Re: [PATCH net-next v2 0/7] selftests/net: Mixed select()+polling mode for TCP-AO tests

[Dmitry Safonov]

On Tue, 25 Mar 2025 at 13:15, Jakub Kicinski <kuba@xxxxxxxxxx> wrote:
>
> On Wed, 19 Mar 2025 03:13:33 +0000 Dmitry Safonov via B4 Relay wrote:
> > Should fix flaky tcp-ao/connect-deny-ipv6 test.
> > Begging pardon for the delay since the report and for sending it this
> > late in the release cycle.
>
> Better late than never, thanks a lot! :)

Thank you, Jakub!

I also noticed that recently, self-connect-ipv6 became slightly flaky:
https://netdev.bots.linux.dev/flakes.html?br-cnt=75&tn-needle=tcp-ao

Seems unrelated to select()+poll selftests changes, but rather to
timings in the kernel:
# # 1249[lib/proc.c:213]    Snmp6            Ip6OutNoRoutes: 0 => 1

It seems that the test relied on kernel adding a link-local route with
a loopback interface, but probably adding the interface got faster.
Seems like a trivial two-line fix by manually adding the link-local
route in userspace. Though, can't reproduce that flake locally on
thousands of runs.

Should I send the potential fix now for -net or wait until the merge
window closes and send for -net-next?

Thanks,
             Dmitry