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  1. JDK
  2. JDK-8187402

SA: UnknownOopException occurs on Stack Memory window in HSDB

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    Details

    • Type: Bug
    • Status: Resolved
    • Priority: P4
    • Resolution: Fixed
    • Affects Version/s: 9, 10
    • Fix Version/s: 10
    • Component/s: hotspot
    • Subcomponent:
    • Resolved In Build:
      b31

      Description

      http://mail.openjdk.java.net/pipermail/serviceability-dev/2017-August/021770.html

         - Suggested fix
           http://cr.openjdk.java.net/~ysuenaga/hsdb-fix/oopmap/

         - How to reproduce
          1. Start JShell
          2. Attach HSDB to jdk.jshell/jdk.internal.jshell.tool.JShellToolProvider
              $ jhsdb hsdb --pid <PID of JShellToolProvider>
          3. Choose "output reader" thread on Java Threads window
          4. Click "Stack Memory" icon on "Java Threads" toolbar.

         - Stack trace
      ```
      Error while performing oopsDo for frame sp: 0x00007f80986cb630, unextendedSP: 0x00007f80986cb630, fp: null, pc: 0x00007f80c32edfeb
      sun.jvm.hotspot.oops.UnknownOopException
      at jdk.hotspot.agent/sun.jvm.hotspot.oops.ObjectHeap.newOop(ObjectHeap.java:264)
      at jdk.hotspot.agent/sun.jvm.hotspot.HSDB$34$1.addAnnotation(HSDB.java:1098)
      at jdk.hotspot.agent/sun.jvm.hotspot.HSDB$34$1.visitAddress(HSDB.java:1045)
      at jdk.hotspot.agent/sun.jvm.hotspot.compiler.ImmutableOopMapSet$MyVisitor.visitOopLocation(ImmutableOopMapSet.java:58)
      at jdk.hotspot.agent/sun.jvm.hotspot.compiler.ImmutableOopMapSet.allDo(ImmutableOopMapSet.java:230)
      at jdk.hotspot.agent/sun.jvm.hotspot.compiler.ImmutableOopMapSet.oopsDo(ImmutableOopMapSet.java:179)
      at jdk.hotspot.agent/sun.jvm.hotspot.runtime.Frame.oopsCodeBlobDo(Frame.java:618)
      at jdk.hotspot.agent/sun.jvm.hotspot.runtime.Frame.oopsDo(Frame.java:444)
      at jdk.hotspot.agent/sun.jvm.hotspot.HSDB$34.run(HSDB.java:1038)
      at jdk.hotspot.agent/sun.jvm.hotspot.utilities.WorkerThread$MainLoop.run(WorkerThread.java:70)
      at java.base/java.lang.Thread.run(Thread.java:844)
      ```

         According to frame::oopmapreg_to_location(), Frame#oopMapRegToLocation() should be calculated with "VMRegImpl::stack_slot_size". Not address size.
         I saw similar exception and call stack at reverse pointer calculation.

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            • Assignee:
              ysuenaga Yasumasa Suenaga
              Reporter:
              ysuenaga Yasumasa Suenaga
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              • Created:
                Updated:
                Resolved: