The following test failed in the JDK21 CI:

serviceability/sa/UniqueVtableTest.java

Here's a snippet from the log file:

#section:main
----------messages:(9/624)----------
command: main UniqueVtableTest
reason: User specified action: run main/othervm UniqueVtableTest
started: Thu Mar 09 19:36:22 UTC 2023
Mode: othervm [/othervm specified]
Additional options from @modules: --add-modules jdk.hotspot.agent --add-exports jdk.hotspot.agent/sun.jvm.hotspot=ALL-UNNAMED --add-exports jdk.hotspot.agent/sun.jvm.hotspot.debugger=ALL-UNNAMED --add-exports jdk.hotspot.agent/sun.jvm.hotspot.types=ALL-UNNAMED --add-exports jdk.hotspot.agent/sun.jvm.hotspot.types.basic=ALL-UNNAMED
Timeout information:
--- Timeout information end.
finished: Thu Mar 09 19:44:57 UTC 2023
elapsed time (seconds): 515.263
----------configuration:(7/366)----------
Boot Layer
  add modules: jdk.hotspot.agent
  add exports: jdk.hotspot.agent/sun.jvm.hotspot ALL-UNNAMED
               jdk.hotspot.agent/sun.jvm.hotspot.debugger ALL-UNNAMED
               jdk.hotspot.agent/sun.jvm.hotspot.types ALL-UNNAMED
               jdk.hotspot.agent/sun.jvm.hotspot.types.basic ALL-UNNAMED

----------System.out:(19/2187)----------
Command line: ['/opt/mach5/mesos/work_dir/jib-master/install/jdk-21+14-1075/linux-x64-debug.jdk/jdk-21/fastdebug/bin/java' '-XX:MaxRAMPercentage=4.16667' '-Dtest.boot.jdk=/opt/mach5/mesos/work_dir/jib-master/install/jdk/19/36/bundles/linux-x64/jdk-19_linux-x64_bin.tar.gz/jdk-19' '-Djava.io.tmpdir=/opt/mach5/mesos/work_dir/slaves/782b3f2b-1fe4-42ad-a0aa-b7bf2f5b3ebf-S9633/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/ca653cf0-a006-4488-b8be-75fcba263926/runs/9e175864-d06c-4096-893b-eb3945a8f3cb/testoutput/test-support/jtreg_open_test_hotspot_jtreg_tier1_serviceability/tmp' '-cp' '/opt/mach5/mesos/work_dir/slaves/782b3f2b-1fe4-42ad-a0aa-b7bf2f5b3ebf-S9633/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/ca653cf0-a006-4488-b8be-75fcba263926/runs/9e175864-d06c-4096-893b-eb3945a8f3cb/testoutput/test-support/jtreg_open_test_hotspot_jtreg_tier1_serviceability/classes/5/serviceability/sa/UniqueVtableTest.d:/opt/mach5/mesos/work_dir/slaves/782b3f2b-1fe4-42ad-a0aa-b7bf2f5b3ebf-S9633/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/ca653cf0-a006-4488-b8be-75fcba263926/runs/9e175864-d06c-4096-893b-eb3945a8f3cb/testoutput/test-support/jtreg_open_test_hotspot_jtreg_tier1_serviceability/classes/5/test/lib' 'jdk.test.lib.apps.LingeredApp' 'db363039-a9c8-4d5e-b3c8-7aa3f79e3af4.lck']
LingeredApp startup took 1120ms
Check for hs_err_pid/core/mdmp files:
None.
Attaching to process ID 1642995...
Timeout refired 480 times
 LingeredApp stdout: [];
 LingeredApp stderr: []
 LingeredApp exitValue = 4991
LingeredApp.stopApp error:
java.io.IOException: LingeredApp terminated with non-zero exit code 4991
at jdk.test.lib.apps.LingeredApp.stopApp(LingeredApp.java:427)
at jdk.test.lib.apps.LingeredApp.stopApp(LingeredApp.java:515)
at UniqueVtableTest.run(UniqueVtableTest.java:155)
at UniqueVtableTest.main(UniqueVtableTest.java:175)
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
at java.base/java.lang.reflect.Method.invoke(Method.java:578)
at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:125)
at java.base/java.lang.Thread.run(Thread.java:1623)
----------System.err:(15/927)----------
ERROR: The process with pid 1642995 does not exist.
java.io.IOException: LingeredApp terminated with non-zero exit code 4991
at jdk.test.lib.apps.LingeredApp.stopApp(LingeredApp.java:427)
at jdk.test.lib.apps.LingeredApp.stopApp(LingeredApp.java:515)
at UniqueVtableTest.run(UniqueVtableTest.java:155)
at UniqueVtableTest.main(UniqueVtableTest.java:175)
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
at java.base/java.lang.reflect.Method.invoke(Method.java:578)
at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:125)
at java.base/java.lang.Thread.run(Thread.java:1623)

JavaTest Message: Test threw exception: java.io.IOException: LingeredApp terminated with non-zero exit code 4991
JavaTest Message: shutting down test

STATUS:Failed.`main' threw exception: java.io.IOException: LingeredApp terminated with non-zero exit code 4991
----------rerun:(39/7576)*----------