From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-lf1-f44.google.com (mail-lf1-f44.google.com [209.85.167.44]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by lists.bufferbloat.net (Postfix) with ESMTPS id B77083B29E for ; Thu, 31 Jan 2019 18:31:30 -0500 (EST) Received: by mail-lf1-f44.google.com with SMTP id b20so3648080lfa.12 for ; Thu, 31 Jan 2019 15:31:30 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=V6iEY1ajrcObOgNY9nrt3rXl1yU+UoKTgqTjekUzpdY=; b=Cq22XRA5kCKGj5Mc5F4bCN7nnFk/YS5t1iC+DxGGQwUlFSbqEq7ifcRCVzZOie7Myr yDtN4ruXb0BcN8oIPOlev82GCDdKJe0EETga5vFuV3lj3ux09hQGyBF7CNUjGRzbZ7SL nnsv/+vxCEiUR4VYylM1elUz0+uexB4Rx9ulE0TbBny7/j9Y25hVqlqBnYw2GaMKqKK9 NCKG7rO8QMhWH9F1HgwjzBBS1f+xrAz4miSv1iWKtunGIOREi0cpUdm6ePixr3K/zlNN zXEgM1fUcSZGuyHCceSFL/HdE9XETrJrTRzFKw/O6cCE2YNpnY+Jq5575ZUCukH0XHRx Q7DA== X-Gm-Message-State: AJcUukdX7eHJ5LDdNnJHI3URWQUI7F2nzEHlB6i1SrYR7h73zsiTKmG7 7K8HdfgNC2NvxICQVagv0oybOuA4Aagy/bdHsqkUog== X-Google-Smtp-Source: ALg8bN6k+QaRGXPE5wPcZwB365Y1qa+q6X2qjWcMxe91QfxWF+k9AADlqZzNUux/IRvr63wyLCJvgFJ8XzM2aqPVpfU= X-Received: by 2002:a19:db54:: with SMTP id s81mr30287622lfg.102.1548977489474; Thu, 31 Jan 2019 15:31:29 -0800 (PST) MIME-Version: 1.0 References: <15FB76CC-44B2-496B-80EC-8D00AD2AF9B7@heistp.net> <87zhrhiwfv.fsf@toke.dk> <9540B582-7B7C-4846-BA40-54419DF109D4@heistp.net> <87r2csj2uk.fsf@toke.dk> <60A1337C-DE0E-43DE-B5CA-5815F615124D@heistp.net> <87ef8sifh0.fsf@toke.dk> <7052193E-AB03-4FF7-9155-4CE62A43D22F@heistp.net> In-Reply-To: <7052193E-AB03-4FF7-9155-4CE62A43D22F@heistp.net> From: =?UTF-8?B?VG9rZSBIw7hpbGFuZC1Kw7hyZ2Vuc2Vu?= Date: Fri, 1 Feb 2019 00:31:17 +0100 Message-ID: To: Pete Heist Cc: Cake List Content-Type: multipart/alternative; boundary="0000000000000692f90580c96d41" Subject: Re: [Cake] lockup with multiple cake instances on 3.16.7 X-BeenThere: cake@lists.bufferbloat.net X-Mailman-Version: 2.1.20 Precedence: list List-Id: Cake - FQ_codel the next generation List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 31 Jan 2019 23:31:31 -0000 --0000000000000692f90580c96d41 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, 1 Feb 2019, 00:23 Pete Heist > > On Feb 1, 2019, at 12:18 AM, Toke H=C3=B8iland-J=C3=B8rgensen > wrote: > > > > (crossed streams; but yeah, basically the same conclusion) > > Ok, crossed-crossed streams references it is=E2=80=A6 :) > > >> Do you think this is a correct patch? > > > > Well, the "correct patch" would be to get upstream fixed :) > > > > But yeah, I don't think it would hurt to carry this as a workaround > > patch until that happens... > > > > I guess you could try running it for a while and see if anything else > > blows up? You seem to have quite a knack for getting it to fail... ;) > > That sounds reasonable, let me see if I can break it in some different > cases. > Cool. My guess is, past qdiscs didn=E2=80=99t manage to fill the tailroom space a= nd cause > this problem, but I=E2=80=99m not sure=E2=80=A6 > Wouldn't be the first bug we've exposed in this code: https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git/commit/?= id=3Dd5a672ac9f48f81b20b1cad1d9ed7bbf4e418d4c -Toke > --0000000000000692f90580c96d41 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable


= On Fri, 1 Feb 2019, 00:23 Pete Heist <pete@heistp.net wrote:

> On Feb 1, 2019, at 12:18 AM, Toke H=C3=B8iland-J=C3=B8rgensen <toke@re= dhat.com> wrote:
>
> (crossed streams; but yeah, basically the same conclusion)

Ok, crossed-crossed streams references it is=E2=80=A6 :)

>> Do you think this is a correct patch?
>
> Well, the "correct patch" would be to get upstream fixed :)<= br> >
> But yeah, I don't think it would hurt to carry this as a workaroun= d
> patch until that happens...
>
> I guess you could try running it for a while and see if anything else<= br> > blows up? You seem to have quite a knack for getting it to fail... ;)<= br>
That sounds reasonable, let me see if I can break it in some different case= s.

Cool.

My guess is, past qdiscs didn=E2=80=99t manage to fill the tailroom space a= nd cause this problem, but I=E2=80=99m not sure=E2=80=A6


-Toke
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