A 'jstack -v' on a corefile obtained from an Xshare:on process results in an UnmappedAddressException

[ jini-VirtualBox ClhsdbCDSCore ] $ sudo /home/jini/new16/hs/build/linux-x86_64-normal-server-fastdebug/images/jdk/bin/jhsdb clhsdb --core cds_core_file --exe /home/jini/new16/hs/build/linux-x86_64-normal-server-fastdebug/images/jdk/bin/java
Opening core file, please wait...
javax.script.ScriptException: TypeError: sapkg.runtime.VM.getVM is not a function in sa.js at line number 54
javax.script.ScriptException: TypeError: sapkg.runtime.VM.getVM is not a function in sa.js at line number 54
Warning! JS Engine can't start, some commands will not be available.
hsdb> jstack -v
Deadlock Detection:

No deadlocks found.

"Error accessing address 0x7bff58520
sun.jvm.hotspot.debugger.UnmappedAddressException: 7bff58520
        at jdk.hotspot.agent/sun.jvm.hotspot.debugger.PageCache.checkPage(PageCache.java:208)
        at jdk.hotspot.agent/sun.jvm.hotspot.debugger.PageCache.getData(PageCache.java:63)
        at jdk.hotspot.agent/sun.jvm.hotspot.debugger.DebuggerBase.readBytes(DebuggerBase.java:225)
        at jdk.hotspot.agent/sun.jvm.hotspot.debugger.linux.LinuxDebuggerLocal.readCInteger(LinuxDebuggerLocal.java:494)
        at jdk.hotspot.agent/sun.jvm.hotspot.debugger.DebuggerBase.readCompKlassAddressValue(DebuggerBase.java:477)
        at jdk.hotspot.agent/sun.jvm.hotspot.debugger.linux.LinuxDebuggerLocal.readCompKlassAddress(LinuxDebuggerLocal.java:440)
        at jdk.hotspot.agent/sun.jvm.hotspot.debugger.linux.LinuxAddress.getCompKlassAddressAt(LinuxAddress.java:84)
        at jdk.hotspot.agent/sun.jvm.hotspot.oops.Oop.getKlassForOopHandle(Oop.java:210)
        at jdk.hotspot.agent/sun.jvm.hotspot.oops.ObjectHeap.newOop(ObjectHeap.java:252)
        at jdk.hotspot.agent/sun.jvm.hotspot.oops.NarrowOopField.getValue(NarrowOopField.java:44)
        at jdk.hotspot.agent/sun.jvm.hotspot.oops.OopUtilities.threadOopGetName(OopUtilities.java:263)
        at jdk.hotspot.agent/sun.jvm.hotspot.runtime.JavaThread.getThreadName(JavaThread.java:372)
        at jdk.hotspot.agent/sun.jvm.hotspot.runtime.JavaThread.printThreadInfoOn(JavaThread.java:485)
        at jdk.hotspot.agent/sun.jvm.hotspot.tools.StackTrace.run(StackTrace.java:77)
        at jdk.hotspot.agent/sun.jvm.hotspot.CommandProcessor$26.doit(CommandProcessor.java:1075)
        at jdk.hotspot.agent/sun.jvm.hotspot.CommandProcessor.executeCommand(CommandProcessor.java:1983)
        at jdk.hotspot.agent/sun.jvm.hotspot.CommandProcessor.executeCommand(CommandProcessor.java:1953)
        at jdk.hotspot.agent/sun.jvm.hotspot.CommandProcessor.run(CommandProcessor.java:1833)
        at jdk.hotspot.agent/sun.jvm.hotspot.CLHSDB.run(CLHSDB.java:99)
        at jdk.hotspot.agent/sun.jvm.hotspot.CLHSDB.main(CLHSDB.java:40)
        at jdk.hotspot.agent/sun.jvm.hotspot.SALauncher.runCLHSDB(SALauncher.java:191)
        at jdk.hotspot.agent/sun.jvm.hotspot.SALauncher.main(SALauncher.java:439)
hsdb>