The following test failed in the JDK21 CI:

java/io/Serializable/subclassGC/SubclassGC.java

Here's a snippet from the log file:

#section:main
----------messages:(6/250)----------
command: main SubclassGC
reason: User specified action: run main/othervm/policy=security.policy SubclassGC
started: Sat Dec 24 08:39:57 UTC 2022
Mode: othervm [/othervm specified]
finished: Sat Dec 24 08:39:59 UTC 2022
elapsed time (seconds): 1.774
----------configuration:(0/0)----------
----------System.out:(0/0)----------
----------System.err:(18/730)----------
WARNING: A command line option has enabled the Security Manager
WARNING: The Security Manager is deprecated and will be removed in a future release

 Regression test for bug 6232010


Start Garbage Collection right now
java.lang.Error
at SubclassGC.main(SubclassGC.java:82)
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: java.lang.Error
JavaTest Message: shutting down test

STATUS:Failed.`main' threw exception: java.lang.Error
----------rerun:(41/7287)*----------