Issue

When we use jmap to take a heap dump, the target java process crashes. The fatal error log contains:

Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
V  [libjvm.so+0x58c276]  DumperSupport::dump_field_value(DumpWriter*, char, unsigned char*)+0x1c6
V  [libjvm.so+0x58d22a]  DumperSupport::dump_instance_fields(DumpWriter*, oopDesc*)+0x24a
V  [libjvm.so+0x58de6b]  DumperSupport::dump_instance(DumpWriter*, oopDesc*)+0xfb
V  [libjvm.so+0x58f354]  HeapObjectDumper::do_object(oopDesc*)+0x124
V  [libjvm.so+0x8c917a]  ContiguousSpace::object_iterate_from(WaterMark, ObjectClosure*)+0x7a
V  [libjvm.so+0x52fe00]  IterateObjectClosureRegionClosure::doHeapRegion(HeapRegion*)+0x20
V  [libjvm.so+0x59b0a9]  HeapRegionSeq::iterate(HeapRegionClosure*) const+0x49
V  [libjvm.so+0x531fc9]  G1CollectedHeap::safe_object_iterate(ObjectClosure*)+0x39
V  [libjvm.so+0x590dac]  VM_HeapDumper::doit()+0x29c
V  [libjvm.so+0x99bd25]  VM_Operation::evaluate()+0x55
V  [libjvm.so+0x99a15a]  VMThread::evaluate_operation(VM_Operation*)+0xba
V  [libjvm.so+0x99a4de]  VMThread::loop()+0x1ce
V  [libjvm.so+0x99a950]  VMThread::run()+0x70
V  [libjvm.so+0x815668]  java_start(Thread*)+0x108