64-bit JVM intermittently crashes with following assert while extensive class loading/unloading with fixed metaspace size when COOPS turned on:

#
# A fatal error has been detected by the Java Runtime Environment:
#
# Internal Error (/HUDSON/workspace/2-build-solaris-amd64/jdk8/5069/hotspot/src/share/vm/gc_implementation/parallelScavenge/psParallelCompact.cpp:3386), pid=19424, tid=4
# assert(destination() == (HeapWord*)moved_oop + moved_oop->size()) failed: sanity
#
# JRE version: Java(TM) SE Runtime Environment (8.0-b98) (build 1.8.0-ea-fastdebug-b98)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (25.0-b40-fastdebug mixed mode solaris-amd64 compressed oops)
# Core dump written. Default location: /export/local/aurora/sandbox/results/ResultDir/jck60022/core or core.19424
#
# 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 (0x000000000045d800): GCTaskThread [stack: 0xfffffd7ffea43000,0xfffffd7ffeb43000] [id=4]

Stack: [0xfffffd7ffea43000,0xfffffd7ffeb43000], sp=0xfffffd7ffeb3fe00, free space=1011k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
V [libjvm.so+0x2771ac4] void VMError::report(outputStream*)+0x92c
V [libjvm.so+0x2772f2c] void VMError::report_and_die()+0x56c
V [libjvm.so+0xf6b4d3] void report_vm_error(const char*,int,const char*,const char*)+0x55f
V [libjvm.so+0x22fad98] ParMarkBitMap::IterationStatus MoveAndUpdateClosure::do_addr(HeapWord*,unsigned long)+0x1548
V [libjvm.so+0x21c6ca0] ParMarkBitMap::IterationStatus ParMarkBitMap::iterate(ParMarkBitMapClosure*,unsigned long,unsigned long)const+0x3e0
V [libjvm.so+0x22f5e73] void PSParallelCompact::fill_region(ParCompactionManager*,unsigned long)+0x92f
V [libjvm.so+0x22ba52d] void ParCompactionManager::drain_region_stacks()+0x529
V [libjvm.so+0x226de91] void StealRegionCompactionTask::do_it(GCTaskManager*,unsigned)+0x141
V [libjvm.so+0x11f6d03] void GCTaskThread::run()+0x473
V [libjvm.so+0x217ff52] java_start+0x1ce
C [libc.so.1+0x1222ad] _thrp_setup+0xa5
C [libc.so.1+0x122550] _lwp_start+0x0
....
Events (10 events):
Event: 88.531 Executing VM operation: CollectForMetadataAllocation done
Event: 88.531 Executing VM operation: ParallelGCSystemGC
Event: 88.988 Executing VM operation: ParallelGCSystemGC done
Event: 89.089 Executing VM operation: CollectForMetadataAllocation
Event: 89.544 Executing VM operation: CollectForMetadataAllocation done
Event: 89.545 Executing VM operation: ParallelGCSystemGC
Event: 90.008 Executing VM operation: ParallelGCSystemGC done
Event: 91.432 Executing VM operation: CollectForMetadataAllocation
Event: 91.877 Executing VM operation: CollectForMetadataAllocation done
Event: 93.208 Executing VM operation: CollectForMetadataAllocation
...

Issue could be reproduced with 8b98, 8b99. Not sure about previous builds, but at least I was not able to reproduce such issue during long period of time using them. Also, I was not able to reproduce it with 32-bit JVM as well as with -XX:-UseCompressedOops.