kni cause a kernel crash on avx512 supported platform with gcc 8.3.1

https://bugs.dpdk.org/show_bug.cgi?id=249

            Bug ID: 249
           Summary: kni cause a kernel crash on avx512 supported platform
                    with gcc 8.3.1
           Product: DPDK
           Version: 18.11
          Hardware: All
                OS: All
            Status: CONFIRMED
          Severity: normal
          Priority: Normal
         Component: core
          Assignee: [email protected]
          Reporter: [email protected]

Target Milestone: ---

The reason of the crash looks like kni library is filling the rx_q with wrong values.

This only happens on SkyLake platform when avx512 is enabled, disabling the avx512 via "-mno-avx512f" prevents the crash, also using clang (7.0.1) prevents the issue although it generates avx512 code.

For reference, binutils version: 2.31.1-24.fc29

At first glance suspected instruction is 'vpgatherqq' but it needs to be debugged more. Also will submit a defect to gcc.

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