IBM JDK crashes with "OutOfMemoryError: native memory exhausted"

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Issue

After increasing the heap on an IBM JDK above 4 GB the following is seen:

OutOfMemoryError: native memory exhausted

The following in the javacore:

1TISIGINFO     Dump Event "systhrow" (00040000) Detail "java/lang/OutOfMemoryError" "native memory exhausted" received

Environment

Red Hat Enterprise Linux 6.x
Red Hat Enterprise Linux 5.x
IBM JDK

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