netdev - Re: TCP connection/socket gets stuck - Customer requests are dropped with SocketTimeoutException

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Message-ID: <CANn89iKy+jvfifGQX8EBomWmhzQnn7j7q39uqd23NX0vvk1nFQ@mail.gmail.com>
Date: Wed, 10 Sep 2025 03:16:01 -0700
From: Eric Dumazet <edumazet@...gle.com>
To: Ramakant Badolia <Ramakant.Badolia@...tom.com>
Cc: "ncardwell@...gle.com" <ncardwell@...gle.com>, "kuniyu@...gle.com" <kuniyu@...gle.com>, 
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>, Ozan Sengul <Ozan.Sengul@...tom.com>, 
	Raja Sekhar Pula Venkata <RAJASEKHAR.PULAVENKATA@...tom.com>, 
	Jean-Christophe Duberga <Jean-Christophe.Duberga@...tom.com>
Subject: Re: TCP connection/socket gets stuck - Customer requests are dropped
 with SocketTimeoutException

On Wed, Sep 10, 2025 at 1:49 AM Ramakant Badolia
<Ramakant.Badolia@...tom.com> wrote:
>
> Hi Linux TCP Maintainers,
>
> I am writing to get insight on this bug report - https://bugzilla.kernel.org/show_bug.cgi?id=219221
> Unfortunately, we at TomTom have also been stuck with this issue for the last two months and our customer requests are getting dropped intermittently several times a day.
>
> Currently we are using Linux version 5.14.0-570.37.1.el9_6.x86_64 which is causing this issue.
>
> As reported in https://bugzilla.kernel.org/show_bug.cgi?id=219221, we don't have possibility to rollback to previous working version.
>
> I want to check if you acknowledged this bug and what solution was provided? Which version should we switch to in order to have this fixed?
>

No idea. This might be a question for Redhat support ?

I do not think you shared a pcap with us ?

Make sure to not force too small SO_RCVBUF values, because too small
values are not very well supported.

Even if we 'fixed' linux, performance would be extremely bad.

This is a random guess, based on the known 'issues' some folks have
with 'TCP stack'


> Best Regards,
> Ramakant Badolia / Engineer IV - Software / PU Traffic and Travel Information (TTI) / Perseus Team / +49 (0) 1793792612 mobile / ramakant.badolia@...tom.com / www.tomtom.com