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Sun, 15 Aug 2021 18:17:10 +0000 Received: from BY5PR10MB4196.namprd10.prod.outlook.com ([fe80::8d2a:558d:ab4a:9c2a]) by BY5PR10MB4196.namprd10.prod.outlook.com ([fe80::8d2a:558d:ab4a:9c2a%7]) with mapi id 15.20.4415.022; Sun, 15 Aug 2021 18:17:10 +0000 Subject: Re: [syzbot] BUG: unable to handle kernel paging request in alloc_huge_page To: Matthew Wilcox , Andrew Morton Cc: syzbot , linux-kernel@vger.kernel.org, linux-mm@kvack.org, syzkaller-bugs@googlegroups.com References: <000000000000fbad4305c982f836@google.com> <20210814150652.c61e3c09a58222260fa2d02d@linux-foundation.org> From: Mike Kravetz Message-ID: <5810d827-c050-52b6-1b98-8deb99ceda9c@oracle.com> Date: Sun, 15 Aug 2021 11:17:07 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.1.1 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-ClientProxiedBy: MWHPR12CA0038.namprd12.prod.outlook.com (2603:10b6:301:2::24) To BY5PR10MB4196.namprd10.prod.outlook.com (2603:10b6:a03:20d::23) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from [192.168.2.123] (50.38.35.18) by MWHPR12CA0038.namprd12.prod.outlook.com (2603:10b6:301:2::24) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4415.14 via Frontend Transport; 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dkim=pass header.d=oracle.com header.s=corp-2021-07-09 header.b=djAe7oN9; dkim=pass header.d=oracle.com header.s=corp-2020-01-29 header.b=rUamoNJ0; dkim=pass header.d=oracle.onmicrosoft.com header.s=selector2-oracle-onmicrosoft-com header.b=tpscMar7; dmarc=pass (policy=none) header.from=oracle.com; spf=none (imf29.hostedemail.com: domain of mike.kravetz@oracle.com has no SPF policy when checking 205.220.165.32) smtp.mailfrom=mike.kravetz@oracle.com X-HE-Tag: 1629051453-724739 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 8/14/21 4:24 PM, Matthew Wilcox wrote: > On Sat, Aug 14, 2021 at 03:06:52PM -0700, Andrew Morton wrote: >> On Sat, 14 Aug 2021 04:07:23 -0700 syzbot wrote: >>> HEAD commit: 92d00774360d Add linux-next specific files for 20210810 >>> RIP: 0010:__list_add include/linux/list.h:71 [inline] >>> RIP: 0010:list_add include/linux/list.h:86 [inline] >>> RIP: 0010:alloc_huge_page+0xdcb/0x11b0 mm/hugetlb.c:2821 >> >> That appears to be >> >> list_add(&page->lru, &h->hugepage_activelist); >> >> I'm suspecting Mike's surplus page changes? > > Is this not the same as > https://lore.kernel.org/linux-mm/846c4502-3332-0d25-87f5-cb3b71afc38f@quicinc.com/ > which is already patched in your tree? Yes, I believe it is the same, and already fixed. RCX: fffffffffffffffc makes me 99.9% confident. I can verify on Monday. -- Mike Kravetz