linux-kernel - Re: linux-next: Tree for May 16 (net/core)

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Date:   Tue, 16 May 2017 13:12:44 -0700
From:   Eric Dumazet <edumazet@...gle.com>
To:     Paul Gortmaker <paul.gortmaker@...driver.com>
Cc:     Randy Dunlap <rdunlap@...radead.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Linux-Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: linux-next: Tree for May 16 (net/core)

On Tue, May 16, 2017 at 12:44 PM, Paul Gortmaker
<paul.gortmaker@...driver.com> wrote:
> On Tue, May 16, 2017 at 12:28 PM, Randy Dunlap <rdunlap@...radead.org> wrote:
>> On 05/15/17 18:21, Stephen Rothwell wrote:
>>> Hi all,
>>>
>>> Changes since 20170515:
>>>
>>
>> on i386 or x86_64:
>>
>> when CONFIG_INET is not enabled:
>>
>> ../net/core/sock.c: In function 'skb_orphan_partial':
>> ../net/core/sock.c:1810:2: error: implicit declaration of function 'skb_is_tcp_pure_ack' [-Werror=implicit-function-declaration]
>>   if (skb_is_tcp_pure_ack(skb))
>
> Automated bisect on an ARM build with the same issue reveals:
>
> f6ba8d33cfbb46df569972e64dbb5bb7e929bfd9 is the first bad commit
> commit f6ba8d33cfbb46df569972e64dbb5bb7e929bfd9
> Author: Eric Dumazet <edumazet@...gle.com>
> Date:   Thu May 11 15:24:41 2017 -0700
>
>     netem: fix skb_orphan_partial()
>
>     I should have known that lowering skb->truesize was dangerous :/
>
>     In case packets are not leaving the host via a standard Ethernet device,
>     but looped back to local sockets, bad things can happen, as reported
>     by Michael Madsen ( https://bugzilla.kernel.org/show_bug.cgi?id=195713 )
>
>     So instead of tweaking skb->truesize, lets change skb->destructor
>     and keep a reference on the owner socket via its sk_refcnt.
>
>     Fixes: f2f872f9272a ("netem: Introduce skb_orphan_partial() helper")
>     Signed-off-by: Eric Dumazet <edumazet@...gle.com>
>     Reported-by: Michael Madsen <mkm@...to.com>
>     Signed-off-by: David S. Miller <davem@...emloft.net>
>
> :040000 040000 7bfb7a6f5e12373b1c50ede2455b6ddd6d79cee0
> b45b7255322f1dff5e3ab8d3d707cf38a91c76ce M      net
> bisect run success
>
> http://kisskb.ellerman.id.au/kisskb/buildresult/13033081/
>
> I'm guessing Eric already knows about this but I've Cc'd him just in case.

I was not aware of this, I will submit a fix, thanks.