Test failed: should still be live
JavaTest Message: shutting down test

STATUS:Failed.`main' threw exception: jdk.test.lib.classloader.ClassUnloadCommon$TestFailure: Test failed: should still be live
----------rerun:(50/8569)*----------