The following test failed in the JDK16 CI:

serviceability/sa/ClhsdbAttach.java

Here's a snippet from the log file:

----------System.out:(74/5079)----------
Starting ClhsdbAttach test
Command line: ['/System/Volumes/Data/mesos/work_dir/jib-master/install/jdk-16+3-42/macosx-x64-debug.jdk/jdk-16/fastdebug/bin/java' '-XX:MaxRAMPercentage=6' '-Xshare:off' '-showversion' '-cp' '/System/Volumes/Data/mesos/work_dir/slaves/52628e90-e5e7-4ef3-af97-10d8776d10db-S857/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/80a54f56-be5e-493b-bc0e-4d0ffca2388c/runs/24b6faa8-5201-457c-806f-9ffa24f279aa/testoutput/test-support/jtreg_open_test_hotspot_jtreg_tier1_serviceability/classes/2/serviceability/sa/ClhsdbAttach.d:/System/Volumes/Data/mesos/work_dir/slaves/52628e90-e5e7-4ef3-af97-10d8776d10db-S857/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/80a54f56-be5e-493b-bc0e-4d0ffca2388c/runs/24b6faa8-5201-457c-806f-9ffa24f279aa/testoutput/test-support/jtreg_open_test_hotspot_jtreg_tier1_serviceability/classes/2/test/lib' 'jdk.test.lib.apps.LingeredApp' '4746a893-7c5c-4917-b5f9-3d684f2582d9.lck']
Started LingeredApp with pid 9403
Target JDK is not signed.
Adding 'sudo -E -n' to the command.
[2020-06-19T06:58:04.868478Z] Gathering output for process 9407
[2020-06-19T06:58:15.093093Z] Waiting for completion for process 9407
[2020-06-19T06:58:15.093475Z] Waiting for completion finished for process 9407
Output:
hsdb> hsdb> + verbose true
hsdb> + where
Command not valid until attached to a VM
hsdb> + attach 9403
hsdb> + flags MaxJavaStackTraceDepth
Command not valid until attached to a VM
hsdb> + detach
Command not valid until attached to a VM
hsdb> + universe
Command not valid until attached to a VM
hsdb> + reattach
hsdb> + longConstant markWord::locked_value
Command not valid until attached to a VM
hsdb> + quit
java version "16-ea" 2021-03-16
Java(TM) SE Runtime Environment (fastdebug build 16-ea+3-42)
Java HotSpot(TM) 64-Bit Server VM (fastdebug build 16-ea+3-42, mixed mode)
Attaching to process 9403, please wait...
Unable to connect to process ID 9403:

Doesn't appear to be a HotSpot VM (could not find symbol
"gHotSpotVMStructEntryTypeNameOffset" in remote process)
sun.jvm.hotspot.debugger.DebuggerException: Doesn't appear to be a HotSpot VM (could not find symbol "gHotSpotVMStructEntryTypeNameOffset" in remote process)
at jdk.hotspot.agent/sun.jvm.hotspot.HotSpotAgent.setupVM(HotSpotAgent.java:431)
at jdk.hotspot.agent/sun.jvm.hotspot.HotSpotAgent.go(HotSpotAgent.java:330)
at jdk.hotspot.agent/sun.jvm.hotspot.HotSpotAgent.attach(HotSpotAgent.java:139)
at jdk.hotspot.agent/sun.jvm.hotspot.CLHSDB.attachDebugger(CLHSDB.java:180)
at jdk.hotspot.agent/sun.jvm.hotspot.CLHSDB$2.attach(CLHSDB.java:75)
at jdk.hotspot.agent/sun.jvm.hotspot.CommandProcessor$2.doit(CommandProcessor.java:411)
at jdk.hotspot.agent/sun.jvm.hotspot.CommandProcessor.executeCommand(CommandProcessor.java:2051)
at jdk.hotspot.agent/sun.jvm.hotspot.CommandProcessor.executeCommand(CommandProcessor.java:2021)
at jdk.hotspot.agent/sun.jvm.hotspot.CommandProcessor.run(CommandProcessor.java:1901)
at jdk.hotspot.agent/sun.jvm.hotspot.CLHSDB.run(CLHSDB.java:99)
at jdk.hotspot.agent/sun.jvm.hotspot.CLHSDB.main(CLHSDB.java:40)
at jdk.hotspot.agent/sun.jvm.hotspot.SALauncher.runCLHSDB(SALauncher.java:280)
at jdk.hotspot.agent/sun.jvm.hotspot.SALauncher.main(SALauncher.java:483)
Attaching to process 9403, please wait...
Unable to connect to process ID 9403:

