G1: Bigapps fail with SIGSEGV in GCTaskThread

When running bigapps application with -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC the application crashes after several hours of running.

#
# A fatal error has been detected by the Java Runtime Environment:
#
# SIGSEGV (0xb) at pc=0xcdfa7cbe, pid=9142, tid=4
#
# JRE version: 6.0_20-b06
# Java VM: Java HotSpot(TM) Server VM (16.3-b04 mixed mode solaris-x86 )
# Problematic frame:
# V [libjvm.so+0x3a7cbe]
#
# If you would like to submit a bug report, please visit:
# http://java.sun.com/webapps/bugreport/crash.jsp
#

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

Current thread (0x08079800): GCTaskThread [stack: 0x00000000,0x00000000] [id=4]

siginfo:si_signo=SIGSEGV: si_errno=0, si_code=1 (SEGV_MAPERR), si_addr=0x00000058

Registers:
EAX=0x00000000, EBX=0x00000000, ECX=0x006f0074, EDX=0x006f006c
ESP=0xcd8e8334, EBP=0xcd8e8384, ESI=0xa3fcbcc8, EDI=0xcd8ec9fc
EIP=0xcdfa7cbe, EFLAGS=0x00010246

The test can fail in and around 2 hours to 29 hours. But it is constanly reproducable.