From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
	id S1753161AbcCLBZt (ORCPT <rfc822;w@1wt.eu>);
	Fri, 11 Mar 2016 20:25:49 -0500
Received: from forward.webhostbox.net ([5.100.155.137]:33875 "EHLO
	forward.webhostbox.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
	with ESMTP id S1750980AbcCLBZr (ORCPT
	<rfc822;linux-kernel@vger.kernel.org>);
	Fri, 11 Mar 2016 20:25:47 -0500
Subject: Re: Glibc recvmsg from kernel netlink socket hangs forever
To: Cong Wang <xiyou.wangcong@gmail.com>
References: <CANHDG4bEPkhWG1uhfswoCx=4M1u+QxEJ8TXQNfA=0kkBFjVSEw@mail.gmail.com>
 <20160311235035.GA18302@roeck-us.net>
 <CAM_iQpX5UcLkk8tWiYP9rKke-MZ4T7KkgK4wbZCiJ28g4F+R4g@mail.gmail.com>
Cc: Jun Wang <junwang123@gmail.com>, LKML <linux-kernel@vger.kernel.org>,
        Herbert Xu <herbert@gondor.apana.org.au>
From: Guenter Roeck <linux@roeck-us.net>
Message-ID: <56E37014.7030305@roeck-us.net>
Date: Fri, 11 Mar 2016 17:25:40 -0800
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101
 Thunderbird/38.5.1
MIME-Version: 1.0
In-Reply-To: <CAM_iQpX5UcLkk8tWiYP9rKke-MZ4T7KkgK4wbZCiJ28g4F+R4g@mail.gmail.com>
Content-Type: text/plain; charset=utf-8; format=flowed
Content-Transfer-Encoding: 7bit
X-Authenticated_sender: linux@roeck-us.net
X-OutGoing-Spam-Status: No, score=-1.0
X-CMAE-Score: 0
X-CMAE-Analysis: v=2.1 cv=NfdGrz34 c=1 sm=1 tr=0
	a=QNED+QcLUkoL9qulTODnwA==:117 a=2cfIYNtKkjgZNaOwnGXpGw==:17
	a=L9H7d07YOLsA:10 a=9cW_t1CCXrUA:10 a=s5jvgZ67dGcA:10 a=IkcTkHD0fZMA:10
	a=7OsogOcEt9IA:10 a=aQ7YRQBZ54L1uaaTAScA:9 a=SvJB_cCMw6d2rOlT:21
	a=hFvgIscgp5H4INcQ:21 a=QEXdDO2ut3YA:10
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

On 03/11/2016 04:13 PM, Cong Wang wrote:
> On Fri, Mar 11, 2016 at 3:50 PM, Guenter Roeck <linux@roeck-us.net> wrote:
>> On Fri, Mar 11, 2016 at 11:33:17AM -0800, Jun Wang wrote:
>>> Guenter,
>>>
>>> Which additional netlink changes from 4.2 did you patch? We still see
>>> the problem with your test program with 4.1.12 which have the
>>> following two patches mentioned by Herbert Xu on this thread.
>>>
>> Jun,
>>
>> Sorry, I don't recall, and I no longer have access to the kernel since
>> I now work for a different company. I do recall that we had to apply
>> additional patches later, but I don't remember details.
>
> I think it is probably this one:
>
> https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/commit/net/netlink/af_netlink.c?h=linux-4.1.y&id=a52ec6de6d1638e8c203d7188c55627f75371612
>
> The original backport is incorrect in 4.1 branch, and it is fixed now.
>
Yes, overall I would hope that 4.1.y should be up to date and working now.

Guenter