On Tue, 20 Apr 2021 23:18:43 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. > > Yasumasa Suenaga has updated the pull request incrementally with one > additional commit since the last revision: > > Remove unused imports Marked as reviewed by cjplummer (Reviewer). ------------- PR: https://git.openjdk.java.net/jdk/pull/3582
