linux-kernel - Re: [PATCH] tcp: check socket state before calling WARN

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Message-ID: <Z1KRaD78T3FMffuX@perf>
Date: Fri, 6 Dec 2024 14:53:44 +0900
From: Youngmin Nam <youngmin.nam@...sung.com>
To: Eric Dumazet <edumazet@...gle.com>
Cc: Youngmin Nam <youngmin.nam@...sung.com>, Jakub Kicinski
	<kuba@...nel.org>, Neal Cardwell <ncardwell@...gle.com>,
	davem@...emloft.net, dsahern@...nel.org, pabeni@...hat.com,
	horms@...nel.org, dujeong.lee@...sung.com, guo88.liu@...sung.com,
	yiwang.cai@...sung.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, joonki.min@...sung.com,
	hajun.sung@...sung.com, d7271.choe@...sung.com, sw.ju@...sung.com
Subject: Re: [PATCH] tcp: check socket state before calling WARN_ON

On Wed, Dec 04, 2024 at 08:13:33AM +0100, Eric Dumazet wrote:
> On Wed, Dec 4, 2024 at 4:35 AM Youngmin Nam <youngmin.nam@...sung.com> wrote:
> >
> > On Tue, Dec 03, 2024 at 06:18:39PM -0800, Jakub Kicinski wrote:
> > > On Tue, 3 Dec 2024 10:34:46 -0500 Neal Cardwell wrote:
> > > > > I have not seen these warnings firing. Neal, have you seen this in the past ?
> > > >
> > > > I can't recall seeing these warnings over the past 5 years or so, and
> > > > (from checking our monitoring) they don't seem to be firing in our
> > > > fleet recently.
> > >
> > > FWIW I see this at Meta on 5.12 kernels, but nothing since.
> > > Could be that one of our workloads is pinned to 5.12.
> > > Youngmin, what's the newest kernel you can repro this on?
> > >
> > Hi Jakub.
> > Thank you for taking an interest in this issue.
> >
> > We've seen this issue since 5.15 kernel.
> > Now, we can see this on 6.6 kernel which is the newest kernel we are running.
> 
> The fact that we are processing ACK packets after the write queue has
> been purged would be a serious bug.
> 
> Thus the WARN() makes sense to us.
> 
> It would be easy to build a packetdrill test. Please do so, then we
> can fix the root cause.
> 
> Thank you !
> 

Hi Eric.

Unfortunately, we are not familiar with the Packetdrill test.
Refering to the official website on Github, I tried to install it on my device.

Here is what I did on my local machine.

$ mkdir packetdrill
$ cd packetdrill
$ git clone https://github.com/google/packetdrill.git .
$ cd gtests/net/packetdrill/
$./configure
$ make CC=/home/youngmin/Downloads/arm-gnu-toolchain-13.3.rel1-x86_64-aarch64-none-linux-gnu/bin/aarch64-none-linux-gnu-gcc

$ adb root
$ adb push packetdrill /data/
$ adb shell

And here is what I did on my device

erd9955:/data/packetdrill/gtests/net # ./packetdrill/run_all.py -S -v -L -l tcp/
/system/bin/sh: ./packetdrill/run_all.py: No such file or directory

I'm not sure if this procedure is correct.
Could you help us run the Packetdrill on an Android device ?