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  1. JDK
  2. JDK-8332388

Incorrect results produced by OpenJDK 8 when set "-XX:-ReduceBulkZeroing" option

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      ADDITIONAL SYSTEM INFORMATION :
      macOS version:
      ```
      Software:

          System Software Overview:

            System Version: macOS 13.2 (22D49)
            Kernel Version: Darwin 22.3.0
            Boot Volume: Macintosh HD
            Boot Mode: Normal
            Computer Name: MacBook Pro
            User Name: MacBook
            Secure Virtual Memory: Enabled
            System Integrity Protection: Enabled
            Time since boot: 1 day, 2 hours, 19 minutes

      Hardware:

          Hardware Overview:

            Model Name: MacBook Pro
            Model Identifier: MacBookPro18,1
            Model Number: MK193CH/A
            Chip: Apple M1 Pro
            Total Number of Cores: 10 (8 performance and 2 efficiency)
            Memory: 16 GB
            System Firmware Version: 8419.80.7
            OS Loader Version: 8419.80.7
            Activation Lock Status: Disabled
      ```

      OpenJDK version:
      ```
      openjdk version "1.8.0_402"
      OpenJDK Runtime Environment (Temurin)(build 1.8.0_402-b06)
      OpenJDK 64-Bit Server VM (Temurin)(build 25.402-b06, mixed mode)
      ```

      A DESCRIPTION OF THE PROBLEM :
      When executing a test program on OpenJDK 8 with the "-XX:-ReduceBulkZeroing" option enabled, incorrect results are observed. However, if the "-XX:-ReduceBulkZeroing" option is removed, the test program runs normally and produces the expected output.

      This bug is specific to OpenJDK 8 and does not affect other versions of the JDK.

      The test program can be found at :

      https://drive.google.com/file/d/1BaMa2lFOlYg9JpD6ILAEYjEFsOQ-pOrg/view?usp=sharing

      **Expected Behavior:**

      The test program should execute normally and output “Finish”.

      **Observed Behavior:**

      The test program produces wrong results, and output:

      ```
              Test m2 failed
              source:
              byte TestInstanceCloneUtils$D.i1 = 0
              short TestInstanceCloneUtils$D.i2 = 1
              long TestInstanceCloneUtils$D.i3 = 2
              int TestInstanceCloneUtils$D.i4 = 3
              int TestInstanceCloneUtils$D.i5 = 4
              result:
              0
              Finish
      ```

      REGRESSION : Last worked in version 11.0.22

      STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
      Please refer to the readme.txt in the attached file.

      EXPECTED VERSUS ACTUAL BEHAVIOR :
      EXPECTED -
      The test program should execute normally and output “Finish”.
      ACTUAL -
      The test program produces wrong results, and output:

      ```
              Test m2 failed
              source:
              byte TestInstanceCloneUtils$D.i1 = 0
              short TestInstanceCloneUtils$D.i2 = 1
              long TestInstanceCloneUtils$D.i3 = 2
              int TestInstanceCloneUtils$D.i4 = 3
              int TestInstanceCloneUtils$D.i5 = 4
              result:
              0
              Finish
      ```

      FREQUENCY : always


            mcadizolivar Mario Cadiz Olivares
            webbuggrp Webbug Group
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              Created:
              Updated:
              Resolved: