Marcus Wichelmann wrote: > Am 24.02.25 um 16:29 schrieb Marcus Wichelmann: > > [...] > > + /* By default, Linux sends IPv6 multicast listener reports which > > + * interfere with this test. Set the IFF_NOARP flag to ensure > > + * silence on the interface. > > + */ > > + SYS(close, "ip link set dev " RX_NAME " arp off"); > > SYS(close, "ip link set dev " RX_NAME " up"); > > Hm, setting the NOARP flag seems to have not been sufficient to fix the flaky > test: > https://github.com/kernel-patches/bpf/actions/runs/13507111620/job/37739614229 > > I was not able to reproduce it locally or with my own CI runs unfortunately, but > I'll try something else in the next patch version which should definitely stop > IPv6 multicast listener report packets from messing with the tests. You probably want to pass nodad to any ip -6 addr add. This is a common option you'll find in tools/testing/selftests/net. RFC 3810 section 5.2.13 says " For stateless autoconfiguration, as defined in [RFC2462], a node is required to join several IPv6 multicast groups, in order to perform Duplicate Address Detection (DAD). "
