Subject: Re: [TEST] nft-flowtable-sh flaking after pulling first chunk of the merge window

From: Pablo Neira Ayuso <[email-masked]>
Date: Wed, 29 Jan 2025 12:21:24 +0100

Hi Jakub,

On Thu, Jan 23, 2025 at 08:04:44AM -0800, Jakub Kicinski wrote:
> Hi!
> 
> Could be very bad luck but after we fast forwarded net-next yesterday
> we have 3 failures in less than 24h in nft_flowtabl.sh:
> 
> https://netdev.bots.linux.dev/contest.html?test=nft-flowtable-sh
> 
> # FAIL: flow offload for ns1/ns2 with masquerade and pmtu discovery : original counter  2113852 exceeds expected value 2097152, reply counter  60
> https://netdev-3.bots.linux.dev/vmksft-nf/results/960740/11-nft-flowtable-sh/stdout
> 
> # FAIL: flow offload for ns1/ns2 with masquerade and pmtu discovery : original counter  3530493 exceeds expected value 3478585, reply counter  60
> https://netdev-3.bots.linux.dev/vmksft-nf/results/960022/10-nft-flowtable-sh/stdout

this is reporting a flow in forward chain going over the size of the
file, this is a flow that is not follow flowtable path.

> # FAIL: dscp counters do not match, expected dscp3 and dscp0 > 0 but got  1431 , 0 
> https://netdev-3.bots.linux.dev/vmksft-nf/results/960740/11-nft-flowtable-sh-retry/stdout

this is reporting that occasionally a flow does not follow flowtable
path, dscp3 gets bumped from the forward chain.

I can rarely see this last dscp tests FAIL when running this test in a
loop here.

Just a follow up, I am still diagnosing.