[macosx] closed/java/awt/Frame/DisposeStressTest/DisposeStressTest.html failed on some macos

regression test closed/java/awt/Frame/DisposeStressTest/DisposeStressTest.html failed on macos 10.8.3 and passed on macos 10.8.2
it failed with jdk7u21b12, jdk7u21b04, jdk7u10b18

failure log:
----------System.out:(20/927)----------
#
# A fatal error has been detected by the Java Runtime Environment:
#
# SIGSEGV (0xb) at pc=0x00000001174fa4f2, pid=63619, tid=1799
#
# JRE version: 7.0_21-b12
# Java VM: Java HotSpot(TM) 64-Bit Server VM (23.21-b01 mixed mode bsd-amd64 compressed oops)
# Problematic frame:
# C [IOAccelerator+0x24f2] IOAccelContextGetSidebandBuffer+0x1a
#
# Failed to write core dump. Core dumps have been disabled. To enable core dumping, try "ulimit -c unlimited" before starting Java again
#
# An error report file with more information is saved as:
# /export/local/aurora/sandbox/results/20130408184045/27/current/workDir/closed/java/awt/Frame/DisposeStressTest/DisposeStressTest/hs_err_pid63619.log
#
# If you would like to submit a bug report, please visit:
# http://bugreport.sun.com/bugreport/crash.jsp
# The crash happened outside the Java Virtual Machine in native code.
# See problematic frame for where to report the bug.
#
----------System.err:(0/0)----------
result: Failed. Unexpected exit from test [exit code: 134]