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  1. JDK
  2. JDK-8028623

SA: hash codes in SymbolTable mismatching java_lang_String::hash_code for extended characters.

    Details

    • Subcomponent:
    • Resolved In Build:
      b03
    • CPU:
      generic
    • OS:
      generic

      Backports

        Description


        For some Strings containing extended characters, the SA fails to find the String in its SymbolTable as the hash code it calculates does not match that which is stored in the table (which came from
        java_lang_String::hash_code).

        This manifests as jmap -F failing to dump a heap with:

        Exception in thread "main" java.lang.reflect.InvocationTargetException
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:491)
        at sun.tools.jmap.JMap.runTool(JMap.java:197)
        at sun.tools.jmap.JMap.main(JMap.java:128)
        Caused by: java.lang.NullPointerException
        at sun.jvm.hotspot.utilities.HeapHprofBinWriter.writeSymbolID(HeapHprofBinWriter.java:995)
        at sun.jvm.hotspot.utilities.HeapHprofBinWriter.writeFieldDescriptors(HeapHprofBinWriter.java:828)
        at sun.jvm.hotspot.utilities.HeapHprofBinWriter.writeClassDumpRecord(HeapHprofBinWriter.java:587)
        at sun.jvm.hotspot.utilities.HeapHprofBinWriter.access$000(HeapHprofBinWriter.java:310)
        at sun.jvm.hotspot.utilities.HeapHprofBinWriter$1.visit(HeapHprofBinWriter.java:524)
        at sun.jvm.hotspot.memory.SystemDictionary$2.visit(SystemDictionary.java:179)
        at sun.jvm.hotspot.memory.Dictionary.classesDo(Dictionary.java:68)
        at sun.jvm.hotspot.memory.SystemDictionary.classesDo(SystemDictionary.java:190)
        at sun.jvm.hotspot.memory.SystemDictionary.allClassesDo(SystemDictionary.java:183)
        at sun.jvm.hotspot.utilities.HeapHprofBinWriter.writeClassDumpRecords(HeapHprofBinWriter.java:520)
        at sun.jvm.hotspot.utilities.HeapHprofBinWriter.write(HeapHprofBinWriter.java:430)
        at sun.jvm.hotspot.tools.HeapDumper.run(HeapDumper.java:62)
        at sun.jvm.hotspot.tools.Tool.startInternal(Tool.java:260)
        at sun.jvm.hotspot.tools.Tool.start(Tool.java:223)
        at sun.jvm.hotspot.tools.Tool.execute(Tool.java:118)
        at sun.jvm.hotspot.tools.HeapDumper.main(HeapDumper.java:83)
        ... 6 more

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                • Assignee:
                  kevinw Kevin Walls
                  Reporter:
                  kevinw Kevin Walls
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                  • Created:
                    Updated:
                    Resolved: