From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <yuanhan.liu@linux.intel.com>
Received: from mga01.intel.com (mga01.intel.com [192.55.52.88])
 by dpdk.org (Postfix) with ESMTP id 12F022951
 for <dev@dpdk.org>; Thu, 21 Jul 2016 15:31:50 +0200 (CEST)
Received: from orsmga002.jf.intel.com ([10.7.209.21])
 by fmsmga101.fm.intel.com with ESMTP; 21 Jul 2016 06:31:50 -0700
X-ExtLoop1: 1
X-IronPort-AV: E=Sophos;i="5.28,399,1464678000"; d="scan'208";a="1021289939"
Received: from yliu-dev.sh.intel.com (HELO yliu-dev) ([10.239.67.162])
 by orsmga002.jf.intel.com with ESMTP; 21 Jul 2016 06:31:48 -0700
Date: Thu, 21 Jul 2016 21:35:58 +0800
From: Yuanhan Liu <yuanhan.liu@linux.intel.com>
To: Ilya Maximets <i.maximets@samsung.com>
Cc: dev@dpdk.org, Huawei Xie <huawei.xie@intel.com>,
 Dyasly Sergey <s.dyasly@samsung.com>,
 Heetae Ahn <heetae82.ahn@samsung.com>,
 Thomas Monjalon <thomas.monjalon@6wind.com>
Message-ID: <20160721133558.GK28708@yliu-dev.sh.intel.com>
References: <1469089275-15209-1-git-send-email-i.maximets@samsung.com>
 <1469107175-1216-1-git-send-email-i.maximets@samsung.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <1469107175-1216-1-git-send-email-i.maximets@samsung.com>
User-Agent: Mutt/1.5.23 (2014-03-12)
Subject: Re: [dpdk-dev] [PATCH v3] vhost: fix connect hang in client mode
X-BeenThere: dev@dpdk.org
X-Mailman-Version: 2.1.15
Precedence: list
List-Id: patches and discussions about DPDK <dev.dpdk.org>
List-Unsubscribe: <http://dpdk.org/ml/options/dev>,
 <mailto:dev-request@dpdk.org?subject=unsubscribe>
List-Archive: <http://dpdk.org/ml/archives/dev/>
List-Post: <mailto:dev@dpdk.org>
List-Help: <mailto:dev-request@dpdk.org?subject=help>
List-Subscribe: <http://dpdk.org/ml/listinfo/dev>,
 <mailto:dev-request@dpdk.org?subject=subscribe>
X-List-Received-Date: Thu, 21 Jul 2016 13:31:51 -0000

On Thu, Jul 21, 2016 at 04:19:35PM +0300, Ilya Maximets wrote:
> If something abnormal happened to QEMU, 'connect()' can block calling
> thread (e.g. main thread of OVS) forever or for a really long time.
> This can break whole application or block the reconnection thread.
> 
> Example with OVS:
> 
> 	ovs_rcu(urcu2)|WARN|blocked 512000 ms waiting for main to quiesce
> 	(gdb) bt
> 	#0  connect () from /lib64/libpthread.so.0
> 	#1  vhost_user_create_client (vsocket=0xa816e0)
> 	#2  rte_vhost_driver_register
> 	#3  netdev_dpdk_vhost_user_construct
> 	#4  netdev_open (name=0xa664b0 "vhost1")
> 	[...]
> 	#11 main
> 
> Fix that by setting non-blocking mode for client sockets for connection.
> 
> Fixes: 64ab701c3d1e ("vhost: add vhost-user client mode")
> 
> Signed-off-by: Ilya Maximets <i.maximets@samsung.com>

Acked-by: Yuanhan Liu <yuanhan.liu@linux.intel.com>

One help I'd like to ask is that I'd appriciate if you could do the test
to make sure that your 2 (latest) patches fix the two issues you reported.

You might have already done that; I just want to make sure.

Thanks.

	--yliu