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=-0.9 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,UNPARSEABLE_RELAY 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 D40AEC433DF for ; Mon, 1 Jun 2020 21:59:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9DC2F206F1 for ; Mon, 1 Jun 2020 21:59:46 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b="BRUlSwmw" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729075AbgFAV7p (ORCPT ); Mon, 1 Jun 2020 17:59:45 -0400 Received: from userp2130.oracle.com ([156.151.31.86]:60984 "EHLO userp2130.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728336AbgFAV7p (ORCPT ); Mon, 1 Jun 2020 17:59:45 -0400 Received: from pps.filterd (userp2130.oracle.com [127.0.0.1]) by userp2130.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 051LvqL6109636; Mon, 1 Jun 2020 21:59:09 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-2020-01-29; bh=h7KFzIKQk9wBseW2QkNgl1tpKnkB5r7VZ+cTH50tGkU=; b=BRUlSwmwI4afd6ZLHDR+g9bDk1X1Zlzgc2JS8+cfUaj9d7+FEz9rl1YqQc2H7IV1c99p Yr9v2z8SVPT3aDR9bHSSpzyLOuXmxAlY1D1wFEecBPOX+VfkPPIB8DHVSjI3sxpv4tuR usvQSlxiuJlMsNIy0suerjjiQPOZxbEMj33gyiAuXgJg7MWlqqh5AirvrjGieq68Todl Tcg88Xxs6U4WHgyuX42H/UEIpC+XmcGMMABf983N4GhqYv1Y1L07WjjEzd4XOcPnIhJS /VQjyivdUu337DiSHR2JWPHaPzdJh0pEmMsVF9SPIk+obS3TVFp69uoSUaxxctObOimv PQ== Received: from aserp3020.oracle.com (aserp3020.oracle.com [141.146.126.70]) by userp2130.oracle.com with ESMTP id 31bewqs1xn-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Mon, 01 Jun 2020 21:59:09 +0000 Received: from pps.filterd (aserp3020.oracle.com [127.0.0.1]) by aserp3020.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 051LvsLe086842; Mon, 1 Jun 2020 21:59:08 GMT Received: from userv0122.oracle.com (userv0122.oracle.com [156.151.31.75]) by aserp3020.oracle.com with ESMTP id 31c25kve0d-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 01 Jun 2020 21:59:08 +0000 Received: from abhmp0014.oracle.com (abhmp0014.oracle.com [141.146.116.20]) by userv0122.oracle.com (8.14.4/8.14.4) with ESMTP id 051Lx4Kw026997; Mon, 1 Jun 2020 21:59:04 GMT Received: from dhcp-10-154-163-168.vpn.oracle.com (/10.154.163.168) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Mon, 01 Jun 2020 14:59:04 -0700 Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 11.5 \(3445.9.1\)) Subject: Re: [PATCH v8 0/5] support reserving crashkernel above 4G on arm64 kdump From: John Donnelly In-Reply-To: Date: Mon, 1 Jun 2020 16:59:01 -0500 Cc: Prabhakar Kushwaha , Chen Zhou , Simon Horman , Devicetree List , Baoquan He , Will Deacon , Linux Doc Mailing List , Catalin Marinas , kexec mailing list , Linux Kernel Mailing List , Rob Herring , Ingo Molnar , Arnd Bergmann , guohanjun@huawei.com, James Morse , Thomas Gleixner , Prabhakar Kushwaha , RuiRui Yang , linux-arm-kernel Content-Transfer-Encoding: quoted-printable Message-Id: References: <20200521093805.64398-1-chenzhou10@huawei.com> <303695cc-d3ea-9f51-1489-07d27d4253d4@oracle.com> To: Bhupesh Sharma X-Mailer: Apple Mail (2.3445.9.1) X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9639 signatures=668686 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 adultscore=0 suspectscore=1 spamscore=0 malwarescore=0 bulkscore=0 mlxscore=0 phishscore=0 mlxlogscore=999 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2004280000 definitions=main-2006010158 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9639 signatures=668686 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 priorityscore=1501 bulkscore=0 phishscore=0 suspectscore=1 impostorscore=0 cotscore=-2147483648 lowpriorityscore=0 mlxscore=0 adultscore=0 spamscore=0 mlxlogscore=999 malwarescore=0 clxscore=1015 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2004280000 definitions=main-2006010158 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi . See below !