Name: szC45993 Date: 11/24/99



 /net/sqesvr/vsn/testbase/testbase_nsk/src/nsk/arguments/args00122 test,
which uses developing options, crashes java_g (java version "1.3beta"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.3beta-O)
Java HotSpot(TM) Client VM (build 1.3-P, mixed mode))
on WinNT (Pentium II, 350MHz, 128Mb RAM, Windows NT 4.0 Workstation).
See log and source below.

LOG:
====

------------------------------- FIRST RUN ---------------------------------

[#] f:/ld24/java/zss/_BOX_for_SAVING/_TMP/_/jdk1.3O/bin/java -version
java version "1.3beta"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.3beta-O)
Java HotSpot(TM) Client VM (build 1.3-P, mixed mode)
[#] f:/ld24/java/zss/_BOX_for_SAVING/_TMP/_/jdk1.3O/bin/java -XX:Flags=f:/ld24/java/zss/TONGA_WSs/testbase_js/src/nsk/arguments/args00122/gammarc.gammarc -verify args0122
VM option '+PrintVMMessages'
VM option '+PromptForDebug'
VM option '+TraceVMOperation'
VM option '+PrintCompilation'
VM option '+PrintAssembly'
VM option '+PrintNMethods'
VM option '+PrintNativeNMethods'
VM option '+PrintCodeCache'
VM option '+PrintCodeCache2'
VM option '+DumpEventsAtError'
VM option '+PrintStubCode'
VM option '+ProfilerPrintByteCodeStatistics'
VM option '+ProfilerRecordPC'
VM option '+ProfilerCheckIntervals'
VM option '+PrintJVMWarnings'

...

#
# HotSpot Virtual Machine Error, Internal Error
#
# Fatal: memory stomping error
#
# Error ID: C:/hotspot\src\share\vm\runtime\os.cpp, 395
#
[#]


SOURCES:
========

//--------------------- args00122.java:
/* This test simply creates a series of circularly
 * linked memeory objects which should be able to be
 * GC'd
 */


class MemoryObject
{
    byte array[];
    MemoryObject next;
    MemoryObject previous;

    public MemoryObject(int size)
    {
        array = new byte[size];
    }
}

class args00122
{
    static final int ARRAY_SIZE = 100;
    static final int OBJECT_SIZE = 10;
    static final int LOOP_COUNT = 5;
    static final int CIRCULARITY_SIZE = 3;

    static MemoryObject memoryArray[] = new MemoryObject[ARRAY_SIZE];

    public static void main(String args[])
    {
        for (int j = 0; j < LOOP_COUNT; j++)
        {
            System.out.println(j + ": " + Runtime.getRuntime().freeMemory());
            for (int i = 0; i < ARRAY_SIZE; i ++)
            {
                memoryArray[i] = new MemoryObject(OBJECT_SIZE);
                makeCircular(memoryArray[i], CIRCULARITY_SIZE);
            }
        }

        // if there's any memory left, let's assume it's okay
        System.out.println("Test passed.");

    }

    public static void makeCircular(MemoryObject mObj, int depth)
    {
MemoryObject tmpObj = mObj;

        for (int i = 0; i < depth; i++)
        {
            tmpObj.next = new MemoryObject(OBJECT_SIZE);
            tmpObj= tmpObj.next;
        }
tmpObj.next = mObj;
    }

    public static void confirmCircular(MemoryObject mObj)
    {
int count = 0;
MemoryObject mObj2 = mObj;
while (mObj2.next != mObj)
{
count++;
mObj2 = mObj2.next;
}
System.out.println("Circularity level: " + count);
    }
}
//---------------------



#--------------------- gammarc.gammarc:
+PrintVMMessages
+PromptForDebug
+TraceVMOperation
+PrintCompilation
+PrintAssembly
+PrintNMethods
+PrintNativeNMethods
+PrintCodeCache
+PrintCodeCache2
+DumpEventsAtError
+PrintStubCode
+ProfilerPrintByteCodeStatistics
+ProfilerRecordPC
+ProfilerCheckIntervals
+PrintJVMWarnings
#---------------------


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