When deleting a specific FDIR rule (see the last rule below), testpmd will get stuck.

To reproduce:

- Run testpmd:
testpmd -n 4  -w 0000:00:05.0 -w 0000:00:06.0 -- -i  --rxq=2 --txq=2 --pkt-filter-mode perfect

- Run the following commands in testpmd. The last one will cause testpmd to get stuck, but I wasn't able to get a trace:
"""
port stop all
flow_director_mask 0 mode IP vlan 0 src_mask 0.0.0.0 ffff:ffff:ffff:ffff:ffff:0:0:0 0xfff0 dst_mask 0.0.0.0 ffff:ffff:ffff:ffff:ffff:0:0:0 0xff00
flow_director_mask 1 mode IP vlan 0 src_mask 0.0.0.0 ffff:ffff:ffff:ffff:ffff:0:0:0 0xfff0 dst_mask 0.0.0.0 ffff:ffff:ffff:ffff:ffff:0:0:0 0xff00
port start all
start

flow_director_filter 0 mode IP add flow ipv6-tcp src ::a209 27758 dst ::1805 12298 tos 0 ttl 0 vlan 0x0 flexbytes (0x0,0x0) fwd pf queue 1 fd_id 1
flow_director_filter 1 mode IP add flow ipv6-tcp src ::a209 27758 dst ::1805 12298 tos 0 ttl 0 vlan 0x0 flexbytes (0x0,0x0) fwd pf queue 1 fd_id 1
flow_director_filter 0 mode IP add flow ipv6-udp src ::ff08 40983 dst ::268e 19741 tos 0 ttl 0 vlan 0x0 flexbytes (0x0,0x0) fwd pf queue 0 fd_id 1
flow_director_filter 1 mode IP add flow ipv6-udp src ::ff08 40983 dst ::268e 19741 tos 0 ttl 0 vlan 0x0 flexbytes (0x0,0x0) fwd pf queue 0 fd_id 1
flow_director_filter 0 mode IP add flow ipv4-other src 0.143.50.94 286 dst 107.219.10.119 55222 tos 0 ttl 0 vlan 0x0 flexbytes (0x0,0x0) drop pf queue 1 fd_id 1
flow_director_filter 1 mode IP add flow ipv4-other src 0.143.50.94 286 dst 107.219.10.119 55222 tos 0 ttl 0 vlan 0x0 flexbytes (0x0,0x0) drop pf queue 1 fd_id 1
flow_director_filter 0 mode IP add flow ipv6-udp src ::cff5 26958 dst ::f978 6084 tos 0 ttl 0 vlan 0x0 flexbytes (0x0,0x0) fwd pf queue 1 fd_id 1
flow_director_filter 1 mode IP add flow ipv6-udp src ::cff5 26958 dst ::f978 6084 tos 0 ttl 0 vlan 0x0 flexbytes (0x0,0x0) fwd pf queue 1 fd_id 1
flow_director_filter 0 mode IP add flow ipv6-udp src ::3962 29380 dst ::4fd0 40864 tos 0 ttl 0 vlan 0x0 flexbytes (0x0,0x0) fwd pf queue 0 fd_id 1
flow_director_filter 1 mode IP add flow ipv6-udp src ::3962 29380 dst ::4fd0 40864 tos 0 ttl 0 vlan 0x0 flexbytes (0x0,0x0) fwd pf queue 0 fd_id 1
flow_director_filter 0 mode IP add flow ipv4-other src 252.195.129.146 26073 dst 15.5.47.129 7690 tos 0 ttl 0 vlan 0x0 flexbytes (0x0,0x0) drop pf queue 0 fd_id 1
flow_director_filter 1 mode IP add flow ipv4-other src 252.195.129.146 26073 dst 15.5.47.129 7690 tos 0 ttl 0 vlan 0x0 flexbytes (0x0,0x0) drop pf queue 0 fd_id 1
flow_director_filter 0 mode IP add flow ipv6-udp src ::971a 40172 dst ::44a7 35151 tos 0 ttl 0 vlan 0x0 flexbytes (0x0,0x0) fwd pf queue 0 fd_id 1
flow_director_filter 1 mode IP add flow ipv6-udp src ::971a 40172 dst ::44a7 35151 tos 0 ttl 0 vlan 0x0 flexbytes (0x0,0x0) fwd pf queue 0 fd_id 1
flow_director_filter 0 mode IP add flow ipv6-udp src ::9e3 5063 dst ::72e8 58832 tos 0 ttl 0 vlan 0x0 flexbytes (0x0,0x0) fwd pf queue 0 fd_id 1
flow_director_filter 1 mode IP add flow ipv6-udp src ::9e3 5063 dst ::72e8 58832 tos 0 ttl 0 vlan 0x0 flexbytes (0x0,0x0) fwd pf queue 0 fd_id 1
flow_director_filter 0 mode IP add flow ipv6-udp src ::4b1d 38458 dst ::6689 52498 tos 0 ttl 0 vlan 0x0 flexbytes (0x0,0x0) fwd pf queue 0 fd_id 1
flow_director_filter 1 mode IP add flow ipv6-udp src ::4b1d 38458 dst ::6689 52498 tos 0 ttl 0 vlan 0x0 flexbytes (0x0,0x0) fwd pf queue 0 fd_id 1
flow_director_filter 0 mode IP add flow ipv6-udp src ::ebb9 32643 dst ::514 2600 tos 0 ttl 0 vlan 0x0 flexbytes (0x0,0x0) fwd pf queue 0 fd_id 1
flow_director_filter 1 mode IP add flow ipv6-udp src ::ebb9 32643 dst ::514 2600 tos 0 ttl 0 vlan 0x0 flexbytes (0x0,0x0) fwd pf queue 0 fd_id 1

