http://mail.openjdk.java.net/pipermail/hotspot-compiler-dev/2017-May/026232.html

I tried to disassemble JVMCI installed code via hsdis.
It works but I got duplicate output from hsdis.

How to reproduce:

   1. Clone reproducer from GitHub
        https://github.com/YaSuenag/jdt-2017-examples

   2. Copy some files from hotspot testcase
        Please read README.md in this repository.

   3. Edit Makefile to use hsdis
        - code-injection/Makefile
        - Enable UnlockDiagnosticVMOptions and CompilerDirectivesFile

   4. Deploy hsdis to JDK 9 EA b169

   5. Run reproducer
        $ make JAVA_HOME=/path/to/jdk9 syscall


hsdis is called from JVMCIEnv::register_method() and CodeInstaller::install().
So we get same output from hsdis twice.