8u JPRT test runs are frequently failing with the following error:

java.lang.IndexOutOfBoundsException
at java.io.ByteArrayOutputStream.write(ByteArrayOutputStream.java:151)
at InflateIn_DeflateOut.TestFlushableGZIPOutputStream(InflateIn_DeflateOut.java:179)
at InflateIn_DeflateOut.realMain(InflateIn_DeflateOut.java:311)
at InflateIn_DeflateOut.main(InflateIn_DeflateOut.java:325)
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:498)
at com.sun.javatest.regtest.agent.MainActionHelper$SameVMRunnable.run(MainActionHelper.java:226)
at java.lang.Thread.run(Thread.java:748)
java.lang.AssertionError: Some tests failed
at InflateIn_DeflateOut.main(InflateIn_DeflateOut.java:327)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.sun.javatest.regtest.agent.MainActionHelper$SameVMRunnable.run(MainActionHelper.java:226)
at java.lang.Thread.run(Thread.java:748)

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

InflateIn_DeflateOut is not new but TestFlushableGZIPOutputStream was added pretty recently. I suspect an issue with the testcase itself. So far I have only seen it on ia32 and amd64 Linux. Not sure if this reproduces on JDK 10 or later versions.