=20 > On Jun 1, 2020, at 4:02 PM, Bhupesh Sharma = wrote: >=20 > Hi John, >=20 > On Tue, Jun 2, 2020 at 1:01 AM John Donnelly = wrote: >>=20 >> Hi, >>=20 >>=20 >> On 6/1/20 7:02 AM, Prabhakar Kushwaha wrote: >>> Hi Chen, >>>=20 >>> On Thu, May 21, 2020 at 3:05 PM Chen Zhou = wrote: >>>> This patch series enable reserving crashkernel above 4G in arm64. >>>>=20 >>>> There are following issues in arm64 kdump: >>>> 1. We use crashkernel=3DX to reserve crashkernel below 4G, which = will fail >>>> when there is no enough low memory. >>>> 2. Currently, crashkernel=3DY@X can be used to reserve crashkernel = above 4G, >>>> in this case, if swiotlb or DMA buffers are required, crash dump = kernel >>>> will boot failure because there is no low memory available for = allocation. >>>>=20 >>>> To solve these issues, introduce crashkernel=3DX,low to reserve = specified >>>> size low memory. >>>> Crashkernel=3DX tries to reserve memory for the crash dump kernel = under >>>> 4G. If crashkernel=3DY,low is specified simultaneously, reserve = spcified >>>> size low memory for crash kdump kernel devices firstly and then = reserve >>>> memory above 4G. >>>>=20 >>>> When crashkernel is reserved above 4G in memory, that is, = crashkernel=3DX,low >>>> is specified simultaneously, kernel should reserve specified size = low memory >>>> for crash dump kernel devices. So there may be two crash kernel = regions, one >>>> is below 4G, the other is above 4G. >>>> In order to distinct from the high region and make no effect to the = use of >>>> kexec-tools, rename the low region as "Crash kernel (low)", and add = DT property >>>> "linux,low-memory-range" to crash dump kernel's dtb to pass the low = region. >>>>=20 >>>> Besides, we need to modify kexec-tools: >>>> arm64: kdump: add another DT property to crash dump kernel's = dtb(see [1]) >>>>=20 >>>> The previous changes and discussions can be retrieved from: >>>>=20 >>>> Changes since [v7] >>>> - Move x86 CRASH_ALIGN to 2M >>>> Suggested by Dave and do some test, move x86 CRASH_ALIGN to 2M. >>>> - Update Documentation/devicetree/bindings/chosen.txt >>>> Add corresponding documentation to = Documentation/devicetree/bindings/chosen.txt suggested by Arnd. >>>> - Add Tested-by from Jhon and pk >>>>=20 >>>> Changes since [v6] >>>> - Fix build errors reported by kbuild test robot. >>>>=20 >>>> Changes since [v5] >>>> - Move reserve_crashkernel_low() into kernel/crash_core.c. >>>> - Delete crashkernel=3DX,high. >>>> - Modify crashkernel=3DX,low. >>>> If crashkernel=3DX,low is specified simultaneously, reserve = spcified size low >>>> memory for crash kdump kernel devices firstly and then reserve = memory above 4G. >>>> In addition, rename crashk_low_res as "Crash kernel (low)" for = arm64, and then >>>> pass to crash dump kernel by DT property "linux,low-memory-range". >>>> - Update Documentation/admin-guide/kdump/kdump.rst. >>>>=20 >>>> Changes since [v4] >>>> - Reimplement memblock_cap_memory_ranges for multiple ranges by = Mike. >>>>=20 >>>> Changes since [v3] >>>> - Add memblock_cap_memory_ranges back for multiple ranges. >>>> - Fix some compiling warnings. >>>>=20 >>>> Changes since [v2] >>>> - Split patch "arm64: kdump: support