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[141.146.126.79]) by mx.google.com with ESMTPS id v3si303780qkc.114.2019.03.27.03.26.11 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 27 Mar 2019 03:26:11 -0700 (PDT) Received-SPF: pass (google.com: domain of william.kucharski@oracle.com designates 141.146.126.79 as permitted sender) client-ip=141.146.126.79; Authentication-Results: mx.google.com; dkim=pass header.i=@oracle.com header.s=corp-2018-07-02 header.b=UhwgKwT+; spf=pass (google.com: domain of william.kucharski@oracle.com designates 141.146.126.79 as permitted sender) smtp.mailfrom=william.kucharski@oracle.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=oracle.com Received: from pps.filterd (aserp2130.oracle.com [127.0.0.1]) by aserp2130.oracle.com (8.16.0.27/8.16.0.27) with SMTP id x2RADnu4043952; Wed, 27 Mar 2019 10:26:10 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=content-type : mime-version : subject : from : in-reply-to : date : cc : content-transfer-encoding : message-id : references : to; s=corp-2018-07-02; bh=VcAQbbXDBqTw84B+zk/fFVeuAnEQor5PVMnQNwxDWss=; b=UhwgKwT+elL7PbO6otWVV9GJzz3Q9ltcXMUC6Cf3ioGRjVBFGcnvLXlcuhUCjuFZB+MQ YB2TcIERHKXLaC1JgFHC2k8MWxW6nZueL4/RzPPt9Eoih4yVmxbhCr2GCmgtSIPfLjEA lTunQBwIqbEd0+z9bPet0xzW5V6aj4Nx0NFZXLk7lxTfgEFIyQc2TvGUmWu8Zrpl44Jh fRrtntiTv2YCgBPKT/LdV+QReAclg9X/2Y4wjVd0Fn7kTTXKFkhLFdPjn/wLPogrv8Zj mosjket86+TbqZGY2rZxdMmSHpjWucadXUJdJE71QhXk11rwjjfm7D/lVhLTeRrPEE98 ew== Received: from aserv0021.oracle.com (aserv0021.oracle.com [141.146.126.233]) by aserp2130.oracle.com with ESMTP id 2re6g0ymwe-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 27 Mar 2019 10:26:09 +0000 Received: from aserv0122.oracle.com (aserv0122.oracle.com [141.146.126.236]) by aserv0021.oracle.com (8.14.4/8.14.4) with ESMTP id x2RAQ9BS009230 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 27 Mar 2019 10:26:09 GMT Received: from abhmp0013.oracle.com (abhmp0013.oracle.com [141.146.116.19]) by aserv0122.oracle.com (8.14.4/8.14.4) with ESMTP id x2RAQ8EE005484; Wed, 27 Mar 2019 10:26:08 GMT Received: from [192.168.0.110] (/73.243.10.6) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Wed, 27 Mar 2019 03:26:08 -0700 Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Mac OS X Mail 12.4 \(3445.104.8\)) Subject: Re: CONFIG_DEBUG_VIRTUAL breaks boot on x86-32 From: William Kucharski In-Reply-To: Date: Wed, 27 Mar 2019 04:26:07 -0600 Cc: Ralph Campbell , LKML , linux-mm@kvack.org Content-Transfer-Encoding: quoted-printable Message-Id: <4AF9E4BD-58F0-4D12-A495-6192978790B6@oracle.com> References: <4d5ee3b0-6d47-a8df-a6b3-54b0fba66ed7@linux.ee> To: Meelis Roos X-Mailer: Apple Mail (2.3445.104.8) X-Proofpoint-Virus-Version: vendor=nai engine=5900 definitions=9207 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1903270074 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000123, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: The dmesg output you posted confirms that max_low_pfn is indeed 0x373fe, = and it appears that the value of phys_mem being checked mat be 0x3f401ff1, which = translates to pfn 0x3f401, at least if what's still in registers can be believed. Since that is indeed greater than max_low_pfn, VIRTUAL_BUG_ON triggers: VIRTUAL_BUG_ON((phys_addr >> PAGE_SHIFT) > max_low_pfn); Looking at the call stack of copy_strings_0x220 __check_object_size+0xef that looks to translate to this sequence: copy_from_user(kaddr+offset, str, bytes_to_copy) check_copy_size(kaddr+offset, bytes_to_copy, FALSE) check_object_size(kaddr+offset, bytes_to_copy, FALSE) __check_object_size(kaddr+offset, bytes_to_copy, FALSE) check_heap_object(kaddr+offset, bytes_to_copy, FALSE) virt_to_head_page(kaddr+offset) virt_to_page(kaddr+offset) pfn_to_page(kaddr+offset) __pa(kaddr+offset) __phys_addr(kaddr+offset) so it appears the address is "too high" for low memory at that point. =20