Integrated: 8265505: findsym does not work on remote debug server

[Yasumasa Suenaga]

On Tue, 20 Apr 2021 07:31:43 GMT, Yasumasa Suenaga <ysuenaga at openjdk.org> wrote:

> We can see following error when we run `findsym` on CLHSDB which connects to remote debug server.
> 
> 
> hsdb> verbose true
> hsdb> findsym gHotSpotVMTypes
> 0x00007f913d4a45b0Error: java.lang.NullPointerException: Cannot invoke "sun.jvm.hotspot.debugger.cdbg.CDebugger.loadObjectContainingPC(sun.jvm.hotspot.debugger.Address)" because "cdbg" is null
> java.lang.NullPointerException: Cannot invoke "sun.jvm.hotspot.debugger.cdbg.CDebugger.loadObjectContainingPC(sun.jvm.hotspot.debugger.Address)" because "cdbg" is null
>         at jdk.hotspot.agent/sun.jvm.hotspot.CommandProcessor$7.doit(CommandProcessor.java:618)
>         at jdk.hotspot.agent/sun.jvm.hotspot.CommandProcessor.executeCommand(CommandProcessor.java:2116)
>         at jdk.hotspot.agent/sun.jvm.hotspot.CommandProcessor.executeCommand(CommandProcessor.java:2086)
>         at jdk.hotspot.agent/sun.jvm.hotspot.CommandProcessor.run(CommandProcessor.java:1957)
>         at jdk.hotspot.agent/sun.jvm.hotspot.CLHSDB.run(CLHSDB.java:112)
>         at jdk.hotspot.agent/sun.jvm.hotspot.CLHSDB.main(CLHSDB.java:44)
>         at jdk.hotspot.agent/sun.jvm.hotspot.SALauncher.runCLHSDB(SALauncher.java:282)
>         at jdk.hotspot.agent/sun.jvm.hotspot.SALauncher.main(SALauncher.java:493)
> 
> 
> The cause of this NPE is that CDebugger is null.  It happens when the debugger is running on debugd server.
> Command line debugger like CLHSDB can delegate the command to debugd, like `pmap` and `pstack`. `findsym` can also use this scheme.
> 
> This PR has passed serviceability/sa tests on Linux x64.

This pull request has now been integrated.

Changeset: 8bcebe73
Author:    Yasumasa Suenaga <ysuenaga at openjdk.org>
URL:       https://git.openjdk.java.net/jdk/commit/8bcebe73d283bd651a0e2d30133e40cca655f335
Stats:     94 lines in 6 files changed: 44 ins; 30 del; 20 mod

8265505: findsym does not work on remote debug server

Reviewed-by: cjplummer, kevinw

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PR: https://git.openjdk.java.net/jdk/pull/3582