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  1. JDK
  2. JDK-8217467

Access barriers are missing in C2 intrinsic for Base64

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      Description

        New Base64 intrinsics code introduced by JDK-8205528 is missing GC interface accesses. This was found in Shenandoah CTW tests:
         https://mail.openjdk.java.net/pipermail/shenandoah-dev/2019-January/008790.html

        It can theoretically affect other GCs as well. C2 interface was introduced in 12, so both 12 and 13 are affected.

        Sample fix:
         http://cr.openjdk.java.net/~shade/shenandoah/fix-base64.patch

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            backported by

            Backport - A issue that is required to port a Bug or Feature into another product release. This issue type is generally associated with the main Bug/Feature to represent each individual release of the port. JDK-8217672 Access barriers are missing in C2 intrinsic for Base64

            • P2 - Crashes, loss of data, severe memory leak.
            • Resolved

            Backport - A issue that is required to port a Bug or Feature into another product release. This issue type is generally associated with the main Bug/Feature to represent each individual release of the port. JDK-8218300 Access barriers are missing in C2 intrinsic for Base64

            • P2 - Crashes, loss of data, severe memory leak.
            • Resolved

            Backport - A issue that is required to port a Bug or Feature into another product release. This issue type is generally associated with the main Bug/Feature to represent each individual release of the port. JDK-8218348 Access barriers are missing in C2 intrinsic for Base64

            • P2 - Crashes, loss of data, severe memory leak.
            • Resolved
            relates to

            Enhancement - null JDK-8210187 Explicit barriers for C2

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • Resolved

            Enhancement - null JDK-8205528 Base64 encoding algorithm using AVX512 instructions

            • P3 - Major loss of function.
            • Resolved

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                shade Aleksey Shipilev
                shade Aleksey Shipilev
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                  Updated:
                  Resolved: