ADDITIONAL SYSTEM INFORMATION :
SLES 12.3, Linux 4.4.120-94.17-default #1 SMP Wed Mar 14 17:23:00 UTC 2018 (cf3a7bb) x86_64 x86_64 x86_64 GNU/Linux
Java 1.8.0_181, also seen on 192-ea build

A DESCRIPTION OF THE PROBLEM :
> jmap -F -dump:format=b,file=<hprof-file> <pid>
Attaching to process ID 281194, please wait...
Debugger attached successfully.
Server compiler detected.
JVM version is 25.181-b13
Dumping heap to <hprof-file> ...
Exception in thread "main" java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at sun.tools.jmap.JMap.runTool(JMap.java:201)
at sun.tools.jmap.JMap.main(JMap.java:130)
Caused by: sun.jvm.hotspot.debugger.UnmappedAddressException: 7f80eb840010
at sun.jvm.hotspot.debugger.PageCache.checkPage(PageCache.java:208)
at sun.jvm.hotspot.debugger.PageCache.getData(PageCache.java:63)
at sun.jvm.hotspot.debugger.DebuggerBase.readBytes(DebuggerBase.java:225)
at sun.jvm.hotspot.debugger.linux.LinuxDebuggerLocal.readCInteger(LinuxDebuggerLocal.java:498)
at sun.jvm.hotspot.debugger.DebuggerBase.readAddressValue(DebuggerBase.java:462)
at sun.jvm.hotspot.debugger.linux.LinuxDebuggerLocal.readAddress(LinuxDebuggerLocal.java:433)
at sun.jvm.hotspot.debugger.linux.LinuxAddress.getAddressAt(LinuxAddress.java:74)
at sun.jvm.hotspot.types.basic.BasicField.getAddress(BasicField.java:168)
at sun.jvm.hotspot.types.basic.BasicAddressFieldWrapper.getValue(BasicAddressFieldWrapper.java:43)
at sun.jvm.hotspot.utilities.HashtableEntry.literalValue(HashtableEntry.java:53)
at sun.jvm.hotspot.memory.SymbolTable.symbolsDo(SymbolTable.java:100)
at sun.jvm.hotspot.utilities.HeapHprofBinWriter.writeSymbols(HeapHprofBinWriter.java:929)
at sun.jvm.hotspot.utilities.HeapHprofBinWriter.write(HeapHprofBinWriter.java:424)
at sun.jvm.hotspot.tools.HeapDumper.run(HeapDumper.java:62)
at sun.jvm.hotspot.tools.Tool.startInternal(Tool.java:260)
at sun.jvm.hotspot.tools.Tool.start(Tool.java:223)
at sun.jvm.hotspot.tools.Tool.execute(Tool.java:118)
at sun.jvm.hotspot.tools.HeapDumper.main(HeapDumper.java:83)
... 6 more

On 192 early access build the stack trace is a bit different:

Attaching to process ID 42558, please wait...
Debugger attached successfully.
Server compiler detected.
JVM version is 25.192-b04
Dumping heap to <hprof-file> ...
0x00007f74efa5d410
sun.jvm.hotspot.debugger.UnmappedAddressException: 7f74efa5d410
at sun.jvm.hotspot.debugger.PageCache.checkPage(PageCache.java:208)
at sun.jvm.hotspot.debugger.PageCache.getData(PageCache.java:63)
at sun.jvm.hotspot.debugger.DebuggerBase.readBytes(DebuggerBase.java:225)
at sun.jvm.hotspot.debugger.linux.LinuxDebuggerLocal.readCInteger(LinuxDebuggerLocal.java:498)
at sun.jvm.hotspot.debugger.linux.LinuxAddress.getCIntegerAt(LinuxAddress.java:69)
at sun.jvm.hotspot.types.basic.BasicField.getCInteger(BasicField.java:162)
at sun.jvm.hotspot.types.basic.BasicCIntegerField.getValue(BasicCIntegerField.java:54)
at sun.jvm.hotspot.oops.Symbol.getLength(Symbol.java:78)
at sun.jvm.hotspot.oops.Symbol.asByteArray(Symbol.java:101)
at sun.jvm.hotspot.oops.Symbol.asString(Symbol.java:112)
at sun.jvm.hotspot.utilities.HeapHprofBinWriter.writeSymbol(HeapHprofBinWriter.java:944)
at sun.jvm.hotspot.utilities.HeapHprofBinWriter.access$400(HeapHprofBinWriter.java:310)
at sun.jvm.hotspot.utilities.HeapHprofBinWriter$3.visit(HeapHprofBinWriter.java:932)
at sun.jvm.hotspot.memory.SymbolTable.symbolsDo(SymbolTable.java:100)
at sun.jvm.hotspot.utilities.HeapHprofBinWriter.writeSymbols(HeapHprofBinWriter.java:929)
at sun.jvm.hotspot.utilities.HeapHprofBinWriter.write(HeapHprofBinWriter.java:424)
at sun.jvm.hotspot.tools.HeapDumper.run(HeapDumper.java:62)
at sun.jvm.hotspot.tools.Tool.startInternal(Tool.java:260)
at sun.jvm.hotspot.tools.Tool.start(Tool.java:223)
at sun.jvm.hotspot.tools.Tool.execute(Tool.java:118)
at sun.jvm.hotspot.tools.HeapDumper.main(HeapDumper.java:83)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at sun.tools.jmap.JMap.runTool(JMap.java:201)
at sun.tools.jmap.JMap.main(JMap.java:130)
Exception in thread "main" java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at sun.tools.jmap.JMap.runTool(JMap.java:201)
at sun.tools.jmap.JMap.main(JMap.java:130)
Caused by: java.lang.NullPointerException
at sun.jvm.hotspot.utilities.HeapHprofBinWriter.writeSymbol(HeapHprofBinWriter.java:944)
at sun.jvm.hotspot.utilities.HeapHprofBinWriter.access$400(HeapHprofBinWriter.java:310)
at sun.jvm.hotspot.utilities.HeapHprofBinWriter$3.visit(HeapHprofBinWriter.java:932)
at sun.jvm.hotspot.memory.SymbolTable.symbolsDo(SymbolTable.java:100)
at sun.jvm.hotspot.utilities.HeapHprofBinWriter.writeSymbols(HeapHprofBinWriter.java:929)
at sun.jvm.hotspot.utilities.HeapHprofBinWriter.write(HeapHprofBinWriter.java:424)
at sun.jvm.hotspot.tools.HeapDumper.run(HeapDumper.java:62)
at sun.jvm.hotspot.tools.Tool.startInternal(Tool.java:260)
at sun.jvm.hotspot.tools.Tool.start(Tool.java:223)
at sun.jvm.hotspot.tools.Tool.execute(Tool.java:118)
at sun.jvm.hotspot.tools.HeapDumper.main(HeapDumper.java:83)
... 6 more


STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Run the command in the description against a Java process.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Hprof file gets generated successfully.
ACTUAL -
I get the exception and hprof file does not get generated.

FREQUENCY : often