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  1. JDK
  2. JDK-8155635

C2: Mixed unsafe oop accesses break alias analysis

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Details

    • Bug
    • Resolution: Fixed
    • P1
    • 9
    • 9
    • hotspot
    • b137
    • Verified

    Backports

      Description

        Unsafe accesses can produce untyped pointers:

        # Internal Error (/Users/vlivanov/ws/jdk/hs-comp9/hotspot/src/share/vm/opto/compile.cpp:1712), pid=61943, tid=22531
        # assert(flat != TypePtr::BOTTOM) failed: cannot alias-analyze an untyped ptr

        ILW = MLH = P4
        I = M: assert
        L = L: observed only with modified JVM
        W = H: no workaround

        Attachments

          1. hs_err_pid61987.log
            64 kB
            Vladimir Ivanov
          2. SplitIf.AddPNode.png
            44 kB
            Vladimir Ivanov

          Issue Links

            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-8214626 C2: Mixed unsafe oop accesses break alias analysis

            • P1 - Blocks development and/or testing work, production could not run.
            • 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-8220879 C2: Mixed unsafe oop accesses break alias analysis

            • P1 - Blocks development and/or testing work, production could not run.
            • 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-8181822 C2: Mixed unsafe oop accesses break alias analysis

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

            Bug - A problem which impairs or prevents the functions of the product. JDK-8164121 assert(flat != TypePtr::BOTTOM) failed: cannot alias-analyze an untyped ptr

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

            Bug - A problem which impairs or prevents the functions of the product. JDK-8056058 C2 assert: assert(flat != TypePtr::BOTTOM) failed: cannot alias-analyze an untyped ptr when running SPECjbb2013

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

            Bug - A problem which impairs or prevents the functions of the product. JDK-8221355 Performance regression after JDK-8155635 backport into 8u

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

            Bug - A problem which impairs or prevents the functions of the product. JDK-8056058 C2 assert: assert(flat != TypePtr::BOTTOM) failed: cannot alias-analyze an untyped ptr when running SPECjbb2013

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

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                vlivanov Vladimir Ivanov
                vlivanov Vladimir Ivanov
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                Dates

                  Created:
                  Updated:
                  Resolved: