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  1. JDK
  2. JDK-8210289

ArchivedKlassSubGraphInfoRecord is incomplete

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    • Resolved In Build:
      b11

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        Description

        When heapShared.cpp dumps a sub-graph of heap objects, it attempts to record all the classes of all the objects that are referenced by this sub-graph.

        However, if one of these objects have already been visited while a previous sub-graph was dumped, then this object's class is not recorded in the current sub-graph.

        The bug is in the return statement of the following block

        http://hg.openjdk.java.net/jdk/jdk/file/9720ad0a40b6/src/hotspot/share/memory/heapShared.cpp#l394

              oop archived = MetaspaceShared::find_archived_heap_object(obj);
              if (archived != NULL) {
                ...
                return;
              }

        At runtime, if the current sub-graph is restored before any other sub-graphs, we will end up with a live object in the Java heap with an uninitialized class.

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                • Assignee:
                  iklam Ioi Lam
                  Reporter:
                  iklam Ioi Lam
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                    Updated:
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