[Bug 4] Segfault while running txonly mode with 4 16B SGEs packets

[Bug 4] Segfault while running txonly mode with 4 16B SGEs packets

[bugzilla]

http://dpdk.org/tracker/show_bug.cgi?id=4

            Bug ID: 4
           Summary: Segfault while running txonly mode with 4 16B SGEs
                    packets
           Product: DPDK
           Version: 17.08
          Hardware: x86
                OS: Linux
            Status: CONFIRMED
          Severity: major
          Priority: Normal
         Component: testpmd
          Assignee: dev@dpdk.org
          Reporter: salehals@mellanox.com
  Target Milestone: ---

Testpmd crashes when any segment size is <= 18 bytes

testpmd command:
./x86_64-native-linuxapp-gcc/build/app/test-pmd/testpmd c 0x003f -n 4 --no-pci
--vdev net_ring0 --vdev net_ring1 -- --burst=64 --mbcache=512 --portmask 0x3 -i
--txd=1024 --rxd=256 --rxq=1 --txq=1 --coremask 0x001e --disable-crc-strip
--forward-mode=txonly --txpkts=16,16,16,16 -a

Trace:
#0 0x0000000000475698 in pkt_burst_transmit ()
#1 0x000000000045713a in run_pkt_fwd_on_lcore ()
#2 0x0000000000457244 in start_pkt_forward_on_core ()
#3 0x00000000004b9994 in eal_thread_loop ()
#4 0x00007ffff7093e25 in start_thread () from /lib64/libpthread.so.0
#5 0x00007ffff6dc134d in clone () from /lib64/libc.so.6

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