V [libjvm.so+0x7e5fc8] FindInstanceClosure::do_object(oopDesc*)+0x58
V [libjvm.so+0xe28f97] void ZHeapIterator::objects_do<true>(ObjectClosure*)+0x177
V [libjvm.so+0xe257de] ZHeap::object_iterate(ObjectClosure*, bool)+0x2e
V [libjvm.so+0x7e4d1b] HeapInspection::find_instances_at_safepoint(Klass*, GrowableArray<oopDesc*>*)+0x4b
V [libjvm.so+0xd7bf75] ConcurrentLocksDump::dump_at_safepoint()+0xa5
V [libjvm.so+0xdda5e0] VM_ThreadDump::doit()+0x240
V [libjvm.so+0xdda6f7] VM_Operation::evaluate()+0xe7
V [libjvm.so+0xde1577] VMThread::evaluate_operation(VM_Operation*) [clone .constprop.68]+0xc7
V [libjvm.so+0xde1cfe] VMThread::loop()+0x67e
V [libjvm.so+0xde1fd7] VMThread::run()+0x77
V [libjvm.so+0xd6f5dd] Thread::call_run()+0x10d
V [libjvm.so+0xbc21c7] thread_native_entry(Thread*)+0xe7

Instruction seems to be:
cmp rsi,QWORD PTR [rdi+rdx*1]
jne loc_00000000

RSI=0x00007f859a903510 is a pointer to class:
java.util.concurrent.locks.AbstractOwnableSynchronizer {0x00007f859a903510}
RDX=0x0000000000000038 is an unknown value
RDI=0x0000000000000001 is an unknown value