frr log doesn't show line number of source file

[weisuofayubc]

2025/05/04 17:10:59 ZEBRA: [KKAC1-JMWTB] Rx RTM_NEWNEIGH family ipv4 IF virbr0(7) vrf default(0) IP 23.98.189.39 MAC  state 0x20 flags 0x0 ext_flags 0x0
2025/05/04 17:10:59 ZEBRA: [NR6MZ-KY8YF] zebra neigh del if virbr0/7 23.98.189.39
2025/05/04 17:10:59 ZEBRA: [KMXEB-K771Y] netlink_parse_info: netlink-listen (NS 0) type RTM_NEWNEIGH(28), len=64, seq=0, pid=0
2025/05/04 17:10:59 ZEBRA: [KKAC1-JMWTB] Rx RTM_NEWNEIGH family ipv4 IF docker0(6) vrf default(0) IP 23.98.189.39 MAC  state 0x20 flags 0x0 ext_flags 0x0
2025/05/04 17:10:59 ZEBRA: [NR6MZ-KY8YF] zebra neigh del if docker0/6 23.98.189.39
2025/05/04 17:10:59 ZEBRA: [KMXEB-K771Y] netlink_parse_info: netlink-listen (NS 0) type RTM_NEWNEIGH(28), len=64, seq=0, pid=0
2025/05/04 17:10:59 ZEBRA: [KKAC1-JMWTB] Rx RTM_NEWNEIGH family ipv4 IF virbr0(7) vrf default(0) IP 124.71.85.133 MAC  state 0x20 flags 0x0 ext_flags 0x0
2025/05/04 17:10:59 ZEBRA: [NR6MZ-KY8YF] zebra neigh del if virbr0/7 124.71.85.133
2025/05/04 17:10:59 ZEBRA: [KMXEB-K771Y] netlink_parse_info: netlink-listen (NS 0) type RTM_NEWNEIGH(28), len=64, seq=0, pid=0
2025/05/04 17:10:59 ZEBRA: [KKAC1-JMWTB] Rx RTM_NEWNEIGH family ipv4 IF docker0(6) vrf default(0) IP 124.71.85.133 MAC  state 0x20 flags 0x0 ext_flags 0x0
2025/05/04 17:10:59 ZEBRA: [NR6MZ-KY8YF] zebra neigh del if docker0/6 124.71.85.133
2025/05/04 17:11:00 ZEBRA: [KMXEB-K771Y] netlink_parse_info: netlink-listen (NS 0) type RTM_NEWNEIGH(28), len=64, seq=0, pid=0
2025/05/04 17:11:00 ZEBRA: [TDS34-MNEJW]     Neighbor Entry received is not on a VLAN or a BRIDGE, ignoring
2025/05/04 17:11:00 ZEBRA: [KKAC1-JMWTB] Rx RTM_NEWNEIGH family ipv4 IF ztc3qw4fhf(8) vrf default(0) IP 192.168.195.22 MAC  state 0x20 flags 0x0 ext_flags 0x0
2025/05/04 17:11:00 ZEBRA: [NR6MZ-KY8YF] zebra neigh del if ztc3qw4fhf/8 192.168.195.22

It shows random string "NR6MZ-KY8YF" instead of source file line number, this is hard to debug.
Can it show source file and line number?

[eqvinox]

Existing approaches:

• You can get file name & line number by using systemd / journald log, it shows there as metadata
• Alternatively, you can find frr.xref in your build directory after building FRR:
  • if you use vim/nvim editor, you can load tools/frr.vim and then use :FRRGotoXref NR6MZ-KY8YF

$ jq '.refs.["NR6MZ-KY8YF"]' frr.xref 
[
  {
    "args": "ifp->name, ifp->ifindex, ip",
    "binary": "zebra/zebra",
    "file": "zebra/zebra_neigh.c",
    "fmtstring": "zebra neigh del if %s/%d %pIA",
    "func": "zebra_neigh_del",
    "line": 144,
    "priority": 7,
    "type": "logmsg"
  }
]

We can certainly also add a config option to print file name / line number in all messages, though this likely wouldn't be enabled by default.

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