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Date:	Wed, 23 May 2012 15:30:24 -0300
From:	Sergio Correia <lists@...e.net>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	netdev@...r.kernel.org
Subject: Re: WARNING: at net/ipv4/tcp.c:1301 tcp_cleanup_rbuf+0x4f/0x110()

On Wed, May 23, 2012 at 1:36 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> On Wed, 2012-05-23 at 12:56 -0300, Sergio Correia wrote:
>> On Wed, May 23, 2012 at 12:08 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
>> > On Tue, 2012-05-22 at 11:47 -0300, Sergio Correia wrote:
>> >> Hi Eric,
>> > ...
>> >> Yes, it's an Atheros AR9285 adapter.
>> >> This morning I did a make mrproper before rebuilding the kernel
>> >> (should I always do that?), but the warning has just appeared again.
>> >
>> > OK, I am taking a look at this problem, thanks.
>> >
>>
>> Thanks. Let me know if you need additional info. As of now, my dmesg
>> basically shows only those warnings.
>
> I believe I found the bug and am testing a fix right now.
>
> By the way, we might have the same problem in tcp collapses.
>
> TCP coalescing (introduced in linux-3.5) triggers the problem faster.
>
> Please test following patch :
>

I reverted back to 471368557a734c6c486ee757952c902b36e7fd01 and it
took almost one hour to trigger the warning. Now I have applied your
patch and will report back how it went after a few hours of testing.
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