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[209.132.180.67]) by mx.google.com with ESMTP id i4-v6si3743170pgk.2.2018.07.18.09.39.07; Wed, 18 Jul 2018 09:39:23 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731422AbeGRRQd (ORCPT + 99 others); Wed, 18 Jul 2018 13:16:33 -0400 Received: from mx3.molgen.mpg.de ([141.14.17.11]:38853 "EHLO mx1.molgen.mpg.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1731193AbeGRRQd (ORCPT ); Wed, 18 Jul 2018 13:16:33 -0400 Received: from keineahnung.molgen.mpg.de (keineahnung.molgen.mpg.de [141.14.17.193]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: pmenzel) by mx.molgen.mpg.de (Postfix) with ESMTPSA id BFEFA2012BA068; Wed, 18 Jul 2018 18:37:46 +0200 (CEST) Subject: Re: NULL pointer dereference in msi_set_mask_bit To: Thomas Gleixner Cc: Bjorn Helgaas , Bjorn Helgaas , linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, Marc Zyngier References: <20180718140636.GD128988@bhelgaas-glaptop.roam.corp.google.com> <6339fdef-a335-b833-4022-23725fd86d9e@molgen.mpg.de> From: Paul Menzel Message-ID: <178bb701-56af-06cf-4836-1a26e74f2b07@molgen.mpg.de> Date: Wed, 18 Jul 2018 18:37:46 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.8.0 MIME-Version: 1.0 In-Reply-To: Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="------------ms070600080708010209040409" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This is a cryptographically signed message in MIME format. --------------ms070600080708010209040409 Content-Type: multipart/mixed; boundary="------------3B68743274E29E999A7F8554" Content-Language: en-US This is a multi-part message in MIME format. --------------3B68743274E29E999A7F8554 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable [I removed the folks from the unrelated patches.] Dear Thomas, On 07/18/18 17:39, Thomas Gleixner wrote: > On Wed, 18 Jul 2018, Paul Menzel wrote: >> On 07/18/18 17:02, Thomas Gleixner wrote: >>>>> 93.885: [ 23.020572] BUG: unable to handle kernel NULL pointer de= reference at 000000000000003c >>>>> 93.885: [ 23.029011] PGD 0 P4D 0=20 >>>>> 93.885: [ 23.031670] Oops: 0000 [#1] SMP NOPTI >>>>> 93.885: [ 23.035455] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.= 18.0-rc5+ #1 >>>>> 93.885: [ 23.042079] Hardware name: MSI MS-7A37/B350M MORTAR (MS-= 7A37), BIOS 1.G1 05/17/2018 >>>>> 93.886: [ 23.049868] RIP: 0010:msi_set_mask_bit+0xe/0x70 >>> >>>>> 93.913: [ 23.049868] Code: 00 53 48 89 fb e8 12 f8 ff ff 48 89 df= 5b e9 c9 fe ff ff 66 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 53 48 8b 47 = 10 48 8b 58 10 43 3c 01 74 3c 8b 15 2e 85 21 01 31 c0 85 d2 75 25 8b= 43 38 48 >>> >>> f6 43 3c 01 testb $0x1,0x3c(%rbx) >>> >>> That's: >>> >>> if (desc->msi_attrib.is_msix) >> >> Is there a tool to translate that? >=20 > That tool is called brain :) >=20 > Seriously, what you can do is run the 'Code: ...' line through > scripts/decodecode and that will show you the disassembly. Now staring = at > msi_set_mask_bit() makes it pretty obvious which part it is and the off= set of > msi_attrib in msi_desc is 0x3c, which matches the BUG: line above. You = can > figure that out by counting or by using pahole. >=20 > Of course if you have the vmlinux around then