From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:45482 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751208AbdLDMbN (ORCPT ); Mon, 4 Dec 2017 07:31:13 -0500 Received: from pps.filterd (m0098413.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.21/8.16.0.21) with SMTP id vB4CTI00105564 for ; Mon, 4 Dec 2017 07:31:13 -0500 Received: from e33.co.us.ibm.com (e33.co.us.ibm.com [32.97.110.151]) by mx0b-001b2d01.pphosted.com with ESMTP id 2en46w72ex-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Mon, 04 Dec 2017 07:31:12 -0500 Received: from localhost by e33.co.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Mon, 4 Dec 2017 05:31:10 -0700 Subject: Re: [PATCH V2 0/2] block: fix queue freeze and cleanup To: Ming Lei Cc: Bart Van Assche , "chenxiang66@hisilicon.com" , "hch@infradead.org" , "linux-block@vger.kernel.org" , "axboe@fb.com" , "osandov@fb.com" , "hare@suse.com" , "wenxiong@us.ibm.com" , "linuxarm@huawei.com" References: <20171123044800.25251-1-ming.lei@redhat.com> <20171127124147.GA16095@ming.t460p> <1512144528.2520.2.camel@sandisk.com> <20171202004953.GB24521@ming.t460p> From: Mauricio Faria de Oliveira Date: Mon, 4 Dec 2017 10:31:01 -0200 MIME-Version: 1.0 In-Reply-To: <20171202004953.GB24521@ming.t460p> Content-Type: text/plain; charset=utf-8; format=flowed Message-Id: <80ff6002-2fa5-a6ce-f6a2-d65df72280b2@linux.vnet.ibm.com> Sender: linux-block-owner@vger.kernel.org List-Id: linux-block@vger.kernel.org On 12/01/2017 10:49 PM, Ming Lei wrote: >> Unfortunately v2 has been found to exhibit another problem, an Oops in >> the systemd shutdown path for device-mapper LVM volumes at least, when >> calling 'q->request_fn(q)' if 'q->request_fn' is NULL. > That issue can be fixed easily in V2 and we understand DM's case clearly. Yes. It just had not been mentioned upstream yet. > But the most important thing is that V2 can't fix Chenxiang's issue, but > V3/V1 can. Agree. -- Mauricio Faria de Oliveira IBM Linux Technology Center