JVM crashed with SIGSEGV in CompactibleFreeListSpace::block_size:
#
# A fatal error has been detected by the Java Runtime Environment:
#
# SIGSEGV (0xb) at pc=0xfffffd7fc656ab9d, pid=26157, tid=6
#
# JRE version: Java(TM) SE Runtime Environment (8.0-b99) (build 1.8.0-ea-fastdebug-b99)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (25.0-b41-fastdebug mixed mode solaris-amd64 compressed oops)
# Problematic frame:
# V [libjvm.so+0xdeab9d] unsigned long CompactibleFreeListSpace::block_size(const HeapWord*)const+0x1c1
#
# Failed to write core dump. Core dumps have been disabled. To enable core dumping, try "ulimit -c unlimited" before starting Java again
#
# If you would like to submit a bug report, please visit:
# http://bugreport.sun.com/bugreport/crash.jsp
#
...
Stack: [0xfffffd7ffb130000,0xfffffd7ffb230000], sp=0xfffffd7ffb22e500, free space=1017k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
V [libjvm.so+0xdeab9d] unsigned long CompactibleFreeListSpace::block_size(const HeapWord*)const+0x1c1
V [libjvm.so+0xdfaf94] void CompactibleFreeListSpace::prepare_for_compaction(CompactPoint*)+0x4d4
V [libjvm.so+0x1265ae4] void Generation::prepare_for_compaction(CompactPoint*)+0x30
V [libjvm.so+0x1231a95] void GenCollectedHeap::prepare_for_compaction()+0x55
V [libjvm.so+0x1233a2a] void GenMarkSweep::invoke_at_safepoint(int,ReferenceProcessor*,bool)+0x472
V [libjvm.so+0xeacd6f] void CMSCollector::do_compaction_work(bool)+0x67f
V [libjvm.so+0xeab925] void CMSCollector::acquire_control_and_collect(bool,bool)+0x799
V [libjvm.so+0xeaa57b] void ConcurrentMarkSweepGeneration::collect(bool,bool,unsigned long,bool)+0x6bb
V [libjvm.so+0x122d84d] void GenCollectedHeap::do_collection(bool,bool,unsigned long,bool,int)+0xb15
V [libjvm.so+0x1230613] void GenCollectedHeap::do_full_collection(bool,int)+0xa7
V [libjvm.so+0x2778473] void VM_GenCollectFull::doit()+0xd3
V [libjvm.so+0x27a39bd] void VM_Operation::evaluate()+0xf9
V [libjvm.so+0x27a0721] void VMThread::evaluate_operation(VM_Operation*)+0x1d9
V [libjvm.so+0x27a10c0] void VMThread::loop()+0x548
V [libjvm.so+0x27a0216] void VMThread::run()+0xb6
V [libjvm.so+0x2183602] java_start+0x1ce
C [libc.so.1+0x1222ad] _thrp_setup+0xa5
C [libc.so.1+0x122550] _lwp_start+0x0

VM_Operation (0xfffffd7ff45fe130): GenCollectFull, mode: safepoint, requested by thread 0x00000000022a9800

Issue could be reproduced intermittently.