Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
        id S1753935AbcLILxp (ORCPT <rfc822;w@1wt.eu>);
        Fri, 9 Dec 2016 06:53:45 -0500
Received: from mail-wm0-f50.google.com ([74.125.82.50]:35487 "EHLO
        mail-wm0-f50.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
        with ESMTP id S1752644AbcLILxn (ORCPT
        <rfc822;linux-kernel@vger.kernel.org>);
        Fri, 9 Dec 2016 06:53:43 -0500
MIME-Version: 1.0
In-Reply-To: <20161209114847.GX22655@madcap2.tricolour.ca>
References: <20161129164859.GD26673@madcap2.tricolour.ca> <CAM_iQpX_KBEpL1dCBNMgZQ-VQJM9nmsVdRPVK-Aen9k0gV3f0w@mail.gmail.com>
 <20161130045207.GE26673@madcap2.tricolour.ca> <20161209060248.GT22655@madcap2.tricolour.ca>
 <CACT4Y+beWN9jmdTREk3JdEBQ3GRALGDJhy7pYF=wu3HdnNWEog@mail.gmail.com> <20161209114847.GX22655@madcap2.tricolour.ca>
From: Dmitry Vyukov <dvyukov@google.com>
Date: Fri, 9 Dec 2016 12:53:21 +0100
Message-ID: <CACT4Y+ZsOXoQqVE4vhenb9fUJkwAbGL6wUZxGyaT2h7Cncbfog@mail.gmail.com>
Subject: Re: netlink: GPF in sock_sndtimeo
To: Richard Guy Briggs <rgb@redhat.com>
Cc: netdev <netdev@vger.kernel.org>, LKML <linux-kernel@vger.kernel.org>
Content-Type: text/plain; charset=UTF-8
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org
Content-Transfer-Encoding: 8bit
X-MIME-Autoconverted: from quoted-printable to 8bit by mail.home.local id uB9BrnHs028254
Content-Length: 2006
Lines: 50

On Fri, Dec 9, 2016 at 12:48 PM, Richard Guy Briggs <rgb@redhat.com> wrote:
> On 2016-12-09 11:49, Dmitry Vyukov wrote:
>> On Fri, Dec 9, 2016 at 7:02 AM, Richard Guy Briggs <rgb@redhat.com> wrote:
>> > On 2016-11-29 23:52, Richard Guy Briggs wrote:
>> > I tried a quick compile attempt on the test case (I assume it is a
>> > socket fuzzer) and get the following compile error:
>> > cc -g -O0 -Wall -D_GNU_SOURCE -o socket_fuzz socket_fuzz.c
>> > socket_fuzz.c:16:1: warning: "_GNU_SOURCE" redefined
>> > <command-line>: warning: this is the location of the previous definition
>> > socket_fuzz.c: In function ‘segv_handler’:
>> > socket_fuzz.c:89: warning: implicit declaration of function ‘__atomic_load_n’
>> > socket_fuzz.c:89: error: ‘__ATOMIC_RELAXED’ undeclared (first use in this function)
>> > socket_fuzz.c:89: error: (Each undeclared identifier is reported only once
>> > socket_fuzz.c:89: error: for each function it appears in.)
>> > socket_fuzz.c: In function ‘loop’:
>> > socket_fuzz.c:280: warning: unused variable ‘errno0’
>> > socket_fuzz.c: In function ‘test’:
>> > socket_fuzz.c:303: warning: implicit declaration of function ‘__atomic_fetch_add’
>> > socket_fuzz.c:303: error: ‘__ATOMIC_SEQ_CST’ undeclared (first use in this function)
>> > socket_fuzz.c:303: warning: implicit declaration of function ‘__atomic_fetch_sub’
>>
>> -std=gnu99 should help
>> ignore warnings
>
> I got a little further, left with "__ATOMIC_RELAXED undeclared", "__ATOMIC_SEQ_CST
> undeclared" under gcc 4.4.7-16.
>
> gcc 4.8.2-15 leaves me with "undefined reference to `clock_gettime'"

add -lrt


> What compiler version do you recommend?

6.x sounds reasonable
4.4 branch is 7.5 years old, surprised that it does not disintegrate
into dust yet :)


>> >> - RGB
>> >
>> > - RGB
>
> - RGB
>
> --
> Richard Guy Briggs <rgb@redhat.com>
> Kernel Security Engineering, Base Operating Systems, Red Hat
> Remote, Ottawa, Canada
> Voice: +1.647.777.2635, Internal: (81) 32635