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=-0.7 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 BF720C4321A for ; Fri, 28 Jun 2019 03:17:19 +0000 (UTC) Received: from lists.ozlabs.org (lists.ozlabs.org [203.11.71.2]) (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 0DCBA206A2 for ; Fri, 28 Jun 2019 03:17:18 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 0DCBA206A2 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=ellerman.id.au Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 45ZhlJ0cGYzDqhR for ; Fri, 28 Jun 2019 13:17:16 +1000 (AEST) Received: from ozlabs.org (bilbo.ozlabs.org [203.11.71.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 45ZhfG1M8tzDqg9 for ; Fri, 28 Jun 2019 13:12:54 +1000 (AEST) Authentication-Results: lists.ozlabs.org; dmarc=none (p=none dis=none) header.from=ellerman.id.au Received: from authenticated.ozlabs.org (localhost [127.0.0.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange ECDHE (P-256) server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by mail.ozlabs.org (Postfix) with ESMTPSA id 45ZhfD3QYHz9s3l; Fri, 28 Jun 2019 13:12:52 +1000 (AEST) From: Michael Ellerman To: Qian Cai , "Aneesh Kumar K.V" , Anju T Sudhakar Subject: Re: power9 NUMA crash while reading debugfs imc_cmd In-Reply-To: <1561670472.5154.98.camel@lca.pw> References: <1561670472.5154.98.camel@lca.pw> Date: Fri, 28 Jun 2019 13:12:48 +1000 Message-ID: <87lfxms8r3.fsf@concordia.ellerman.id.au> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" Qian Cai writes: > Read of=C2=A0debugfs imc_cmd file for a memory-less node will trigger a c= rash below > on this power9 machine which has the following NUMA layout. What type of machine is it? cheers > I don't understand why I only saw it recently on linux-next where it > was tested everyday. I can reproduce it back to 4.20 where 4.18 seems > work fine. > > # cat /sys/kernel/debug/powerpc/imc/imc_cmd_252 (On a 4.18-based kernel) > 0x0000000000000000 > > # numactl -H > available: 6 nodes (0,8,252-255) > node 0 cpus: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 2= 3 24 25 > 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 5= 0 51 52 > 53 54 55 56 57 58 59 60 61 62 63 > node 0 size: 130210 MB > node 0 free: 128406 MB > node 8 cpus: 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 = 84 85 > 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107= 108 > 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 1= 27 > node 8 size: 130784 MB > node 8 free: 130051 MB > node 252 cpus: > node 252 size: 0 MB > node 252 free: 0 MB > node 253 cpus: > node 253 size: 0 MB > node 253 free: 0 MB > node 254 cpus: > node 254 size: 0 MB > node 254 free: 0 MB > node 255 cpus: > node 255 size: 0 MB > node 255 free: 0 MB > node distances: > node=C2=A0=C2=A0=C2=A00=C2=A0=C2=A0=C2=A08=C2=A0=C2=A0252=C2=A0=C2=A0253= =C2=A0=C2=A0254=C2=A0=C2=A0255=C2=A0 > =C2=A0 0:=C2=A0=C2=A010=C2=A0=C2=A040=C2=A0=C2=A080=C2=A0=C2=A080=C2=A0= =C2=A080=C2=A0=C2=A080=C2=A0 > =C2=A0 8:=C2=A0=C2=A040=C2=A0=C2=A010=C2=A0=C2=A080=C2=A0=C2=A080=C2=A0= =C2=A080=C2=A0=C2=A080=C2=A0 > =C2=A0252:=C2=A0=C2=A080=C2=A0=C2=A080=C2=A0=C2=A010=C2=A0=C2=A080=C2=A0= =C2=A080=C2=A0=C2=A080=C2=A0 > =C2=A0253:=C2=A0=C2=A080=C2=A0=C2=A080=C2=A0=C2=A080=C2=A0=C2=A010=C2=A0= =C2=A080=C2=A0=C2=A080=C2=A0 > =C2=A0254:=C2=A0=C2=A080=C2=A0=C2=A080=C2=A0=C2=A080=C2=A0=C2=A080=C2=A0= =C2=A010=C2=A0=C2=A080=C2=A0 > =C2=A0255:=C2=A0=C2=A080=C2=A0=C2=A080=C2=A0=C2=A080=C2=A0=C2=A080=C2=A0= =C2=A080=C2=A0=C2=A010 > > # cat /sys/kernel/debug/powerpc/imc/imc_cmd_252 > > [ 1139.415461][ T5301] Faulting instruction address: 0xc0000000000d0d58 > [ 1139.415492][ T5301] Oops: Kernel access of bad area, sig: 11 [#1] > [ 1139.415509][ T5301] LE PAGE_SIZE=3D64K MMU=3DRadix MMU=3DHash SMP NR_C= PUS=3D256 > DEBUG_PAGEALLOC NUMA PowerNV > [ 1139.415542][ T5301] Modules linked in: i2c_opal i2c_core ip_tables x_t= ables > xfs sd_mod bnx2x mdio ahci libahci tg3 libphy libata firmware_class dm_mi= rror > dm_region_hash dm_log dm_mod > [ 1139.415595][ T5301] CPU: 67 PID: 5301 Comm: cat Not tainted 5.2.0-rc6-= next- > 20190627+ #19 > [ 1139.415634][ T5301] NIP:=C2=A0=C2=A0c0000000000d0d58 LR: c00000000049a= a18 CTR: > c0000000000d0d50 > [ 1139.415675][ T5301] REGS: c00020194548f9e0 TRAP: 0300=C2=A0=C2=A0=C2= =A0Not tainted=C2=A0=C2=A0(5.2.0- > rc6-next-20190627+) > [ 1139.415705][ T5301] MSR:=C2=A0=C2=A09000000000009033 =C2=A0=C2=A0CR: > 28022822=C2=A0=C2=A0XER: 00000000 > [ 1139.415777][ T5301] CFAR: c00000000049aa14 DAR: 000000000003fc08 DSISR: > 40000000 IRQMASK: 0=C2=A0 > [ 1139.415777][ T5301] GPR00: c00000000049aa18 c00020194548fc70 c00000000= 16f8b00 > 000000000003fc08=C2=A0 > [ 1139.415777][ T5301] GPR04: c00020194548fcd0 0000000000000000 000000001= 4884e73 > ffffffff00011eaa=C2=A0 > [ 1139.415777][ T5301] GPR08: 000000007eea5a52 c0000000000d0d50 000000000= 0000000 > 0000000000000000=C2=A0 > [ 1139.415777][ T5301] GPR12: c0000000000d0d50 c000201fff7f8c00 000000000= 0000000 > 0000000000000000=C2=A0 > [ 1139.415777][ T5301] GPR16: 000000000000000d 00007fffeb0c3368 fffffffff= fffffff > 0000000000000000=C2=A0 > [ 1139.415777][ T5301] GPR20: 0000000000000000 0000000000000000 000000000= 0000000 > 0000000000020000=C2=A0 > [ 1139.415777][ T5301] GPR24: 0000000000000000 0000000000000000 000000000= 0020000 > 000000010ec90000=C2=A0 > [ 1139.415777][ T5301] GPR28: c00020194548fdf0 c00020049a584ef8 000000000= 0000000 > c00020049a584ea8=C2=A0 > [ 1139.416116][ T5301] NIP [c0000000000d0d58] imc_mem_get+0x8/0x20 > [ 1139.416143][ T5301] LR [c00000000049aa18] simple_attr_read+0x118/0x170 > [ 1139.416158][ T5301] Call Trace: > [ 1139.416182][ T5301] [c00020194548fc70] [c00000000049a970] > simple_attr_read+0x70/0x170 (unreliable) > [ 1139.416255][ T5301] [c00020194548fd10] [c00000000054385c] > debugfs_attr_read+0x6c/0xb0 > [ 1139.416305][ T5301] [c00020194548fd60] [c000000000454c1c] > __vfs_read+0x3c/0x70 > [ 1139.416363][ T5301] [c00020194548fd80] [c000000000454d0c] vfs_read+0xb= c/0x1a0 > [ 1139.416392][ T5301] [c00020194548fdd0] [c00000000045519c] > ksys_read+0x7c/0x140 > [ 1139.416434][ T5301] [c00020194548fe20] [c00000000000b108] > system_call+0x5c/0x70 > [ 1139.416473][ T5301] Instruction dump: > [ 1139.416511][ T5301] 4e800020 60000000 7c0802a6 60000000 7c801d28 38600= 000 > 4e800020 60000000=C2=A0 > [ 1139.416572][ T5301] 60000000 60000000 7c0802a6 60000000 <7d201c28> 386= 00000 > f9240000 4e800020=C2=A0 > [ 1139.416636][ T5301] ---[ end trace c44d1fb4ace04784 ]--- > [ 1139.520686][ T5301]=C2=A0 > [ 1140.520820][ T5301] Kernel panic - not syncing: Fatal exception