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Date: Thu, 2 Feb 2017 15:03:54 +0100
From: Dmitry Vyukov <dvyukov@...gle.com>
To: Eric Dumazet <eric.dumazet@...il.com>
Cc: Eric Dumazet <edumazet@...gle.com>,
Andrey Konovalov <andreyknvl@...gle.com>,
"David S. Miller" <davem@...emloft.net>,
Alexey Kuznetsov <kuznet@....inr.ac.ru>,
James Morris <jmorris@...ei.org>,
Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
Patrick McHardy <kaber@...sh.net>,
netdev <netdev@...r.kernel.org>,
LKML <linux-kernel@...r.kernel.org>,
Kostya Serebryany <kcc@...gle.com>,
syzkaller <syzkaller@...glegroups.com>
Subject: Re: net/tcp: warning in tcp_try_coalesce/skb_try_coalesce
On Thu, Feb 2, 2017 at 2:56 PM, Dmitry Vyukov <dvyukov@...gle.com> wrote:
> On Thu, Feb 2, 2017 at 2:40 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
>> On Thu, 2017-02-02 at 13:59 +0100, Dmitry Vyukov wrote:
>>
>>>
>>> Right, I can confirm that this is not happening on net-next tip
>>> (62e13097c46c69dbd7544ab2cd585ccf48f360a4).
>>> I reproduced it on a random month old commit on net-next, though
>>> (23a8ed4a624324dc696c328f09bd502c4a3816f0). Let's consider that this
>>> is accidentally fixed by something in that range.
>>
>> This also might depend on the .config
>>
>> I tried 23a8ed4a624324dc696c328f09bd502c4a3816f0 and could not trigger
>> the warning .
>
>
> I've attached my config.
> But I've tried with the same config on both revisions.
>
> Well, there is also a chance that the bug is not fixed, but requires
> slightly different reproducer after some changes.
Hummm....
My config includes KASAN+KCOV and I use gcc version 7.0.0 20161208
(experimental) (GCC).
I've now tried to turn off KASAN+KCOV and compiled with my stock
4.8.4, and this did _not_ trigger the warning on
23a8ed4a624324dc696c328f09bd502c4a3816f0.
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