flow_director_filter 0 mode IP del flow ipv6-tcp src ::a209 27758 dst ::1805 12298 tos 0 ttl 0 vlan 0x0 flexbytes (0x0,0x0) fwd pf queue 1 fd_id 1
flow_director_filter 1 mode IP del flow ipv6-tcp src ::a209 27758 dst ::1805 12298 tos 0 ttl 0 vlan 0x0 flexbytes (0x0,0x0) fwd pf queue 1 fd_id 1
flow_director_filter 0 mode IP del flow ipv6-udp src ::ff08 40983 dst ::268e 19741 tos 0 ttl 0 vlan 0x0 flexbytes (0x0,0x0) fwd pf queue 0 fd_id 1
flow_director_filter 1 mode IP del flow ipv6-udp src ::ff08 40983 dst ::268e 19741 tos 0 ttl 0 vlan 0x0 flexbytes (0x0,0x0) fwd pf queue 0 fd_id 1
flow_director_filter 0 mode IP del flow ipv4-other src 0.143.50.94 286 dst 107.219.10.119 55222 tos 0 ttl 0 vlan 0x0 flexbytes (0x0,0x0) drop pf queue 1 fd_id 1
flow_director_filter 1 mode IP del flow ipv4-other src 0.143.50.94 286 dst 107.219.10.119 55222 tos 0 ttl 0 vlan 0x0 flexbytes (0x0,0x0) drop pf queue 1 fd_id 1
flow_director_filter 0 mode IP del flow ipv6-udp src ::cff5 26958 dst ::f978 6084 tos 0 ttl 0 vlan 0x0 flexbytes (0x0,0x0) fwd pf queue 1 fd_id 1
flow_director_filter 1 mode IP del flow ipv6-udp src ::cff5 26958 dst ::f978 6084 tos 0 ttl 0 vlan 0x0 flexbytes (0x0,0x0) fwd pf queue 1 fd_id 1
flow_director_filter 0 mode IP del flow ipv6-udp src ::3962 29380 dst ::4fd0 40864 tos 0 ttl 0 vlan 0x0 flexbytes (0x0,0x0) fwd pf queue 0 fd_id 1
flow_director_filter 1 mode IP del flow ipv6-udp src ::3962 29380 dst ::4fd0 40864 tos 0 ttl 0 vlan 0x0 flexbytes (0x0,0x0) fwd pf queue 0 fd_id 1
flow_director_filter 0 mode IP del flow ipv4-other src 252.195.129.146 26073 dst 15.5.47.129 7690 tos 0 ttl 0 vlan 0x0 flexbytes (0x0,0x0) drop pf queue 0 fd_id 1
"""

This also reproduces in newer releases that still have legacy FDIR filter type support.

NIC: ConnectX-5
OFED: MLNX_OFED_LINUX-5.2-1.0.4.0
Firmware version: 16.29.1016

OS: RHEL 7.4
Kernel: 3.10.0-693.el7.x86_64
gcc: 4.8.5