The following test timed out in the JDK21 CI:

javax/management/remote/mandatory/loading/RMIDownloadTest.java

Here's a snippet from the log file:

#section:main
----------messages:(9/468)----------
command: main -Djava.security.manager=allow RMIDownloadTest send without
reason: User specified action: run main/othervm -Djava.security.manager=allow RMIDownloadTest send without 
started: Thu May 18 08:39:45 UTC 2023
Mode: othervm [/othervm specified]
Additional options from @modules: --add-modules java.management,java.management.rmi
Timeout information:
--- Timeout information end.
finished: Thu May 18 08:51:06 UTC 2023
elapsed time (seconds): 680.897
----------configuration:(3/66)----------
Boot Layer
  add modules: java.management java.management.rmi

----------System.out:(4/138)----------
Testing we can send an object from client to server
Testing without codebase, should fail
Sending object...
Timeout refired 480 times
----------System.err:(6/611)----------
WARNING: A terminally deprecated method in java.lang.System has been called
WARNING: System::setSecurityManager has been called by RMIDownloadTest (file:/C:/sb/prod/1684398797/testoutput/test-support/jtreg_open_test_jdk_jdk_jmx/classes/4/javax/management/remote/mandatory/loading/RMIDownloadTest.d/)
WARNING: Please consider reporting this to the maintainers of RMIDownloadTest
WARNING: System::setSecurityManager will be removed in a future release
May 18, 2023 8:39:48 AM javax.management.remote.rmi.RMIConnectionImpl unwrap
WARNING: Failed to unmarshall object: java.lang.ClassNotFoundException: Zooby
----------rerun:(49/5972)*----------

<snip>

result: Error. Program `c:\ade\mesos\work_dir\jib-master\install\jdk-21+23-1993\windows-x64-debug.jdk\jdk-21\fastdebug\bin\java' timed out (timeout set to 480000ms, elapsed time including timeout handling was 680881ms).