Doesn't appear to be a HotSpot VM (could not find symbol "gHotSpotVMTypes" in
remote process)
sun.jvm.hotspot.debugger.DebuggerException: Doesn't appear to be a HotSpot VM (could not find symbol "gHotSpotVMTypes" in remote process)
at jdk.hotspot.agent/sun.jvm.hotspot.HotSpotAgent.setupVM(HotSpotAgent.java:431)
at jdk.hotspot.agent/sun.jvm.hotspot.HotSpotAgent.go(HotSpotAgent.java:330)
at jdk.hotspot.agent/sun.jvm.hotspot.HotSpotAgent.attach(HotSpotAgent.java:139)
at jdk.hotspot.agent/sun.jvm.hotspot.CLHSDB.attachDebugger(CLHSDB.java:180)
at jdk.hotspot.agent/sun.jvm.hotspot.CLHSDB$2.attach(CLHSDB.java:75)
at jdk.hotspot.agent/sun.jvm.hotspot.CLHSDB$2.reattach(CLHSDB.java:88)
at jdk.hotspot.agent/sun.jvm.hotspot.CommandProcessor$1.doit(CommandProcessor.java:402)
at jdk.hotspot.agent/sun.jvm.hotspot.CommandProcessor.executeCommand(CommandProcessor.java:2051)
at jdk.hotspot.agent/sun.jvm.hotspot.CommandProcessor.executeCommand(CommandProcessor.java:2021)
at jdk.hotspot.agent/sun.jvm.hotspot.CommandProcessor.run(CommandProcessor.java:1901)
at jdk.hotspot.agent/sun.jvm.hotspot.CLHSDB.run(CLHSDB.java:99)
at jdk.hotspot.agent/sun.jvm.hotspot.CLHSDB.main(CLHSDB.java:40)
at jdk.hotspot.agent/sun.jvm.hotspot.SALauncher.runCLHSDB(SALauncher.java:280)
at jdk.hotspot.agent/sun.jvm.hotspot.SALauncher.main(SALauncher.java:483)

[2020-06-19T06:58:15.107355Z] Waiting for completion for process 9407
[2020-06-19T06:58:15.107524Z] Waiting for completion finished for process 9407
 LingeredApp stdout: [];
 LingeredApp stderr: [java version "16-ea" 2021-03-16
Java(TM) SE Runtime Environment (fastdebug build 16-ea+3-42)
Java HotSpot(TM) 64-Bit Server VM (fastdebug build 16-ea+3-42, mixed mode)
]
 LingeredApp exitValue = 0
----------System.err:(85/5656)----------
java version "16-ea" 2021-03-16
Java(TM) SE Runtime Environment (fastdebug build 16-ea+3-42)
Java HotSpot(TM) 64-Bit Server VM (fastdebug build 16-ea+3-42, mixed mode)
 stdout: [hsdb> hsdb> + verbose true
hsdb> + where
Command not valid until attached to a VM
hsdb> + attach 9403
hsdb> + flags MaxJavaStackTraceDepth
Command not valid until attached to a VM
hsdb> + detach
Command not valid until attached to a VM
hsdb> + universe
Command not valid until attached to a VM
hsdb> + reattach
hsdb> + longConstant markWord::locked_value
Command not valid until attached to a VM
hsdb> + quit
];
 stderr: [java version "16-ea" 2021-03-16
Java(TM) SE Runtime Environment (fastdebug build 16-ea+3-42)
Java HotSpot(TM) 64-Bit Server VM (fastdebug build 16-ea+3-42, mixed mode)
Attaching to process 9403, please wait...
Unable to connect to process ID 9403:

Doesn't appear to be a HotSpot VM (could not find symbol
"gHotSpotVMStructEntryTypeNameOffset" in remote process)
sun.jvm.hotspot.debugger.DebuggerException: Doesn't appear to be a HotSpot VM (could not find symbol "gHotSpotVMStructEntryTypeNameOffset" in remote process)
at jdk.hotspot.agent/sun.jvm.hotspot.HotSpotAgent.setupVM(HotSpotAgent.java:431)
at jdk.hotspot.agent/sun.jvm.hotspot.HotSpotAgent.go(HotSpotAgent.java:330)
at jdk.hotspot.agent/sun.jvm.hotspot.HotSpotAgent.attach(HotSpotAgent.java:139)
at jdk.hotspot.agent/sun.jvm.hotspot.CLHSDB.attachDebugger(CLHSDB.java:180)
at jdk.hotspot.agent/sun.jvm.hotspot.CLHSDB$2.attach(CLHSDB.java:75)
at jdk.hotspot.agent/sun.jvm.hotspot.CommandProcessor$2.doit(CommandProcessor.java:411)
at jdk.hotspot.agent/sun.jvm.hotspot.CommandProcessor.executeCommand(CommandProcessor.java:2051)
at jdk.hotspot.agent/sun.jvm.hotspot.CommandProcessor.executeCommand(CommandProcessor.java:2021)
at jdk.hotspot.agent/sun.jvm.hotspot.CommandProcessor.run(CommandProcessor.java:1901)
at jdk.hotspot.agent/sun.jvm.hotspot.CLHSDB.run(CLHSDB.java:99)
at jdk.hotspot.agent/sun.jvm.hotspot.CLHSDB.main(CLHSDB.java:40)
at jdk.hotspot.agent/sun.jvm.hotspot.SALauncher.runCLHSDB(SALauncher.java:280)
at jdk.hotspot.agent/sun.jvm.hotspot.SALauncher.main(SALauncher.java:483)
Attaching to process 9403, please wait...
Unable to connect to process ID 9403:

