tools/jimage/JImageExtractTest.java fails intermittently at testExtract (osx-x64, run with -conc:6)

----------System.out:(6/320)----------
Invoking testExtractToDir
jimage [extract, --dir, ./JImageExtractTest2369491764840834267, /Users/aurora/sandbox_keepme/jdk/lib/modules]
Invoking testExtractNotAnImage
jimage [extract, ./JImageExtractTest2759577580748474434not_an_image]
Invoking testExtract
jimage [extract, /Users/aurora/sandbox_keepme/jdk/lib/modules]
----------System.err:(24/1672)----------
java.lang.reflect.InvocationTargetException
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at JImageCliTest.runTests(JImageCliTest.java:111)
at JImageExtractTest.main(JImageExtractTest.java:183)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:115)
at java.base/java.lang.Thread.run(Thread.java:841)
Caused by: java.lang.RuntimeException: There are no exploded modules with missing 'module-info.class': expected [./JImageExtractTest2369491764840834267, ./JImageExtractTest2759577580748474434not_an_image, .] to equal [.]
at jdk.test.lib.Asserts.fail(Asserts.java:594)
at jdk.test.lib.Asserts.assertEquals(Asserts.java:205)
at JImageExtractTest.verifyExplodedImage(JImageExtractTest.java:178)
at JImageExtractTest.testExtract(JImageExtractTest.java:55)
... 12 more

JavaTest Message: Test threw exception: java.lang.reflect.InvocationTargetException
JavaTest Message: shutting down test

STATUS:Failed.`main' threw exception: java.lang.reflect.InvocationTargetException