The following test failed in the JDK23 CI:

com/sun/jdi/RedefineImplementor.java

Here's a snippet from the log file:

#section:main
----------messages:(7/302)----------
command: main RedefineImplementor
reason: User specified action: run main/othervm RedefineImplementor
started: Tue Jul 16 21:18:52 UTC 2024
Mode: othervm [/othervm specified]
Additional options from @modules: --add-modules jdk.jdi
finished: Tue Jul 16 21:19:02 UTC 2024
elapsed time (seconds): 10.156
----------configuration:(3/35)----------
Boot Layer
  add modules: jdk.jdi

----------System.out:(35/4336)----------
Command line: [/opt/mach5/mesos/work_dir/jib-master/install/jdk-23+32-2349/linux-x64-debug.jdk/jdk-23/fastdebug/bin/java -cp /opt/mach5/mesos/work_dir/slaves/a4a7850a-7c35-410a-b879-d77fbb2f6087-S137282/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/d703181a-ea67-4db2-94fd-11255f9a2368/runs/672d5164-c856-41c4-a2ca-06b335b82e10/testoutput/test-support/jtreg_open_test_jdk_jdk_svc/classes/5/com/sun/jdi/RedefineImplementor.d:/opt/mach5/mesos/work_dir/jib-master/install/jdk-23+32-2349/src.full/open/test/jdk/com/sun/jdi:/opt/mach5/mesos/work_dir/slaves/a4a7850a-7c35-410a-b879-d77fbb2f6087-S137282/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/d703181a-ea67-4db2-94fd-11255f9a2368/runs/672d5164-c856-41c4-a2ca-06b335b82e10/testoutput/test-support/jtreg_open_test_jdk_jdk_svc/classes/5/test/lib:/opt/mach5/mesos/work_dir/jib-master/install/jdk-23+32-2349/src.full/open/test/lib:/opt/mach5/mesos/work_dir/jib-master/install/jtreg/7.3.1/1/bundles/jtreg-7.3.1+1.zip/jtreg/lib/jtreg.jar -Xmx768m -XX:MaxRAMPercentage=4.16667 -Dtest.boot.jdk=/opt/mach5/mesos/work_dir/jib-master/install/jdk/22/36/bundles/linux-x64/jdk-22_linux-x64_bin.tar.gz/jdk-22 -Djava.io.tmpdir=/opt/mach5/mesos/work_dir/slaves/a4a7850a-7c35-410a-b879-d77fbb2f6087-S137282/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/d703181a-ea67-4db2-94fd-11255f9a2368/runs/672d5164-c856-41c4-a2ca-06b335b82e10/testoutput/test-support/jtreg_open_test_jdk_jdk_svc/tmp -ea -esa -ea -esa -XX:-UseNotificationThread -agentlib:jdwp=transport=dt_socket,server=y,suspend=y RedefineImplementorTarg ]
[debuggee]:/opt/mach5/mesos/work_dir/jib-master/install/jdk-23+32-2349/linux-x64-debug.jdk/jdk-23/fastdebug/bin/java -cp /opt/mach5/mesos/work_dir/slaves/a4a7850a-7c35-410a-b879-d77fbb2f6087-S137282/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/d703181a-ea67-4db2-94fd-11255f9a2368/runs/672d5164-c856-41c4-a2ca-06b335b82e10/testoutput/test-support/jtreg_open_test_jdk_jdk_svc/classes/5/com/sun/jdi/RedefineImplementor.d:/opt/mach5/mesos/work_dir/jib-master/install/jdk-23+32-2349/src.full/open/test/jdk/com/sun/jdi:/opt/mach5/mesos/work_dir/slaves/a4a7850a-7c35-410a-b879-d77fbb2f6087-S137282/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/d703181a-ea67-4db2-94fd-11255f9a2368/runs/672d5164-c856-41c4-a2ca-06b335b82e10/testoutput/test-support/jtreg_open_test_jdk_jdk_svc/classes/5/test/lib:/opt/mach5/mesos/work_dir/jib-master/install/jdk-23+32-2349/src.full/open/test/lib:/opt/mach5/mesos/work_dir/jib-master/install/jtreg/7.3.1/1/bundles/jtreg-7.3.1+1.zip/jtreg/lib/jtreg.jar -Xmx768m -XX:MaxRAMPercentage=4.16667 -Dtest.boot.jdk=/opt/mach5/mesos/work_dir/jib-master/install/jdk/22/36/bundles/linux-x64/jdk-22_linux-x64_bin.tar.gz/jdk-22 -Djava.io.tmpdir=/opt/mach5/mesos/work_dir/slaves/a4a7850a-7c35-410a-b879-d77fbb2f6087-S137282/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/d703181a-ea67-4db2-94fd-11255f9a2368/runs/672d5164-c856-41c4-a2ca-06b335b82e10/testoutput/test-support/jtreg_open_test_jdk_jdk_svc/tmp -ea -esa -ea -esa -XX:-UseNotificationThread -agentlib:jdwp=transport=dt_socket,server=y,suspend=y RedefineImplementorTarg
[debuggee] Listening for transport dt_socket at address: 60033
[jdb] Set uncaught java.lang.Throwable
[jdb] Set deferred uncaught java.lang.Throwable
[jdb] Initializing jdb ...
[jdb]
[jdb] VM Started: > No frames on the current call stack
[jdb]
[jdb] main[1]
> stop at RedefineImplementorTarg:49
[jdb] Deferring breakpoint RedefineImplementorTarg:49.
[jdb] It will be set after the class is loaded.
[jdb] main[1]
> run
[debuggee] RedefineImplementorTarg's run
[jdb] > Set deferred breakpoint RedefineImplementorTarg:49
[jdb]
[jdb] Breakpoint hit: "thread=main", RedefineImplementorTarg.main(), line=49 bci=12
[jdb] 49 RedefineImplementorB.func(r); // @1 breakpoint
[jdb]
[jdb] main[1]
> redefine RedefineImplementorTarg ./ver1/RedefineImplementorTarg.class
[jdb] main[1]
> use ./ver1
[jdb] main[1]
> cont
[debuggee] RedefineImplementorTarg's run
[debuggee] This is the new version of RedefineImplementorTarg
[jdb] >
[jdb] The application exited
[jdb]
=======================================
Exception thrown during test execution: 'This is the new version of ' missing from stdout/stderr
=======================================
----------System.err:(20/1373)----------
Java HotSpot(TM) 64-Bit Server VM warning: Option UseNotificationThread was deprecated in version 23.0 and will likely be removed in a future release.
[debuggee] Java HotSpot(TM) 64-Bit Server VM warning: Option UseNotificationThread was deprecated in version 23.0 and will likely be removed in a future release.
 stdout: [Listening for transport dt_socket at address: 60033];
 stderr: [Listening for transport dt_socket at address: 60033]
 exitValue = -1

java.lang.RuntimeException: 'This is the new version of ' missing from stdout/stderr
at jdk.test.lib.process.OutputAnalyzer.shouldContain(OutputAnalyzer.java:252)
at RedefineImplementor.runCases(RedefineImplementor.java:80)
at lib.jdb.JdbTest.run(JdbTest.java:96)
at RedefineImplementor.main(RedefineImplementor.java:62)
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
at java.base/java.lang.reflect.Method.invoke(Method.java:580)
at com.sun.javatest.regtest.agent.MainWrapper$MainTask.run(MainWrapper.java:138)
at java.base/java.lang.Thread.run(Thread.java:1575)

JavaTest Message: Test threw exception: java.lang.RuntimeException: 'This is the new version of ' missing from stdout/stderr
JavaTest Message: shutting down test

STATUS:Failed.`main' threw exception: java.lang.RuntimeException: 'This is the new version of ' missing from stdout/stderr
----------rerun:(41/6933)*----------

The test's output shows:

> [debuggee] This is the new version of RedefineImplementorTarg

so I'm not sure why the test failed with:

RuntimeException: 'This is the new version of ' missing from stdout/stderr