scripts/faddr2line is wha= t > you want to use. Thank you for the explanation. I=E2=80=99ll keep that in mind for the fut= ure. >>>>> 93.957: [ 23.049880] RSP: 0018:ffff9e8e5e803f78 EFLAGS: 00010046 >>>>> 93.957: [ 23.049881] RAX: ffff9e8e45919000 RBX: 0000000000000000 = RCX: 0000000000000000 >>>>> 93.958: [ 23.049882] RDX: ffff9e8e45919000 RSI: 0000000000000001 = RDI: ffff9e8e45919098 >>>>> 93.958: [ 23.049882] RBP: ffff9e8e45919098 R08: 0000000000000000 = R09: 0000000000000000 >>>>> 93.958: [ 23.049882] R10: 0000000000000000 R11: 0000000000000000 = R12: ffff9e8e45919000 >>>>> 93.958: [ 23.049883] R13: 0000000000000027 R14: 0000000000000000 = R15: 0000000000000000 >>>>> 93.959: [ 23.049884] FS: 0000000000000000(0000) GS:ffff9e8e5e800= 000(0000) knlGS:0000000000000000 >>>>> 93.959: [ 23.049884] CS: 0010 DS: 0000 ES: 0000 CR0: 00000000800= 50033 >>>>> 93.959: [ 23.049885] CR2: 000000000000003c CR3: 00000003fc5a4000 = CR4: 00000000003406f0 >>>>> 93.959: [ 23.049885] Call Trace: >>>>> 93.959: [ 23.049887] >>>>> 93.960: [ 23.049889] __irq_move_irq+0x3c/0x70 >>>>> 93.960: [ 23.049892] apic_ack_irq+0x2b/0x30 >>>>> 93.960: [ 23.049893] handle_edge_irq+0x7d/0x1d0 >>>>> 93.960: [ 23.049895] handle_irq+0x1f/0x30 >>>>> 93.960: [ 23.049898] do_IRQ+0x41/0xc0 >>>>> 93.960: [ 23.049899] common_interrupt+0xf/0xf >>>>> 93.961: [ 23.049900] >>> >>> and desc comes from irq_data->common->msi_desc >>> >>> I have no idea how that can happen for an MSI interrupt. >>> >>> Paul, is this reproducible? >> >> No, unfortunately not. I only hit this once, since I attached the seri= al >> console. >=20 > Bah. Could you please enable GENERIC_IRQ_DEBUGFS and after a successful= > boot up provide me the content of all files in /sys/kernel/debug/irq/ a= nd > its subfolders? Sure, please find them attached. `7zr x sys-kernel-debug-irq.7z` should extract it. ``` $ sudo ls -R /sys/kernel/debug/irq/ /sys/kernel/debug/irq/: domains irqs /sys/kernel/debug/irq/domains: AMD-IR-0 AMD-IR-MSI-0-2 default IO-APIC-IR-0 IO-APIC-IR-1 PCI-MSI-2 = VECTOR /sys/kernel/debug/irq/irqs: 0 11 14 24 27 3 32 35 38 40 43 46 49 51 54 6 9 1 12 15 25 28 30 33 36 39 41 44 47 5 52 55 7 10 13 2 26 29 31 34 37 4 42 45 48 50 53 56 8 ``` > I assume you have irqbalanced running, right? Yes, I do. ``` $ systemctl status irqbalance =E2=97=8F irqbalance.service - irqbalance daemon Loaded: loaded (/lib/systemd/system/irqbalance.service; enabled; vendo= r preset: enabled) Active: active (running) since Wed 2018-07-18 18:26:05 CEST; 5min ago Main PID: 491 (irqbalance) Tasks: 2 (limit: 4915) Memory: 1.4M CGroup: /system.slice/irqbalance.service =E2=94=94=E2=94=80491 /usr/sbin/irqbalance --foreground Jul 18 18:26:05 tokeiihto systemd[1]: Started irqbalance daemon. ``` Kind regards, Paul --------------3B68743274E29E999A7F8554 Content-Type: application/x-7z-compressed; name="sys-kernel-debug-irq.7z" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="sys-kernel-debug-irq.7z" N3q8ryccAASOnsReKAEAAAAAAAAiAAAAAAAAAD/eS3MAAIGDn3CqAaAlOd+TL4I7big6ZIfB atwb8aMCVdWzInGe28D1nZKVy2yx1ftL0OGsU2DVKUkHTQe0GQyi4t3rEV/FWr3B/+nWR3YQ 6lz6Nek4BCSWhro/czjHKqtRG40MqbMOImKRXq0wF7GqujuOht8YmPSDIFhAD0l7dfLBL0EV 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