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  1. JDK
  2. JDK-8300025

Inconsistent output in JDK compared to openJ9

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Details

    • Bug
    • Resolution: Not an Issue
    • P4
    • None
    • 8, 11, 17, 19, 20
    • tools
    • generic
    • generic

    Description

      ADDITIONAL SYSTEM INFORMATION :
      openjdk version "11.0.17" 2022-10-18
      OpenJDK Runtime Environment Temurin-11.0.17+8 (build 11.0.17+8)
      OpenJDK 64-Bit Server VM Temurin-11.0.17+8 (build 11.0.17+8, mixed mode)

      openjdk version "1.8.0_352"
      OpenJDK Runtime Environment (Temurin)(build 1.8.0_352-b08)
      OpenJDK 64-Bit Server VM (Temurin)(build 25.352-b08, mixed mode)

      A DESCRIPTION OF THE PROBLEM :
      Given the test program ChecksumDiff01.java, both hotspot, openj9 and graalvm give the correct output, which was -34400. However, if we convert this program into jasm code (can be found in ChecksumDiff01.jasm), openj9 can give a consistent output -34400, while hotspot and graalvm give a different output, which is 96672.

      Test Program: https://drive.google.com/file/d/1Yw7iAxOYZbzoRI-IdmOQSDdBx8uLs5aH/view?usp=sharing

      The test program was simplified by the developer of OpenJ9, more details can be found in: https://github.com/eclipse-openj9/openj9/issues/16498


      STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
      First step:
      javac ChecksumDiff01.java
      java -cp . ChecksumDiff01

      We can get the correct output:-34400


      Second step:
      java -jar lib/asmtools.jar jasm ChecksumDiff01.jasm
      java -cp . ChecksumDiff01

      We will get the wrong output: 96672


      FREQUENCY : always


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            webbuggrp Webbug Group
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              Updated:
              Resolved: