I can reproduce it every time on a OEL 6.4 32 bit environment. It passed on other Ubuntu 32 bit envs. Since there is one OEL 32 bit env, I'm not sure if it is env specific or OS/arch specific.

Please refer to the test output. It didn't provide much information:
----------System.out:(2/465)----------
Command line: [/Users/aurora/CommonData/jdk/bin/java -ms8m jdk.tools.jimage.Main extract --dir /Users/aurora/sandbox/gresults/testoutput/jdk_lang/JTwork/scratch/./extract /Users/aurora/CommonData/jdk/lib/modules ]
Command line: [/Users/aurora/CommonData/jdk/bin/java -ms8m jdk.tools.jimage.Main recreate --dir /Users/aurora/sandbox/gresults/testoutput/jdk_lang/JTwork/scratch/./extract /Users/aurora/sandbox/gresults/testoutput/jdk_lang/JTwork/scratch/./recreate ]
----------System.err:(13/758)----------
java.lang.RuntimeException: JImageToolTest FAILED
at JImageToolTest.jimage(JImageToolTest.java:53)
at JImageToolTest.main(JImageToolTest.java:69)
at sun.reflect.NativeMethodAccessorImpl.invoke0(java.base@9-ea/Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(java.base@9-ea/NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(java.base@9-ea/DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(java.base@9-ea/Method.java:531)
at com.sun.javatest.regtest.agent.MainActionHelper$SameVMRunnable.run(MainActionHelper.java:226)
at java.lang.Thread.run(java.base@9-ea/Thread.java:804)