OSPF6 stops accepting HELLO packets

[DarkAngel76]

Description

Hi,
I'm using FRR 8.4.4 on Debian 12 and I want to use ospf6 in a VRF. It works so far but after some minutes the process stops accepting HELLO packets. I can see them with tcpdump. The neighbors only come up again after clearing the process or each interface.

Version

FRRouting 8.4.4 (wg-bgpdiv) on Linux(6.1.0-31-amd64).
Copyright 1996-2005 Kunihiro Ishiguro, et al.
configured with:
    '--build=x86_64-linux-gnu' '--prefix=/usr' '--includedir=${prefix}/include' '--mandir=${prefix}/share/man' '--infodir=${prefix}/share/info' '--sysconfdir=/etc' '--localstatedir=/var' '--disable-option-checking' '--disable-silent-rules' '--libdir=${prefix}/lib/x86_64-linux-gnu' '--libexecdir=${prefix}/lib/x86_64-linux-gnu' '--disable-maintainer-mode' '--localstatedir=/var/run/frr' '--sbindir=/usr/lib/frr' '--sysconfdir=/etc/frr' '--with-vtysh-pager=/usr/bin/pager' '--libdir=/usr/lib/x86_64-linux-gnu/frr' '--with-moduledir=/usr/lib/x86_64-linux-gnu/frr/modules' '--disable-dependency-tracking' '--enable-rpki' '--disable-scripting' '--disable-pim6d' '--with-libpam' '--enable-doc' '--enable-doc-html' '--enable-snmp' '--enable-fpm' '--disable-protobuf' '--disable-zeromq' '--enable-ospfapi' '--enable-bgp-vnc' '--enable-multipath=256' '--enable-user=frr' '--enable-group=frr' '--enable-vty-group=frrvty' '--enable-configfile-mask=0640' '--enable-logfile-mask=0640' 'build_alias=x86_64-linux-gnu' 'PYTHON=python3'

How to reproduce

Interface config:
####Adding VRFs ####
auto vrfTest
iface vrfTest inet manual
pre-up ip link add $IFACE type vrf table 10
up ip link set dev $IFACE up

Add loopback network interface

auto lo1
iface lo1 inet loopback
pre-up ip link add $IFACE type dummy
up ip link set lo1 up
post-up ip link set $IFACE master vrfTest

The network interfaces

auto ens224
iface ens224 inet static
address xx.xx.126.22
netmask 255.255.255.252
pre-up ip link set $IFACE master vrfTest

iface ens224 inet6 static
address xxxx:xxxx:xxxx:51::2/64
#pre-up ip link set $IFACE master vrfTest

OSPF6 config:
interface ens224
ipv6 ospf6 area 0.0.4.2
exit
!
!
interface ens256
ipv6 ospf6 area 0.0.4.2
exit
!
!
interface lo1
ipv6 ospf6 area 0.0.4.2
ipv6 ospf6 passive
exit
!
router ospf6 vrf vrfTest
ospf6 router-id xx.xx.126.241
area 0.0.4.2 stub
exit

Expected behavior

2025-02-21 07:55:40.417 [DEBG] ospf6d: [HEXF0-KA35R] Hello received on ens224
2025-02-21 07:55:40.417 [DEBG] ospf6d: [WT04E-NR4JP] src: fe80::b226:80ff:fe40:9ef0
2025-02-21 07:55:40.417 [DEBG] ospf6d: [K2TW0-CYAQX] dst: ff02::5
2025-02-21 07:55:40.417 [DEBG] ospf6d: [GNVTE-A64WG] OSPFv3 Type:1 Len:40 Router-ID:xx.xx.112.1
2025-02-21 07:55:40.417 [DEBG] ospf6d: [RA6WJ-XZB2C] Area-ID:0.0.4.2 Cksum:896 Instance-ID:0
2025-02-21 07:55:40.417 [DEBG] ospf6d: [K6N0H-3Q3W7] I/F-Id:110 Priority:255 Option:--|-|--|-|-|--|R|-|--|-|V6
2025-02-21 07:55:40.417 [DEBG] ospf6d: [MFC3G-8KW9N] HelloInterval:10 DeadInterval:40
2025-02-21 07:55:40.417 [DEBG] ospf6d: [SMPBA-YB7BT] DR:xx.xx.112.1 BDR:xx.xx.126.241
2025-02-21 07:55:40.417 [DEBG] ospf6d: [TKWAM-D4JS9] Neighbor: xx.xx.126.241

Actual behavior

No HELLO packets received after a while

Additional context

No response

Checklist

• I have searched the open issues for this bug.
• I have not included sensitive information in this report.

[DarkAngel76]

Same behaviour with FRRouting 10.2.1 (wg-bgpdiv) on Linux(6.1.0-31-amd64).