Re: [TEST] bond_macvlan_ipvlan.sh flakiness

[Jakub Kicinski <kuba@kernel.org>]

On Tue, 18 Nov 2025 06:03:17 +0000 Hangbin Liu wrote:
> > Hmm, this one is suspicious. I can reproduce the ping fail on local.
> > But no "otherhost" issue. I will check the failure recently.  
> 
> This looks like a time-sensitive issue, with
> 
> diff --git a/tools/testing/selftests/drivers/net/bonding/bond_macvlan_ipvlan.sh b/tools/testing/selftests/drivers/net/bonding/bond_macvlan_ipvlan.sh
> index c4711272fe45..947c85ec2cbb 100755
> --- a/tools/testing/selftests/drivers/net/bonding/bond_macvlan_ipvlan.sh
> +++ b/tools/testing/selftests/drivers/net/bonding/bond_macvlan_ipvlan.sh
> @@ -30,6 +30,7 @@ check_connection()
>         local message=${3}
>         RET=0
> 
> +       sleep 1
>         ip netns exec ${ns} ping ${target} -c 4 -i 0.1 &>/dev/null
>         check_err $? "ping failed"
>         log_test "${bond_mode}/${xvlan_type}_${xvlan_mode}: ${message}"
> 
> I run the test 100 times (vng with 4 cpus) and not able to reproduce it anymore.
> That maybe why debug kernel works good.

I see. I queued up a local change to add a 0.25 sec wait. Let's wait 
a couple of days and see how much sleep we need here, this function 
is called 96 times if I'm counting right.