On Tue, 20 Apr 2021 07:31:43 GMT, Yasumasa Suenaga <ysuen...@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 <ysuen...@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 ------------- PR: https://git.openjdk.java.net/jdk/pull/3582
