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Date: Tue, 18 Nov 2025 07:13:02 -0800
From: Jakub Kicinski <kuba@kernel.org>
To: Hangbin Liu <liuhangbin@gmail.com>
Cc: netdev@vger.kernel.org
Subject: Re: [TEST] bond_macvlan_ipvlan.sh flakiness
Message-ID: <20251118071302.5643244a@kernel.org>
In-Reply-To: <aRwMJWzy6f1OEUdy@fedora>
References: <20251114082014.750edfad@kernel.org>
	<aRrbvkW1_TnCNH-y@fedora>
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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.