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  1. JDK
  2. JDK-8058847

C2: EliminateAutoBox regression after 8042786

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    Details

    • Type: Bug
    • Status: Closed
    • Priority: P2
    • Resolution: Fixed
    • Affects Version/s: 8u40, 9
    • Fix Version/s: 9
    • Component/s: hotspot
    • Labels:
    • Subcomponent:
    • Introduced In Build:
      b15
    • Introduced In Version:
      9
    • Resolved In Build:
      b40
    • CPU:
      x86_64
    • Verification:
      Verified

      Backports

        Description

        Originally reported at http://stackoverflow.com/questions/25942010/how-is-arrayoutofboundsexception-possible-in-string-valueofint

        The following test case crashes JVM when it should normally runs forever.

        public class EliminateAutoBoxCrash {
            private static final int[] values = new int[256];

            public static void main(String[] args) {
                byte[] bytes = new byte[] {-1};
                while (true) {
                    for (Byte b : bytes) {
                        values[b & 0xff]++;
                    }
                }
            }
        }

        Note autoboxing: Byte b.
        Workaround: -XX:-EliminateAutoBox

        Initial investigation shows that the bug has been introduced with the fix for JDK-8042786.

          Attachments

          1. hs_err_pid5757.log
            30 kB
            Andrei Pangin
          2. igvn_autobox_elimination.png
            38 kB
            Vladimir Ivanov

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                Assignee:
                vlivanov Vladimir Ivanov
                Reporter:
                apangin Andrei Pangin
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                  Dates

                  Created:
                  Updated:
                  Resolved: