Courtesy of codenomicon ip test case #5737, a single-packet instantaneous vpp kill. Statically reproducible offline by using the packet-generator / pcap files attached to the defect.
Code MUST survive / drop packets, not ASSERT.
DBGvpp# 0: /scratch/dbarach/vpp-bugs/src/vnet/ip/ip4_reassembly.c:103 (ip4_reass_buffer_get_data_len) assertion `vnb->ip.reass.range_last > vnb->ip.reass.fragment_first' fails