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Fri, 27 Sep 2019 03:42:06 -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 806B02010BD51 for ; Fri, 27 Sep 2019 03:42:05 -0700 (PDT) Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 9A9D93090FEC; Fri, 27 Sep 2019 10:40:05 +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 580B3194B6; Fri, 27 Sep 2019 10:40:04 +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: Content-Language: en-US X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.43]); Fri, 27 Sep 2019 10:40:05 +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 12:36, Aneesh Kumar K.V wrote: > On 9/27/19 1:16 PM, David Hildenbrand wrote: >> 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. >> > > I posted a patch that can be applied to mainline. I sent that as a reply > to this email. Can you include that and PATCH 2 as first two patches in > your series? That should help to locate the full patch series needed > for fixing the kernel crash. I can drag these along, unless Andrew wants to pick them up right away (or we're waiting for more feedback). Is there a Fixes: Tag we can add to the first patch? -- Thanks, David / dhildenb _______________________________________________ Linux-nvdimm mailing list Linux-nvdimm@lists.01.org https://lists.01.org/mailman/listinfo/linux-nvdimm