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 S1751472AbdEBIA6 (ORCPT <rfc822;w@1wt.eu>);
        Tue, 2 May 2017 04:00:58 -0400
Received: from szxga02-in.huawei.com ([45.249.212.188]:5843 "EHLO
        szxga02-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
        with ESMTP id S1751012AbdEBIA5 (ORCPT
        <rfc822;linux-kernel@vger.kernel.org>);
        Tue, 2 May 2017 04:00:57 -0400
Message-ID: <59083C5B.5080204@huawei.com>
Date: Tue, 2 May 2017 15:59:23 +0800
From: Xishi Qiu <qiuxishi@huawei.com>
User-Agent: Mozilla/5.0 (Windows NT 6.1; rv:12.0) Gecko/20120428 Thunderbird/12.0.1
MIME-Version: 1.0
To: Andrew Morton <akpm@linux-foundation.org>,
        Mel Gorman <mgorman@suse.de>, Vlastimil Babka <vbabka@suse.cz>,
        Joonsoo Kim <js1304@gmail.com>, "Michal Hocko" <mhocko@kernel.org>,
        Johannes Weiner <hannes@cmpxchg.org>, Rik van Riel <riel@redhat.com>,
        Shakeel Butt <shakeelb@google.com>
CC: Linux MM <linux-mm@kvack.org>, LKML <linux-kernel@vger.kernel.org>,
        "zhong jiang" <zhongjiang@huawei.com>
Subject: [RFC] dev/mem: "memtester -p 0x6c80000000000 10G" cause crash
Content-Type: text/plain; charset="ISO-8859-1"
Content-Transfer-Encoding: 7bit
X-Originating-IP: [10.177.25.179]
X-CFilter-Loop: Reflected
X-Mirapoint-Virus-RAPID-Raw: score=unknown(0),
        refid=str=0001.0A020205.59083CAA.00D0,ss=1,re=0.000,recu=0.000,reip=0.000,cl=1,cld=1,fgs=0,
        ip=0.0.0.0,
        so=2014-11-16 11:51:01,
        dmn=2013-03-21 17:37:32
X-Mirapoint-Loop-Id: 8447b667a41ff6efc0f51c767c9c0649
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

Hi, I use "memtester -p 0x6c80000000000 10G" to test physical address 0x6c80000000000
Because this physical address is invalid, and valid_mmap_phys_addr_range()
always return 1, so it causes crash.

My question is that should the user assure the physical address is valid?

...
[ 169.147578] ? panic+0x1f1/0x239
[ 169.150789] oops_end+0xb8/0xd0
[ 169.153910] pgtable_bad+0x8a/0x95
[ 169.157294] __do_page_fault+0x3aa/0x4a0
[ 169.161194] do_page_fault+0x30/0x80
[ 169.164750] ? do_syscall_64+0x175/0x180
[ 169.168649] page_fault+0x28/0x30

Thanks,
Xishi Qiu