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Help understanding JVM Crash Dump file

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I am using JNI to run some native code from Java. The code runs fine in Windows XP system. When i port the code to Linux and try running it there, It runs perfectly for 2-3 times. And after that it crashes. This crash is so random that it crashes the first time sometimes. Sometimes it works for 2-3 times and then crashes.

As the code is running fine for some time, the problem may be with the memory.

My Java Memory Arguments are "-Xms 768m -Xmx1024m".
Java Version : 1.6.0_12 and I am running my application in Weblogic 11g.

Every time it crashes, it gives me a JVM crash dump file, from which I am not able to decode the problem.

Here is the latest crash dump file:

Can anyone help me to locate the reason for these random crashes ? Is the problem with Heap Memory as some of the statics say the memory space is 99% used ?
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