The following test failed in the JDK18 CI:

sun/management/jmxremote/startstop/JMXStartStopTest.java

Here's a snippet from the log file:

**** Test thirteen ****
Command line: [/System/Volumes/Data/mesos/work_dir/jib-master/install/jdk-18+17-971/macosx-x64-debug.jdk/jdk-18/fastdebug/bin/java -cp /System/Volumes/Data/mesos/work_dir/slaves/a2dc162d-743b-4800-9e92-31f85abb45b1-S499/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/64df41f3-9513-4763-88fb-5112bffd450f/runs/fd83e152-6b3c-42e9-ae70-2363ee964b55/testoutput/test-support/jtreg_open_test_jdk_jdk_management/classes/1/sun/management/jmxremote/startstop/JMXStartStopTest.d:/System/Volumes/Data/mesos/work_dir/jib-master/install/jdk-18+17-971/src.full/open/test/jdk/sun/management/jmxremote/startstop:/System/Volumes/Data/mesos/work_dir/slaves/a2dc162d-743b-4800-9e92-31f85abb45b1-S499/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/64df41f3-9513-4763-88fb-5112bffd450f/runs/fd83e152-6b3c-42e9-ae70-2363ee964b55/testoutput/test-support/jtreg_open_test_jdk_jdk_management/classes/1/test/lib:/System/Volumes/Data/mesos/work_dir/jib-master/install/jdk-18+17-971/src.full/open/test/lib:/System/Volumes/Data/mesos/work_dir/jib-master/install/jtreg/6/1/bundles/jtreg-6+1.zip/jtreg/lib/javatest.jar:/System/Volumes/Data/mesos/work_dir/jib-master/install/jtreg/6/1/bundles/jtreg-6+1.zip/jtreg/lib/jtreg.jar -cp /System/Volumes/Data/mesos/work_dir/slaves/a2dc162d-743b-4800-9e92-31f85abb45b1-S499/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/64df41f3-9513-4763-88fb-5112bffd450f/runs/fd83e152-6b3c-42e9-ae70-2363ee964b55/testoutput/test-support/jtreg_open_test_jdk_jdk_management/classes/1/sun/management/jmxremote/startstop/JMXStartStopTest.d:/System/Volumes/Data/mesos/work_dir/slaves/a2dc162d-743b-4800-9e92-31f85abb45b1-S499/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/64df41f3-9513-4763-88fb-5112bffd450f/runs/fd83e152-6b3c-42e9-ae70-2363ee964b55/testoutput/test-support/jtreg_open_test_jdk_jdk_management/classes/1/test/lib -XX:+UsePerfData -Dcom.sun.management.jmxremote.port=53325 -Dcom.sun.management.jmxremote.authenticate=false -Dcom.sun.management.jmxremote.ssl=true TestApp ]
