Fire up VPP, fire up vppctl.

Run this one command:

vpp# map params pre-resolve ip4-nh 1.2.3.4 del

#0 0x00007ffff77632d1 in fib_node_child_remove (parent_type=<optimized out>,
parent_index=<optimized out>, sibling_index=0)
at /usr/src/debug/vpp-19.01/src/vnet/fib/fib_node.c:131
#1 0x00007ffff77652f6 in fib_entry_child_remove (fib_entry_index=4294967295,
sibling_index=<optimized out>) at /usr/src/debug/vpp-19.01/src/vnet/fib/fib_entry.c:569
#2 0x00007fffaf953fef in map_fib_unresolve (pr=pr@entry=0x7fffafb60380 <pre_resolved>,
proto=proto@entry=FIB_PROTOCOL_IP4, len=len@entry=32 ' ', addr=addr@entry=0x7fffb4f54ba0)
at /home/jdl/workspace/tnsr-pkgs/work/vpp/build-root/rpmbuild/vpp-19.01/src/plugins/map/map.c:433
#3 0x00007fffaf95771e in map_pre_resolve (ip4=0x7fffb4f54bec, ip6=<optimized out>, is_del=1)
at /home/jdl/workspace/tnsr-pkgs/work/vpp/build-root/rpmbuild/vpp-19.01/src/plugins/map/map.c:464
#4 0x00007fffaf95782e in map_pre_resolve_command_fn (vm=<optimized out>, input=<optimized out>,
cmd=<optimized out>)

122 void
123 fib_node_child_remove (fib_node_type_t parent_type,
124 fib_node_index_t parent_index,
125 fib_node_index_t sibling_index)
126 {
127 fib_node_t *parent;
128
129 parent = fn_vfts[parent_type].fnv_get(parent_index);
130
131 fib_node_list_remove(parent->fn_children, sibling_index);
132
133 if (0 == fib_node_list_get_size(parent->fn_children))
134 {
135 fib_node_list_destroy(&parent->fn_children);