In CSIT we are experiencing issue with L2 patch tests. Traffic sent to VPP with l2patch configured, is causing VPP restart. There is no core dump generated during restart (iow this is not a crash). 

PAPI configuration:

sw_interface_set_flags(flags=1,sw_if_index=1)
sw_interface_set_flags(flags=1,sw_if_index=2)
hw_interface_set_mtu(sw_if_index=1,mtu=9200)
hw_interface_set_mtu(sw_if_index=2,mtu=9200)
l2_patch_add_del(rx_sw_if_index=1,is_add=1,tx_sw_if_index=2)
l2_patch_add_del(rx_sw_if_index=2,is_add=1,tx_sw_if_index=1)

There is no log from VPP and only one single packet is enough to VPP to restart.

VPP version: 20.01-rc0~453-g349cd1af7