A JVM that core dumps is defective - assuming no user-supplied native code is used and no dependencies of the JVM are defective. Post the core dump and narrow down exactly what produces the segmentation fault.
Signal 11 is SIGSEGV (Segmentation Violation) and this error is coming from the JVM level (namely from a C application)
what it calls 'javacore' is in fact a dump of stack traces at the moment the error has occured for you to give a hint (in this case I don't think it will help much since it will be on Java level not C)
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