Doesn't appear to be a HotSpot VM (could not find symbol "gHotSpotVMTypes" in
remote process)
sun.jvm.hotspot.debugger.DebuggerException: Doesn't appear to be a HotSpot VM (could not find symbol "gHotSpotVMTypes" in remote process)
at jdk.hotspot.agent/sun.jvm.hotspot.HotSpotAgent.setupVM(HotSpotAgent.java:431)
at jdk.hotspot.agent/sun.jvm.hotspot.HotSpotAgent.go(HotSpotAgent.java:330)
at jdk.hotspot.agent/sun.jvm.hotspot.HotSpotAgent.attach(HotSpotAgent.java:139)
at jdk.hotspot.agent/sun.jvm.hotspot.CLHSDB.attachDebugger(CLHSDB.java:180)
at jdk.hotspot.agent/sun.jvm.hotspot.CLHSDB$2.attach(CLHSDB.java:75)
at jdk.hotspot.agent/sun.jvm.hotspot.CLHSDB$2.reattach(CLHSDB.java:88)
at jdk.hotspot.agent/sun.jvm.hotspot.CommandProcessor$1.doit(CommandProcessor.java:402)
at jdk.hotspot.agent/sun.jvm.hotspot.CommandProcessor.executeCommand(CommandProcessor.java:2051)
at jdk.hotspot.agent/sun.jvm.hotspot.CommandProcessor.executeCommand(CommandProcessor.java:2021)
at jdk.hotspot.agent/sun.jvm.hotspot.CommandProcessor.run(CommandProcessor.java:1901)
at jdk.hotspot.agent/sun.jvm.hotspot.CLHSDB.run(CLHSDB.java:99)
at jdk.hotspot.agent/sun.jvm.hotspot.CLHSDB.main(CLHSDB.java:40)
at jdk.hotspot.agent/sun.jvm.hotspot.SALauncher.runCLHSDB(SALauncher.java:280)
at jdk.hotspot.agent/sun.jvm.hotspot.SALauncher.main(SALauncher.java:483)
]
 exitValue = 0

java.lang.RuntimeException: Test ERROR java.lang.RuntimeException: '^sun.jvm.hotspot.debugger.DebuggerException:.*$' found in stderr: 'sun.jvm.hotspot.debugger.DebuggerException: Doesn't appear to be a HotSpot VM (could not find symbol "gHotSpotVMStructEntryTypeNameOffset" in remote process)'

at ClhsdbAttach.main(ClhsdbAttach.java:75)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:64)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:127)
at java.base/java.lang.Thread.run(Thread.java:832)
Caused by: java.lang.RuntimeException: '^sun.jvm.hotspot.debugger.DebuggerException:.*$' found in stderr: 'sun.jvm.hotspot.debugger.DebuggerException: Doesn't appear to be a HotSpot VM (could not find symbol "gHotSpotVMStructEntryTypeNameOffset" in remote process)'

at jdk.test.lib.process.OutputAnalyzer.shouldNotMatch(OutputAnalyzer.java:372)
at ClhsdbLauncher.runCmd(ClhsdbLauncher.java:148)
at ClhsdbLauncher.run(ClhsdbLauncher.java:200)
at ClhsdbAttach.main(ClhsdbAttach.java:71)
... 6 more

JavaTest Message: Test threw exception: java.lang.RuntimeException: Test ERROR java.lang.RuntimeException: '^sun.jvm.hotspot.debugger.DebuggerException:.*$' found in stderr: 'sun.jvm.hotspot.debugger.DebuggerException: Doesn't appear to be a HotSpot VM (could not find symbol "gHotSpotVMStructEntryTypeNameOffset" in remote process)'

JavaTest Message: shutting down test

STATUS:Failed.`main' threw exception: java.lang.RuntimeException: Test ERROR java.lang.RuntimeException: '^sun.jvm.hotspot.debugger.DebuggerException:.*$' found in stderr: 'sun.jvm.hotspot.debugger.DebuggerException: Doesn't appear to be a HotSpot VM (could not find symbol "gHotSpotVMStructEntryTypeNameOffset" in remote process)'
----------rerun:(34/6234)*----------


This failure happened on a macOSX 10.15.5 machine which
is a very recent update.