Comment 4 for bug 1799397

copy&paste interim summary from upstream thread

Summary:
        - CPU: Intel Skylake
        - Linux environment: Ubuntu 18.04
        - Compiler: GCC 7 or 8
        - Scenario: testpmd crashes when it starts forwarding
        - Behaviour: AVX2 version of rte_memcpy() fails if optimized for AVX512
        - Context: inline rte_memcpy() is called from
                        inline rte_mempool_put_bulk(), called from
                        mlx5_tx_complete() (inline or not)
        - Analysis: AVX512 optimization changes vmovdqu to vmovdqu8

Latest status can be found in Bugzilla:
        https://bugs.dpdk.org/show_bug.cgi?id=97#c35