We are sending packets with the same source and destination mac address:

table=86, n_packets=170597, n_bytes=16314704, priority=550,nsi=255,nsp=20 actions=load:0xfe163e0c18ee->NXM_NX_ENCAP_ETH_SRC[],load:0xfa163e0c18ee->NXM_NX_ENCAP_ETH_DST[],goto_table:87

That makes vxlan_tool crazy, which starts to consume its own generated packets creating a very ugly loop