netdev - Re: kernel BUG at net/ipv4/tcp_output.c:2642 with kernel 5.19.0-rc2 and newer

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Date: Mon, 16 Oct 2023 13:17:51 +0200
From: Eric Dumazet <edumazet@...gle.com>
To: Dmitry Kravkov <dmitryk@...lt.com>
Cc: Kuniyuki Iwashima <kuniyu@...zon.com>, netdev@...r.kernel.org, slavas@...lt.com
Subject: Re: kernel BUG at net/ipv4/tcp_output.c:2642 with kernel 5.19.0-rc2
 and newer

On Mon, Oct 16, 2023 at 1:13 PM Eric Dumazet <edumazet@...gle.com> wrote:
>
> On Mon, Oct 16, 2023 at 1:10 PM Dmitry Kravkov <dmitryk@...lt.com> wrote:
>
> > Hi Eric, do you think we can try something to avoid the crash?
> > Decreasing tcp_wmem[0] did not help
> > # cat /proc/sys/net/ipv4/tcp_wmem
> > 4096 1048576 629145
> >
> >
>
> Honestly I have no idea, it seems strange that you are the only one to
> hit such a bug.

Please tell us which Congestion Control module and qdisc you use.

If you use BBR and/or SO_MAX_PACING_RATE, I would recommend switching to sch_fq