reserving crashkernel above = 4G" as >>>> two. Put "move reserve_crashkernel_low() into kexec_core.c" in a = separate >>>> patch. >>>>=20 >>>> Changes since [v1]: >>>> - Move common reserve_crashkernel_low() code into = kernel/kexec_core.c. >>>> - Remove memblock_cap_memory_ranges() i added in v1 and implement = that >>>> in fdt_enforce_memory_region(). >>>> There are at most two crash kernel regions, for two crash kernel = regions >>>> case, we cap the memory range [min(regs[*].start), = max(regs[*].end)] >>>> and then remove the memory range in the middle. >>>>=20 >>>> [1]: = https://urldefense.com/v3/__http://lists.infradead.org/pipermail/kexec/202= 0-May/025128.html__;!!GqivPVa7Brio!LnTSARkCt0V0FozR0KmqooaH5ADtdXvs3mPdP3K= RVqALmvSK2VmCkIPIhsaxbvpn1uM1$ >>>> [v1]: = https://urldefense.com/v3/__https://lkml.org/lkml/2019/4/2/1174__;!!GqivPV= a7Brio!LnTSARkCt0V0FozR0KmqooaH5ADtdXvs3mPdP3KRVqALmvSK2VmCkIPIhsaxbt0xN9P= E$ >>>> [v2]: = https://urldefense.com/v3/__https://lkml.org/lkml/2019/4/9/86__;!!GqivPVa7= Brio!LnTSARkCt0V0FozR0KmqooaH5ADtdXvs3mPdP3KRVqALmvSK2VmCkIPIhsaxbub7yUQH$= >>>> [v3]: = https://urldefense.com/v3/__https://lkml.org/lkml/2019/4/9/306__;!!GqivPVa= 7Brio!LnTSARkCt0V0FozR0KmqooaH5ADtdXvs3mPdP3KRVqALmvSK2VmCkIPIhsaxbnc4zPPV= $ >>>> [v4]: = https://urldefense.com/v3/__https://lkml.org/lkml/2019/4/15/273__;!!GqivPV= a7Brio!LnTSARkCt0V0FozR0KmqooaH5ADtdXvs3mPdP3KRVqALmvSK2VmCkIPIhsaxbvsAsZL= u$ >>>> [v5]: = https://urldefense.com/v3/__https://lkml.org/lkml/2019/5/6/1360__;!!GqivPV= a7Brio!LnTSARkCt0V0FozR0KmqooaH5ADtdXvs3mPdP3KRVqALmvSK2VmCkIPIhsaxbl24n-7= 9$ >>>> [v6]: = https://urldefense.com/v3/__https://lkml.org/lkml/2019/8/30/142__;!!GqivPV= a7Brio!LnTSARkCt0V0FozR0KmqooaH5ADtdXvs3mPdP3KRVqALmvSK2VmCkIPIhsaxbs7r8G2= a$ >>>> [v7]: = https://urldefense.com/v3/__https://lkml.org/lkml/2019/12/23/411__;!!GqivP= Va7Brio!LnTSARkCt0V0FozR0KmqooaH5ADtdXvs3mPdP3KRVqALmvSK2VmCkIPIhsaxbiFUH9= 0G$ >>>>=20 >>>> Chen Zhou (5): >>>> x86: kdump: move reserve_crashkernel_low() into crash_core.c >>>> arm64: kdump: reserve crashkenel above 4G for crash dump kernel >>>> arm64: kdump: add memory for devices by DT property, = low-memory-range >>>> kdump: update Documentation about crashkernel on arm64 >>>> dt-bindings: chosen: Document linux,low-memory-range for arm64 = kdump >>>>=20 >>> We are getting "warn_alloc" [1] warning during boot of kdump kernel >>> with bootargs as [2] of primary kernel. >>> This error observed on ThunderX2 ARM64 platform. >>>=20 >>> It is observed with latest upstream tag (v5.7-rc3) with this patch = set >>> and = https://urldefense.com/v3/__https://lists.infradead.org/pipermail/kexec/20= 20-May/025128.html__;!!GqivPVa7Brio!LnTSARkCt0V0FozR0KmqooaH5ADtdXvs3mPdP3= KRVqALmvSK2VmCkIPIhsaxbiIAAlzu$ >>> Also **without** this patch-set >>> = "https://urldefense.com/v3/__https://www.spinics.net/lists/arm-kernel/msg8= 06882.html__;!!GqivPVa7Brio!LnTSARkCt0V0FozR0KmqooaH5ADtdXvs3mPdP3KRVqALmv= SK2VmCkIPIhsaxbjC6ujMA$" >>>=20 >>> This issue comes whenever crashkernel memory is reserved after = 0xc000_0000. >>> More details discussed earlier in >>> = https://urldefense.com/v3/__https://www.spinics.net/lists/arm-kernel/msg80= 6882.html__;!!GqivPVa7Brio!LnTSARkCt0V0FozR0KmqooaH5ADtdXvs3mPdP3KRVqALmvS= K2VmCkIPIhsaxbjC6ujMA$ without any >>> solution >>>=20 >>> This patch-set is expected to solve similar kind of issue. >>> i.e. low memory is only targeted for DMA, swiotlb; So above = mentioned >>> observation should be considered/fixed. . >>>=20 >>> --pk >>>=20 >>> [1] >>> [ 30.366695] DMI: Cavium Inc. Saber/Saber, BIOS >>> TX2-FW-Release-3.1-build_01-2803-g74253a541a mm/dd/yyyy >>> [ 30.367696] NET: Registered protocol family 16 >>> [ 30.369973] swapper/0: page allocation failure: order:6, >>> mode:0x1(GFP_DMA), nodemask=3D(null),cpuset=3D/,mems_allowed=3D0 >>> [ 30.369980] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.7.0-rc3+ = #121 >>> [ 30.369981] Hardware name: Cavium Inc. Saber/Saber, BIOS >>> TX2-FW-Release-3.1-build_01-2803-g74253a541a mm/dd/yyyy >>> [ 30.369984] Call trace: >>> [ 30.369989] dump_backtrace+0x0/0x1f8 >>> [ 30.369991] show_stack+0x20/0x30 >>> [ 30.369997] dump_stack+0xc0/0x10c >>> [ 30.370001] warn_alloc+0x10c/0x178 >>> [ 30.370004] __alloc_pages_slowpath.constprop.111+0xb10/0xb50 >>> [ 30.370006] __alloc_pages_nodemask+0x2b4/0x300 >>> [ 30.370008] alloc_page_interleave+0x24/0x98 >>> [ 30.370011] alloc_pages_current+0xe4/0x108 >>> [ 30.370017] dma_atomic_pool_init+0x44/0x1a4 >>> [ 30.370020] do_one_initcall+0x54/0x228 >>> [ 30.370027] kernel_init_freeable+0x228/0x2cc >>> [ 30.370031] kernel_init+0x1c/0x110 >>> [ 30.370034] ret_from_fork+0x10/0x18 >>> [ 30.370036] Mem-Info: >>> [ 30.370064] active_anon:0 inactive_anon:0 isolated_anon:0 >>> [ 30.370064] active_file:0 inactive_file:0 isolated_file:0 >>> [ 30.370064] unevictable:0 dirty:0 writeback:0 unstable:0 >>> [ 30.370064] slab_reclaimable:34 slab_unreclaimable:4438 >>> [ 30.370064] mapped:0 shmem:0 pagetables:14 bounce:0 >>> [ 30.370064] free:1537719 free_pcp:219 free_cma:0 >>> [ 30.370070] Node 0 active_anon:0kB inactive_anon:0kB >>> active_file:0kB inactive_file:0kB unevictable:0kB isolated(anon):0kB >>> isolated(file):0kB mapped:0kB dirty:0kB writeback:0kB shmem:0kB >>> shmem_thp: 0kB shmem_pmdmapped: 0kB anon_thp: 0kB writeback_tmp:0kB >>> unstable:0kB all_unreclaimable? no >>> [ 30.370073] Node 1 active_anon:0kB inactive_anon:0kB >>> active_file:0kB inactive_file:0kB unevictable:0kB isolated(anon):0kB >>> isolated(file):0kB mapped:0kB dirty:0kB writeback:0kB shmem:0kB >>> shmem_thp: 0kB shmem_pmdmapped: 0kB anon_thp: 0kB writeback_tmp:0kB >>> unstable:0kB all_unreclaimable? no >>> [ 30.370079] Node 0 DMA free:0kB min:0kB low:0kB high:0kB >>> reserved_highatomic:0KB active_anon:0kB inactive_anon:0kB >>> active_file:0kB inactive_file:0kB unevictable:0kB writepending:0kB >>> present:128kB managed:0kB mlocked:0kB kernel_stack:0kB = pagetables:0kB >>> bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB >>> [ 30.370084] lowmem_reserve[]: 0 250 6063 6063 >>> [ 30.370090] Node 0 DMA32 free:256000kB min:408kB low:664kB >>> high:920kB reserved_highatomic:0KB active_anon:0kB inactive_anon:0kB >>> active_file:0kB inactive_file:0kB unevictable:0kB writepending:0kB >>> present:269700kB managed:256000kB mlocked:0kB kernel_stack:0kB >>> pagetables:0kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB >>> [ 30.370094] lowmem_reserve[]: 0 0 5813 5813 >>> [ 30.370100] Node 0 Normal free:5894876kB min:9552kB low:15504kB >>> high:21456kB reserved_highatomic:0KB active_anon:0kB = inactive_anon:0kB >>> active_file:0kB inactive_file:0kB unevictable:0kB writepending:0kB >>> present:8388608kB managed:5953112kB mlocked:0kB kernel_stack:21672kB >>> pagetables:56kB bounce:0kB free_pcp:876kB local_pcp:176kB = free_cma:0kB >>> [ 30.370104] lowmem_reserve[]: 0 0 0 0 >>> [ 30.370107] Node 0 DMA: 0*4kB 0*8kB 0*16kB 0*32kB 0*64kB 0*128kB >>> 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB =3D 0kB >>> [ 30.370113] Node 