From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9A7EFC4360C for ; Fri, 27 Sep 2019 07:46:47 +0000 (UTC) Received: from ml01.01.org (ml01.01.org [198.145.21.10]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 6B9F22075D for ; Fri, 27 Sep 2019 07:46:47 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 6B9F22075D Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-nvdimm-bounces@lists.01.org Received: from [127.0.0.1] (localhost [IPv6:::1]) by ml01.01.org (Postfix) with ESMTP id 8DC052010BD53; Fri, 27 Sep 2019 00:48:47 -0700 (PDT) Received-SPF: Pass (sender SPF authorized) identity=mailfrom; client-ip=209.132.183.28; helo=mx1.redhat.com; envelope-from=david@redhat.com; receiver=linux-nvdimm@lists.01.org Received: from mx1.redhat.com (mx1.redhat.com [209.132.183.28]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ml01.01.org (Postfix) with ESMTPS id 1C4AD2010BD06 for ; Fri, 27 Sep 2019 00:48:45 -0700 (PDT) Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 3732513A82; Fri, 27 Sep 2019 07:46:44 +0000 (UTC) Received: from [10.36.116.169] (ovpn-116-169.ams2.redhat.com [10.36.116.169]) by smtp.corp.redhat.com (Postfix) with ESMTP id 04D08600C6; Fri, 27 Sep 2019 07:46:42 +0000 (UTC) Subject: Re: [PATCH 1/2] mm/memunmap: Use the correct start and end pfn when removing pages from zone To: "Aneesh Kumar K.V" , Andrew Morton References: <20190830091428.18399-1-david@redhat.com> <20190926122552.17905-1-aneesh.kumar@linux.ibm.com> <20190926154508.3dba3dc398b7bb9a40ba15da@linux-foundation.org> <894daaaf-ce64-c2d8-d246-5d4c5f42579d@linux.ibm.com> From: David Hildenbrand Openpgp: preference=signencrypt Autocrypt: addr=david@redhat.com; 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Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: <894daaaf-ce64-c2d8-d246-5d4c5f42579d@linux.ibm.com> Content-Language: en-US X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.29]); Fri, 27 Sep 2019 07:46:44 +0000 (UTC) X-BeenThere: linux-nvdimm@lists.01.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Linux-nvdimm developer list." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-mm@kvack.org, linux-nvdimm@lists.01.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: linux-nvdimm-bounces@lists.01.org Sender: "Linux-nvdimm" On 27.09.19 03:51, Aneesh Kumar K.V wrote: > On 9/27/19 4:15 AM, Andrew Morton wrote: >> On Thu, 26 Sep 2019 17:55:51 +0530 "Aneesh Kumar K.V" wrote: >> >>> With altmap, all the resource pfns are not initialized. While initializing >>> pfn, altmap reserve space is skipped. Hence when removing pfn from zone skip >>> pfns that were never initialized. >>> >>> Update memunmap_pages to calculate start and end pfn based on altmap >>> values. This fixes a kernel crash that is observed when destroying namespace. >>> >>> [ 74.745056] BUG: Unable to handle kernel data access at 0xc00c000001400000 >>> [ 74.745256] Faulting instruction address: 0xc0000000000b58b0 >>> cpu 0x2: Vector: 300 (Data Access) at [c00000026ea93580] >>> pc: c0000000000b58b0: memset+0x68/0x104 >>> lr: c0000000003eb008: page_init_poison+0x38/0x50 >>> ... >>> current = 0xc000000271c67d80 >>> paca = 0xc00000003fffd680 irqmask: 0x03 irq_happened: 0x01 >>> pid = 3665, comm = ndctl >>> [link register ] c0000000003eb008 page_init_poison+0x38/0x50 >>> [c00000026ea93830] c0000000004754d4 remove_pfn_range_from_zone+0x64/0x3e0 >>> [c00000026ea938a0] c0000000004b8a60 memunmap_pages+0x300/0x400 >>> [c00000026ea93930] c0000000009e32a0 devm_action_release+0x30/0x50 >> >> Doesn't apply to mainline or -next. Which tree is this against? >> > > After applying the patches from David on mainline. That is the reason I > replied to this thread. I should have mentioned in the email that it is > based on patch series "[PATCH v4 0/8] mm/memory_hotplug: Shrink zones > before removing memory" So if I am not wrong, my patch "[PATCH v4 4/8] mm/memory_hotplug: Poison memmap in remove_pfn_range_from_zone()" makes it show up that we actually call _remove_pages() with wrong parameters, right? If so, I guess it would be better for you to fix it before my series and I will rebase my series on top of that. -- Thanks, David / dhildenb _______________________________________________ Linux-nvdimm mailing list Linux-nvdimm@lists.01.org https://lists.01.org/mailman/listinfo/linux-nvdimm