The following test failed in the JDK16 CI:

serviceability/sa/ClhsdbFindPC.java#id0

Here's a snippet from the log file:

Attaching to process 87819, please wait...

Target JDK is not signed.
Starting clhsdb against 87819
Adding 'sudo -E -n' to the command.
[2021-01-03T07:07:16.916510Z] Gathering output for process 87853
[2021-01-03T07:07:18.001183Z] Waiting for completion for process 87853
[2021-01-03T07:07:18.001331Z] Waiting for completion finished for process 87853
Output:
hsdb> hsdb> + verbose true
hsdb> + findpc 0x000000011c21db04
Command not valid until attached to a VM
hsdb> + quit
Attaching to process 87819, please wait...
Unable to connect to process ID 87819:

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.run(CLHSDB.java:61)
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)

[2021-01-03T07:07:18.001904Z] Waiting for completion for process 87853
[2021-01-03T07:07:18.002021Z] Waiting for completion finished for process 87853
 LingeredApp stdout: [];
 LingeredApp stderr: []
 LingeredApp exitValue = 0
----------System.err:(45/3215)----------
 stdout: [hsdb> hsdb> + verbose true
hsdb> + findpc 0x000000011c21db04
Command not valid until attached to a VM
hsdb> + quit
];
 stderr: [Attaching to process 87819, please wait...
Unable to connect to process ID 87819:

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.run(CLHSDB.java:61)
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 ClhsdbFindPC.testFindPC(ClhsdbFindPC.java:155)
at ClhsdbFindPC.main(ClhsdbFindPC.java:167)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:78)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:567)
at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:127)
at java.base/java.lang.Thread.run(Thread.java:831)
Caused by: java.lang.RuntimeException: '^sun.jvm.hotspot.debugger.DebuggerException:.*$' 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 ClhsdbFindPC.testFindPC(ClhsdbFindPC.java:150)
... 7 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:(36/7407)*----------

Please note that this is the second attach to PID 87819.
The earlier attach to PID 87819 by the test worked fine.