TEST_BUG: java/nio/channels/AsynchronousChannelGroup/Basic.java fails intermittently

TESTFAIL:java/nio/channels/AsynchronousChannelGroup/Basic.java

The test java/nio/channels/AsynchronousChannelGroup/Basic.java fails intermittently. see log:

#section:main
----------messages:(3/161)----------
command: main -XX:-UseVMInterruptibleIO Basic
reason: User specified action: run main/othervm -XX:-UseVMInterruptibleIO Basic
elapsed time (seconds): 18.377
----------System.out:(3/93)----------
-- test shutdown --
-- test shutdownNow --
-- test operations after group is shutdown --
----------System.err:(14/785)----------
java.lang.RuntimeException: Group should have terminated
at Basic.afterShutdownTests(Basic.java:265)
at Basic.main(Basic.java:50)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at com.sun.javatest.regtest.MainWrapper$MainThread.run(MainWrapper.java:94)
at java.lang.Thread.run(Thread.java:744)

JavaTest Message: Test threw exception: java.lang.RuntimeException: Group should have terminated
JavaTest Message: shutting down test

STATUS:Failed.`main' threw exception: java.lang.RuntimeException: Group should have terminated
----------rerun:(22/2359)*----------
'PATH=C:\\Program Files\\Java\\jdk1.7.0_25\\bin;C:\\curl;C:\\mksnt\\bin64;C:\\mksnt\\bin;C:\\mksnt\\bin\\X11;C:\\mksnt\\mksnt;C:\\Windows\\system32;C:\\Windows;C:\\Windows\\System32\\Wbem;C:\\Windows\\System32\\WindowsPowerShell\\v1.0\\;C:\\Users\\aurora;' \\
SystemDrive=C: \\
'SystemRoot=C:\\Windows' \\
'TEMP=C:\\Users\\aurora\\AppData\\Local\\Temp' \\
'TMP=C:\\Users\\aurora\\AppData\\Local\\Temp' \\
'windir=C:\\Windows' \\
'CLASSPATH=C:\\Users\\aurora\\sandbox_keepme\\jtreg\\lib\\javatest.jar;C:\\Users\\aurora\\sandbox_keepme\\jtreg\\lib\\jtreg.jar;C:\\Users\\aurora\\sandbox_keepme\\results\\run_59\\testoutput\\jdk_nio\\JTwork\\classes\\java\\nio\\channels\\AsynchronousChannelGroup;C:\\Users\\aurora\\sandbox_keepme\\testbase\\test\\java\\nio\\channels\\AsynchronousChannelGroup;C:\\Users\\aurora\\sandbox_keepme\\jdk\\lib\\tools.jar' \\
    'C:\\Users\\aurora\\sandbox_keepme\\jdk\\bin\\java' \\
        -Dtest.vm.opts='-ea -esa -Xmx512m' \\
        -Dcompile.jdk='C:\\Users\\aurora\\sandbox_keepme\\jdk' \\
        -Dtest.src.path='C:\\Users\\aurora\\sandbox_keepme\\testbase\\test\\java\\nio\\channels\\AsynchronousChannelGroup' \\
        -Dtest.src='C:\\Users\\aurora\\sandbox_keepme\\testbase\\test\\java\\nio\\channels\\AsynchronousChannelGroup' \\
        -Dtest.tool.vm.opts='-J-ea -J-esa -J-Xmx512m' \\
        -Dtest.class.path='C:\\Users\\aurora\\sandbox_keepme\\results\\run_59\\testoutput\\jdk_nio\\JTwork\\classes\\java\\nio\\channels\\AsynchronousChannelGroup' \\
        -Dtest.timeout.factor=4.0 \\
        -Dtest.classes='C:\\Users\\aurora\\sandbox_keepme\\results\\run_59\\testoutput\\jdk_nio\\JTwork\\classes\\java\\nio\\channels\\AsynchronousChannelGroup' \\
        -Dtest.class.path.prefix='C:\\Users\\aurora\\sandbox_keepme\\results\\run_59\\testoutput\\jdk_nio\\JTwork\\classes\\java\\nio\\channels\\AsynchronousChannelGroup;C:\\Users\\aurora\\sandbox_keepme\\testbase\\test\\java\\nio\\channels\\AsynchronousChannelGroup' \\
        -Dtest.jdk='C:\\Users\\aurora\\sandbox_keepme\\jdk' \\
        -Dtest.java.opts= \\
        -Dtest.compiler.opts= \\
        -ea -esa -Xmx512m -XX:-UseVMInterruptibleIO \\
        com.sun.javatest.regtest.MainWrapper 'C:\\Users\\aurora\\sandbox_keepme\\results\\run_59\\testoutput\\jdk_nio\\JTwork\\classes\\java\\nio\\channels\\AsynchronousChannelGroup\\Basic.jta'
result: Failed. Execution failed: `main' threw exception: java.lang.RuntimeException: Group should have terminated


test result: Failed. Execution failed: `main' threw exception: java.lang.RuntimeException: Group should have terminated