[TestApp{test_13}]:/System/Volumes/Data/mesos/work_dir/jib-master/install/jdk-18+17-971/macosx-x64-debug.jdk/jdk-18/fastdebug/bin/java -cp /System/Volumes/Data/mesos/work_dir/slaves/a2dc162d-743b-4800-9e92-31f85abb45b1-S499/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/64df41f3-9513-4763-88fb-5112bffd450f/runs/fd83e152-6b3c-42e9-ae70-2363ee964b55/testoutput/test-support/jtreg_open_test_jdk_jdk_management/classes/1/sun/management/jmxremote/startstop/JMXStartStopTest.d:/System/Volumes/Data/mesos/work_dir/jib-master/install/jdk-18+17-971/src.full/open/test/jdk/sun/management/jmxremote/startstop:/System/Volumes/Data/mesos/work_dir/slaves/a2dc162d-743b-4800-9e92-31f85abb45b1-S499/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/64df41f3-9513-4763-88fb-5112bffd450f/runs/fd83e152-6b3c-42e9-ae70-2363ee964b55/testoutput/test-support/jtreg_open_test_jdk_jdk_management/classes/1/test/lib:/System/Volumes/Data/mesos/work_dir/jib-master/install/jdk-18+17-971/src.full/open/test/lib:/System/Volumes/Data/mesos/work_dir/jib-master/install/jtreg/6/1/bundles/jtreg-6+1.zip/jtreg/lib/javatest.jar:/System/Volumes/Data/mesos/work_dir/jib-master/install/jtreg/6/1/bundles/jtreg-6+1.zip/jtreg/lib/jtreg.jar -cp /System/Volumes/Data/mesos/work_dir/slaves/a2dc162d-743b-4800-9e92-31f85abb45b1-S499/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/64df41f3-9513-4763-88fb-5112bffd450f/runs/fd83e152-6b3c-42e9-ae70-2363ee964b55/testoutput/test-support/jtreg_open_test_jdk_jdk_management/classes/1/sun/management/jmxremote/startstop/JMXStartStopTest.d:/System/Volumes/Data/mesos/work_dir/slaves/a2dc162d-743b-4800-9e92-31f85abb45b1-S499/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/64df41f3-9513-4763-88fb-5112bffd450f/runs/fd83e152-6b3c-42e9-ae70-2363ee964b55/testoutput/test-support/jtreg_open_test_jdk_jdk_management/classes/1/test/lib -XX:+UsePerfData -Dcom.sun.management.jmxremote.port=53325 -Dcom.sun.management.jmxremote.authenticate=false -Dcom.sun.management.jmxremote.ssl=true TestApp
[TestApp{test_13}] main enter
[jcmd]:/System/Volumes/Data/mesos/work_dir/jib-master/install/jdk-18+17-971/macosx-x64-debug.jdk/jdk-18/fastdebug/bin/jcmd TestApp ManagementAgent.stop
[jcmd] 31429:
[jcmd] Command executed successfully
[jcmd]:/System/Volumes/Data/mesos/work_dir/jib-master/install/jdk-18+17-971/macosx-x64-debug.jdk/jdk-18/fastdebug/bin/jcmd TestApp ManagementAgent.start jmxremote.ssl=false jmxremote.port=53325
[jcmd] 31429:
[jcmd] Command executed successfully
[TestApp{test_13}] read: 0
[TestApp{test_13}] main exit
(took 4223ms)

