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  1. JDK
  2. JDK-8283249

CompressedClassPointers.java fails on ppc with 'Narrow klass shift: 0' missing

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    • b15
    • ppc

    Backports

      Description

        These tests are highly vulnerable against ASLR. On PPCLE, we apparently don't manage to map the heap into the lower 4G region, therefore CCS does not live there either.

        The test requires for "-UseCompressedOops -Xshare:off" and a heap size of 128m and a ccs size of 1G ccs to live in the lower 4G. That is an optimistic assumption.

        The VM attaches instead CCS to 0x100000000 (4GB) and calculates Narrow Base/Shift as 0/3, which is totally correct.

        As a stop-gap measure, the test should be less strict for PPC.

        A future solution would be to revise this test.

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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-8284174 CompressedClassPointers.java fails on ppc with 'Narrow klass shift: 0' missing

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

            Bug - A problem which impairs or prevents the functions of the product. JDK-8299387 CompressedClassPointers.java still fails on ppc with 'Narrow klass shift: 0' missing

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

            Enhancement - null JDK-8241825 Make compressed oops and compressed class pointers independent (x86_64, PPC, S390)

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

            Commit Commit openjdk/jdk17u-dev/06c955a3

            Commit Commit openjdk/jdk/58487ddc

            Review Review openjdk/jdk17u-dev/330

            Review Review openjdk/jdk/7837

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                stuefe Thomas Stuefe
                stuefe Thomas Stuefe
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                  Updated:
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