G1 crashes with

assert(obj == oopDesc::load_decode_heap_oop(p)) failed: p should still be pointing to obj

Here is head dof hs_err file
;; Using jvm: "/export/local/common/jdk/baseline/solaris-amd64/jre/lib/amd64/server/libjvm.so"
#
# A fatal error has been detected by the Java Runtime Environment:
#
# Internal Error (/tmp/jprt/P1/014930.jcoomes/source/hotspot/src/share/vm/gc_implementation/g1/g1OopClosures.inline.hpp:88), pid=22626, tid=6
# assert(obj == oopDesc::load_decode_heap_oop(p)) failed: p should still be pointing to obj
#
# JRE version: 8.0
# Java VM: Java HotSpot(TM) 64-Bit Server VM (23.0-b06-fastdebug mixed mode solaris-amd64 compressed oops)
# Core dump written. Default location: /export/local/56370.HSX.PIT.VM_solaris-amd64_vm__server_mixed_vm.parallel_class_loading.testlist/results/ResultDir/init-simple/core or core.22626
#
# If you would like to submit a bug report, please visit:
# http://bugreport.sun.com/bugreport/crash.jsp
#

--------------- T H R E A D ---------------

Current thread (0x0000000000452800): GCTaskThread [stack: 0x0000000000000000,0x0000000000000000] [id=6]

Stack:
[error occurred during error reporting (printing stack bounds), id 0xe0000000]

Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
V [libjvm.so+0x2703ff4] void VMError::report(outputStream*)+0x8c8;; void VMError::report(outputStream*)+0x8c8
V [libjvm.so+0x2705139] void VMError::report_and_die()+0x4fd;; void VMError::report_and_die()+0x4fd
V [libjvm.so+0xe87f7b] void report_vm_error(const char*,int,const char*,const char*)+0x55f;; void report_vm_error(const char*,int,const char*,const char*)+0x55f
V [libjvm.so+0x2704b42] void VMError::report(outputStream*)+0x1416;; void VMError::report(outputStream*)+0x1416
V [libjvm.so+0x2705139] void VMError::report_and_die()+0x4fd;; void VMError::report_and_die()+0x4fd
V [libjvm.so+0xe87f7b] void report_vm_error(const char*,int,const char*,const char*)+0x55f;; void report_vm_error(const char*,int,const char*,const char*)+0x55f
V [libjvm.so+0x142f522] int instanceRefKlass::oop_oop_iterate_backwards_nv(oop,G1ParScanClosure*)+0x8d6e;; int instanceRefKlass::oop_oop_iterate_backwards_nv(oop,G1ParScanClosure*)+0x8d6e
V [libjvm.so+0x103d2ce] oop G1ParCopyHelper::copy_to_survivor_space(oop,bool,bool)+0x1962;; oop G1ParCopyHelper::copy_to_survivor_space(oop,bool,bool)+0x1962
V [libjvm.so+0x107c1ef] void G1ParCopyClosure<false,(G1Barrier)2,false>::do_oop_work<unsigned>(__type_3*)+0x4eb;; void G1ParCopyClosure<false,(G1Barrier)2,false>::do_oop_work<unsigned>(__type_3*)+0x4eb
V [libjvm.so+0x103e5f8] void G1ParEvacuateFollowersClosure::do_void()+0x6a0;; void G1ParEvacuateFollowersClosure::do_void()+0x6a0
V [libjvm.so+0x104f914] void G1ParTask::work(int)+0x6d8;; void G1ParTask::work(int)+0x6d8
V [libjvm.so+0x2745433] void GangWorker::loop()+0x51f;; void GangWorker::loop()+0x51f
V [libjvm.so+0x215fea2] java_start+0x6a6;; java_start+0x6a6
C [libc.so.1+0xd704b] _thr_setup+0x5b;; _thr_setup+0x5b
C [libc.so.1+0xd7280] ht_pause+0x10;; _lwp_start+0x0