The following test failed in the JDK21 CI:

sun/tools/jstatd/TestJstatdPort.java

Here's a snippet from the log file:

Start jstatd:
[/opt/mach5/mesos/work_dir/jib-master/install/jdk-21+22-1835/linux-aarch64-debug.jdk/jdk-21/fastdebug/bin/jstatd -J-Xmx768m -J-XX:MaxRAMPercentage=6.25 -J-Dtest.boot.jdk=/opt/mach5/mesos/work_dir/jib-master/install/jdk/20/36/bundles/linux-aarch64/jdk-20_linux-aarch64_bin.tar.gz/jdk-20 -J-Djava.io.tmpdir=/opt/mach5/mesos/work_dir/slaves/741e9afd-8c02-45c3-b2e2-9db1450d0832-S43805/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/f4f88088-b6c0-4f73-ba48-440a22a071a4/runs/e89910ef-603b-4c20-ba34-307ad4b86e3d/testoutput/test-support/jtreg_open_test_jdk_jdk_svc/tmp -J-ea -J-esa -J-ea -J-esa -J-XX:-UseNotificationThread -J-XX:+UsePerfData -p43873]
[Jstatd-Thread]:/opt/mach5/mesos/work_dir/jib-master/install/jdk-21+22-1835/linux-aarch64-debug.jdk/jdk-21/fastdebug/bin/jstatd -J-Xmx768m -J-XX:MaxRAMPercentage=6.25 -J-Dtest.boot.jdk=/opt/mach5/mesos/work_dir/jib-master/install/jdk/20/36/bundles/linux-aarch64/jdk-20_linux-aarch64_bin.tar.gz/jdk-20 -J-Djava.io.tmpdir=/opt/mach5/mesos/work_dir/slaves/741e9afd-8c02-45c3-b2e2-9db1450d0832-S43805/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/f4f88088-b6c0-4f73-ba48-440a22a071a4/runs/e89910ef-603b-4c20-ba34-307ad4b86e3d/testoutput/test-support/jtreg_open_test_jdk_jdk_svc/tmp -J-ea -J-esa -J-ea -J-esa -J-XX:-UseNotificationThread -J-XX:+UsePerfData -p43873
[Jstatd-Thread] Could not bind //:43873/JStatRemoteHost to RMI Registry
[Jstatd-Thread] java.rmi.NoSuchObjectException: no such object in table
[Jstatd-Thread] at java.rmi/sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(StreamRemoteCall.java:304)
[Jstatd-Thread] at java.rmi/sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:280)
[Jstatd-Thread] at java.rmi/sun.rmi.server.UnicastRef.invoke(UnicastRef.java:382)
[Jstatd-Thread] at java.rmi/sun.rmi.registry.RegistryImpl_Stub.rebind(RegistryImpl_Stub.java:158)
[Jstatd-Thread] at java.rmi/java.rmi.Naming.rebind(Naming.java:177)
[Jstatd-Thread] at jdk.jstatd/sun.tools.jstatd.Jstatd.bind(Jstatd.java:62)
[Jstatd-Thread] at jdk.jstatd/sun.tools.jstatd.Jstatd.main(Jstatd.java:154)