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  1. JDK
  2. JDK-1228006

large number of objects causes crash.

    Details

    • Type: Bug
    • Status: Closed
    • Priority: P2
    • Resolution: Duplicate
    • Affects Version/s: 1.0
    • Fix Version/s: None
    • Component/s: hotspot
    • Labels:
    • Subcomponent:
    • CPU:
      sparc
    • OS:
      solaris_2.4

      Description


      The following code causes a segv during runtime. The command to execute the code
      is given following the code.

      --------------
      class Compute_Seconds {
         public static double Compute( long milliseconds ) {
               return (double) milliseconds / 1000.0;
         }
      }

      class MyObject {
         public long creation_time;
         MyObject() {
            creation_time = System.currentTimeMillis();
         }
      }

      class createObjects {
         public static void main( String args[] ) {

            MyObject myArray[];
            Long Number_Of_Objects = Long.valueOf( args[0] );

            long elapsed_time = 0;
            double time_in_seconds = 0.0;
            double time_per_object = 0.0;

            System.out.println("About to create objects.");
            myArray = new MyObject[Number_Of_Objects.intValue()];
            for (int i = 0; i < myArray.length; i++) {
               myArray[i] = new MyObject();
            }
            System.out.println("Finished creating objects.");

            elapsed_time = myArray[myArray.length-1].creation_time -
                           myArray[0].creation_time;

            System.out.println("Elapsed time = " + elapsed_time + "milliseconds.");

            time_in_seconds = Compute_Seconds.Compute( elapsed_time );
            System.out.println("Which is " + time_in_seconds + " seconds.");

            time_per_object = (double) elapsed_time /
      Number_Of_Objects.doubleValue();
            System.out.println("Time per object = " + time_per_object +
      "milliseconds.");
         }
      }
      -----------------------

      Command: java createObjects 400000
      --------

      Output:
      ------
      [216][wspace] ? java createObjects 400000
      About to create objects.
      SIGSEGV 11* segmentation violation
          si_signo [11]: SIGSEGV 11* segmentation violation
          si_errno [0]: Error 0
          si_code [1]: SEGV_ACCERR [addr: 0xedf66734]

      stackbase=EFFFF63C, stackpointer=EFFFF320

      Full thread dump:
          "Finalizer thread" (TID:0xee300358, sys_thread_t:0xef490de8) prio=1
          "Async Garbage Collector" (TID:0xee300308, sys_thread_t:0xef4c0de8) prio=1
          "Idle thread" (TID:0xee300290, sys_thread_t:0xef4f0de8) prio=0
          "clock handler" (TID:0xee300098, sys_thread_t:0xef5b0de8) prio=11
          "main" (TID:0xee300048, sys_thread_t:0x63dc0) prio=5 *current thread*
      createObjects.main(createObjects.java:27)
      Monitor Cache Dump:
      Registered Monitor Dump:
          Finalize me queue lock: unowned
          Thread queue lock: unowned
          Class lock: unowned
          Java stack lock: unowned
          Code rewrite lock: unowned
          Heap lock: monitor owner: "main"
          Has finalization queue lock: unowned
          Monitor IO lock: unowned
          Child death monitor: unowned
          Event monitor: unowned
          I/O monitor: unowned
          Alarm monitor: unowned
      Waiting to be notified:
      "clock handler"
          Sbrk lock: unowned
          Monitor cache lock: unowned
          Monitor registry: monitor owner: "main"
      Thread Alarm Q:
      Segmentation fault

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              • Assignee:
                tlindholsunw Timothy Lindholm (Inactive)
                Reporter:
                vssriniv Vijay Srinivasan (Inactive)
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                • Created:
                  Updated:
                  Resolved:
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