The following JCK test failed in the JDK20 CI:

vm/jdwp/Event/Composite/composite001/composite001.html

Here's a snippet from the log file:

#section:testExecute
----------messages:(1/1195)----------
command: com.sun.jck.lib.ExecJCKTestOtherJVMCmd LD_LIBRARY_PATH=/opt/mach5/mesos/work_dir/jib-master/install/jck/20/b07/extra/bundles/JCK-extra-20.zip/JCK-extra-20/binaries/linux-amd64/lib /opt/mach5/mesos/work_dir/jib-master/install/jdk-20+24-1755/linux-x64-debug.jdk/jdk-20/fastdebug/bin/java --enable-preview -Djava.awt.headless=true -XX:+CreateCoredumpOnCrash -XX:+UseParallelGC -XX:+UseNUMA -XX:MaxRAMPercentage=4.16667 --show-version -Xms32m -Xmx1024m -Djdk.attach.allowAttachSelf=true -Djava.security.properties=/opt/mach5/mesos/work_dir/jib-master/install/jck/20/b07/extra/bundles/JCK-extra-20.zip/JCK-extra-20/extra.security.properties -agentlib:jdwp=server=y,transport=dt_socket,address=ol8-x64-129413.s5.javaplatfo1iad.oraclevcn.com:33421,suspend=n -classpath :/opt/mach5/mesos/work_dir/jib-master/install/jck/20/b07/bundles/JCK-runtime-20.jar/JCK-runtime-20/classes: -Djava.security.policy=/opt/mach5/mesos/work_dir/jib-master/install/jck/20/b07/bundles/JCK-runtime-20.jar/JCK-runtime-20/lib/jck.policy javasoft.sqe.jck.lib.jpda.jdwp.DebuggeeLoader -waittime=600 -msgSwitch=ol8-x64-129413:40803 -componentName=Event.Composite.composite001 -debuggeeName=Event.Composite.composite001a
----------out1:(1/376)----------
JDWP exit error JVMTI_ERROR_WRONG_PHASE(112): Can't disable vthread end events [/opt/mach5/mesos/work_dir/slaves/0c72054a-24ab-4dbb-944f-97f9341a1b96-S137544/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/a21a55f1-28c1-4cef-b19c-55dd4e8a05aa/runs/b0208cba-0838-413a-a6b5-979dcf89d75b/workspace/open/src/jdk.jdwp.agent/share/native/libjdwp/eventHandler.c:1652]
----------out2:(6/349)----------
Listening for transport dt_socket at address: 33421
java 20-ea 2023-03-21
Java(TM) SE Runtime Environment (fastdebug build 20-ea+24-1755)
Java HotSpot(TM) 64-Bit Server VM (fastdebug build 20-ea+24-1755, mixed mode, sharing)
Debugee PASSED
FATAL ERROR in native method: JDWP Can't disable vthread end events, jvmtiError=JVMTI_ERROR_WRONG_PHASE(112)
result: Failed. unexpected exit code: exit code 134