0 DMA32: 0*4kB 0*8kB 0*16kB 0*32kB 0*64kB = 0*128kB >>> 0*256kB 0*512kB 0*1024kB 1*2048kB (M) 62*4096kB (M) =3D 256000kB >>> [ 30.370119] Node 0 Normal: 2*4kB (M) 3*8kB (ME) 2*16kB (UE) = 3*32kB >>> (UM) 1*64kB (U) 2*128kB (M) 2*256kB (ME) 3*512kB (ME) 3*1024kB (ME) >>> 3*2048kB (UME) 1436*4096kB (M) =3D 5893600kB >>> [ 30.370129] Node 0 hugepages_total=3D0 hugepages_free=3D0 >>> hugepages_surp=3D0 hugepages_size=3D1048576kB >>> [ 30.370130] 0 total pagecache pages >>> [ 30.370132] 0 pages in swap cache >>> [ 30.370134] Swap cache stats: add 0, delete 0, find 0/0 >>> [ 30.370135] Free swap =3D 0kB >>> [ 30.370136] Total swap =3D 0kB >>> [ 30.370137] 2164609 pages RAM >>> [ 30.370139] 0 pages HighMem/MovableOnly >>> [ 30.370140] 612331 pages reserved >>> [ 30.370141] 0 pages hwpoisoned >>> [ 30.370143] DMA: failed to allocate 256 KiB pool for atomic >>> coherent allocation >>=20 >>=20 >> During my testing I saw the same error and Chen's solution corrected = it . >=20 > Which combination you are using on your side? I am using Prabhakar's > suggested environment and can reproduce the issue > with or without Chen's crashkernel support above 4G patchset. >=20 > I am also using a ThunderX2 platform with latest makedumpfile code and > kexec-tools (with the suggested patch > = ). >=20 > Thanks, > Bhupesh I did this activity 5 months ago and I have moved on to other = activities. My DMA failures were related to PCI devices that could not = be enumerated because low-DMA space was not available when = crashkernel was moved above 4G; I don=E2=80=99t recall the exact = platform.=20 For this failure ,=20 >>> DMA: failed to allocate 256 KiB pool for atomic >>> coherent allocation Is due to : 3618082c ("arm64 use both ZONE_DMA and ZONE_DMA32") With the introduction of ZONE_DMA to support the Raspberry DMA region below 1G, the crashkernel is placed in the upper 4G ZONE_DMA_32 region. Since the crashkernel does not have access to the ZONE_DMA region, it prints out call trace during bootup. It is due to having this CONFIG item ON : CONFIG_ZONE_DMA=3Dy Turning off ZONE_DMA fixes a issue and Raspberry PI 4 will use the device tree to specify memory below 1G. I would like to see Chen=E2=80=99s feature added , perhaps as = EXPERIMENTAL, so we can get some configuration testing done on it. It = corrects having a DMA zone in low memory while crash-kernel is above = 4GB. This has been going on for a year now.=20 Thank you, John. ( Note .. 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kexec-bounces+dwmw2=infradead.org@lists.infradead.org To: Bhupesh Sharma Cc: Devicetree List , Arnd Bergmann , Baoquan He , Linux Doc Mailing List , Chen Zhou , Catalin Marinas , RuiRui Yang , guohanjun@huawei.com, kexec mailing list , Linux Kernel Mailing List , Rob Herring , Simon Horman , James Morse , Prabhakar Kushwaha , Thomas Gleixner , Prabhakar Kushwaha , Will Deacon , Ingo Molnar , linux-arm-kernel SGkgLiAgU2VlIGJlbG93ICEgCgo+IE9uIEp1biAxLCAyMDIwLCBhdCA0OjAyIFBNLCBCaHVwZXNo IFNoYXJtYSA8YmhzaGFybWFAcmVkaGF0LmNvbT4gd3JvdGU6Cj4gCj4gSGkgSm9obiwKPiAKPiBP biBUdWUsIEp1biAyLCAyMDIwIGF0IDE6MDEgQU0gSm9obiBEb25uZWxseSA8Sm9obi5QLmRvbm5l bGx5QG9yYWNsZS5jb20+IHdyb3RlOgo+PiAKPj4gSGksCj4+IAo+PiAKPj4gT24gNi8xLzIwIDc6 MDIgQU0sIFByYWJoYWthciBLdXNod2FoYSB3cm90ZToKPj4+IEhpIENoZW4sCj4+PiAKPj4+IE9u IFRodSwgTWF5IDIxLCAyMDIwIGF0IDM6MDUgUE0gQ2hlbiBaaG91IDxjaGVuemhvdTEwQGh1YXdl aS5jb20+IHdyb3RlOgo+Pj4+IFRoaXMgcGF0Y2ggc2VyaWVzIGVuYWJsZSByZXNlcnZpbmcgY3Jh 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