Please note the above test does not say "=== PASSED" like
the other 14 tests.

----------System.err:(71/5836)----------
[jcmd] java.lang.RuntimeException: Invalid agent state: Agent already started
[jcmd] java.lang.RuntimeException: Invalid agent state: Agent already started
[jcmd] java.lang.RuntimeException: Invalid agent state: Agent already started
[TestApp{test_09}] Error: JMX connector server communication error: service:jmx:rmi://<host>:53293
[TestApp{test_09}] jdk.internal.agent.AgentConfigurationError: java.rmi.server.ExportException: Port already in use: 53293; nested exception is:
[TestApp{test_09}] java.net.BindException: Address already in use
[TestApp{test_09}] at jdk.management.agent/sun.management.jmxremote.ConnectorBootstrap.exportMBeanServer(ConnectorBootstrap.java:843)
[TestApp{test_09}] at jdk.management.agent/sun.management.jmxremote.ConnectorBootstrap.startRemoteConnectorServer(ConnectorBootstrap.java:480)
[TestApp{test_09}] at jdk.management.agent/jdk.internal.agent.Agent.startRemoteManagementAgent(Agent.java:388)
[TestApp{test_09}] Caused by: java.rmi.server.ExportException: Port already in use: 53293; nested exception is:
[TestApp{test_09}] java.net.BindException: Address already in use
[TestApp{test_09}] at java.rmi/sun.rmi.transport.tcp.TCPTransport.listen(TCPTransport.java:356)
[TestApp{test_09}] at java.rmi/sun.rmi.transport.tcp.TCPTransport.exportObject(TCPTransport.java:251)
[TestApp{test_09}] at java.rmi/sun.rmi.transport.tcp.TCPEndpoint.exportObject(TCPEndpoint.java:415)
[TestApp{test_09}] at java.rmi/sun.rmi.transport.LiveRef.exportObject(LiveRef.java:147)
[TestApp{test_09}] at java.rmi/sun.rmi.server.UnicastServerRef.exportObject(UnicastServerRef.java:235)
[TestApp{test_09}] at jdk.management.agent/sun.management.jmxremote.ConnectorBootstrap$PermanentExporter.exportObject(ConnectorBootstrap.java:205)
[TestApp{test_09}] at java.management.rmi/javax.management.remote.rmi.RMIJRMPServerImpl.export(RMIJRMPServerImpl.java:153)
[TestApp{test_09}] at java.management.rmi/javax.management.remote.rmi.RMIJRMPServerImpl.export(RMIJRMPServerImpl.java:138)
[TestApp{test_09}] at java.management.rmi/javax.management.remote.rmi.RMIConnectorServer.start(RMIConnectorServer.java:453)
[TestApp{test_09}] at jdk.management.agent/sun.management.jmxremote.ConnectorBootstrap.exportMBeanServer(ConnectorBootstrap.java:839)
[TestApp{test_09}] ... 2 more
[TestApp{test_09}] Caused by: java.net.BindException: Address already in use
[TestApp{test_09}] at java.base/sun.nio.ch.Net.bind0(Native Method)
[TestApp{test_09}] at java.base/sun.nio.ch.Net.bind(Net.java:555)
[TestApp{test_09}] at java.base/sun.nio.ch.Net.bind(Net.java:544)
[TestApp{test_09}] at java.base/sun.nio.ch.NioSocketImpl.bind(NioSocketImpl.java:640)
[TestApp{test_09}] at java.base/java.net.ServerSocket.bind(ServerSocket.java:388)
[TestApp{test_09}] at java.base/java.net.ServerSocket.<init>(ServerSocket.java:274)
[TestApp{test_09}] at java.base/java.net.ServerSocket.<init>(ServerSocket.java:167)
[TestApp{test_09}] at java.rmi/sun.rmi.transport.tcp.TCPDirectSocketFactory.createServerSocket(TCPDirectSocketFactory.java:45)
[TestApp{test_09}] at java.rmi/sun.rmi.transport.tcp.TCPEndpoint.newServerSocket(TCPEndpoint.java:673)
[TestApp{test_09}] at java.rmi/sun.rmi.transport.tcp.TCPTransport.listen(TCPTransport.java:344)
[TestApp{test_09}] ... 11 more
[jcmd] java.lang.RuntimeException: jdk.internal.agent.AgentConfigurationError: java.rmi.server.ExportException: Port already in use: 53293; nested exception is: java.net.BindException: Address already in use
test_13 failed
java.lang.reflect.InvocationTargetException
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:568)
at JMXStartStopTest.main(JMXStartStopTest.java:289)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:568)
at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:127)
at java.base/java.lang.Thread.run(Thread.java:833)
Caused by: java.rmi.NoSuchObjectException: no such object in table
at java.rmi/sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(StreamRemoteCall.java:304)
at java.rmi/sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:280)
at java.rmi/sun.rmi.server.UnicastRef.invoke(UnicastRef.java:381)
at java.rmi/sun.rmi.registry.RegistryImpl_Stub.list(RegistryImpl_Stub.java:91)
at JMXStartStopTest.doTestConnect(JMXStartStopTest.java:195)
at JMXStartStopTest.testConnect(JMXStartStopTest.java:169)
at JMXStartStopTest.testConnect(JMXStartStopTest.java:160)
at JMXStartStopTest.test_13(JMXStartStopTest.java:809)
... 11 more
java.lang.Error
at JMXStartStopTest.main(JMXStartStopTest.java:315)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:568)
at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:127)
at java.base/java.lang.Thread.run(Thread.java:833)

JavaTest Message: Test threw exception: java.lang.Error
JavaTest Message: shutting down test

STATUS:Failed.`main' threw exception: java.lang.Error
----------rerun:(40/7398)*----------

I'm assuming that the above System.err output is related to
"Test thirteen" not passing.