Internal Error: gc/g1/ptrQueue.hpp:126 assert(_index == _sz) failed: invariant: queues are empty when activated

jdk9 b89 PIT
runtime/Metaspace/FragmentMetaspace.java failed on win32 (seen once)

#
# Internal Error (C:\jprt\T\P1\002332.amurillo\s\hotspot\src\share\vm\gc/g1/ptrQueue.hpp:126), pid=220080, tid=184968
# assert(_index == _sz) failed: invariant: queues are empty when activated.
#
# JRE version: Java(TM) SE Runtime Environment (9.0) (build 1.9.0-internal-fastdebug-20151027002332.amurillo.jdk9-hs-2015-10--b00)
# Java VM: Java HotSpot(TM) Server VM (1.9.0-internal-20151027002332.amurillo.jdk9-hs-2015-10--b00, compiled mode, tiered, g1 gc, windows-x86)
# Core dump will be written. Default location: C:\Users\aurora\sandbox\results\workDir\runtime\Metaspace\FragmentMetaspace\hs_err_pid220080.mdmp
#

--------------- S U M M A R Y ------------

Command Line: -Dtest.src=C:\Users\aurora\CommonData\j2se_hotspot\hotspot\test\runtime\Metaspace -Dtest.src.path=C:\Users\aurora\CommonData\j2se_hotspot\hotspot\test\runtime\Metaspace;C:\Users\aurora\CommonData\j2se_hotspot\hotspot\test\runtime\testlibrary -Dtest.classes=C:\Users\aurora\sandbox\results\workDir\classes\runtime\Metaspace -Dtest.class.path=C:\Users\aurora\sandbox\results\workDir\classes\runtime\Metaspace;C:\Users\aurora\sandbox\results\workDir\classes\runtime\testlibrary -Dtest.vm.opts= -Dtest.tool.vm.opts= -Dtest.compiler.opts= -Dtest.java.opts=-Xcomp -server -Xcomp -Dtest.jdk=c:\users\aurora\CommonData\jdk -Dcompile.jdk=c:\users\aurora\CommonData\jdk -Dtest.timeout.factor=3.0 -Dtest.nativepath=C:\users\aurora\sandbox\JTREG_NATIVEPATH_LIBRARY_PREPARED -Xcomp -Xcomp -Djava.library.path=C:\users\aurora\sandbox\JTREG_NATIVEPATH_LIBRARY_PREPARED -Xmx300m com.sun.javatest.regtest.agent.MainWrapper C:\Users\aurora\sandbox\results\workDir\classes\runtime\Metaspace\FragmentMetaspace.jta

Host: busgo3007, Intel(R) Xeon(R) CPU E5-2690 0 @ 2.90GHz, 2 cores, 15G, Windows Server 2012 R2 , 64 bit Build 9600 (6.3.9600.17415)
Time: Tue Oct 27 03:34:11 2015 Eastern Daylight Time elapsed time: 52 seconds (0d 0h 0m 52s)

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

Current thread (0x258ccc00): VMThread [stack: 0x25b00000,0x25b50000] [id=184968]

Stack: [0x25b00000,0x25b50000], sp=0x25b4ee4c, free space=315k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
V [jvm.dll+0x2e0415]
V [jvm.dll+0x2e08f7]
V [jvm.dll+0x2d4239]
V [jvm.dll+0x475d7e]
V [jvm.dll+0x428596]
V [jvm.dll+0x477ff6]
V [jvm.dll+0x2a9003]
V [jvm.dll+0x2a6f20]
V [jvm.dll+0x2a77d5]
V [jvm.dll+0x2a7d94]
V [jvm.dll+0x317bc1]
C [msvcr120.dll+0x2c01d]
C [msvcr120.dll+0x2c001]
C [KERNEL32.DLL+0x17c04]
C [ntdll.dll+0x5ad1f]
C [ntdll.dll+0x5acea]

VM_Operation (0x271cf0dc): G1IncCollectionPause, mode: safepoint, requested by thread 0x26b25000