From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753279AbdLNPYm (ORCPT ); Thu, 14 Dec 2017 10:24:42 -0500 Received: from mail-eopbgr20083.outbound.protection.outlook.com ([40.107.2.83]:53152 "EHLO EUR02-VE1-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752671AbdLNPYi (ORCPT ); Thu, 14 Dec 2017 10:24:38 -0500 Authentication-Results: spf=none (sender IP is ) smtp.mailfrom=Dave.Martin@arm.com; Date: Thu, 14 Dec 2017 15:24:32 +0000 From: Dave P Martin To: Geert Uytterhoeven Cc: Catalin Marinas , Will Deacon , "linux-arm-kernel@lists.infradead.org" , Linux-Renesas , Linux Kernel Mailing List , Alex =?iso-8859-1?Q?Benn=E9e?= , Ard Biesheuvel Subject: Re: arm64: unhandled level 0 translation fault Message-ID: <20171214152431.GC12608@e103592.cambridge.arm.com> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline 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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 14 Dec 2017 15:24:35.6450 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 66d57300-2184-4717-a5bc-08d54306c8cc X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-Transport-CrossTenantHeadersStamped: DB6PR0801MB2022 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by nfs id vBEFOo4Z030253 On Thu, Dec 14, 2017 at 02:34:50PM +0000, Geert Uytterhoeven wrote: > Hi Catalin, Will, Dave, > > On Tue, Dec 12, 2017 at 11:20 AM, Geert Uytterhoeven > wrote: > > During userspace (Debian jessie NFS root) boot on arm64: > > > > rpcbind[1083]: unhandled level 0 translation fault (11) at 0x00000008, > > esr 0x92000004, in dash[aaaaadf77000+1a000] > > CPU: 0 PID: 1083 Comm: rpcbind Not tainted > > 4.15.0-rc3-arm64-renesas-02176-g14f9a1826e48e355 #51 > > Hardware name: Renesas Salvator-X 2nd version board based on r8a7795 ES2.0+ (DT) > > This is a quad Cortex A57. > > > pstate: 80000000 (Nzcv daif -PAN -UAO) > > pc : 0xaaaaadf8a51c > > lr : 0xaaaaadf8ac08 > > sp : 0000ffffcffeac00 > > x29: 0000ffffcffeac00 x28: 0000aaaaadfa1000 > > x27: 0000ffffcffebf7c x26: 0000ffffcffead20 > > x25: 0000aaaacea1c5f0 x24: 0000000000000000 > > x23: 0000aaaaadfa1000 x22: 0000aaaaadfa1000 > > x21: 0000000000000000 x20: 0000000000000008 > > x19: 0000000000000000 x18: 0000ffffcffeb500 > > x17: 0000ffffa22babfc x16: 0000aaaaadfa1ae8 > > x15: 0000ffffa2363588 x14: ffffffffffffffff > > x13: 0000000000000020 x12: 0000000000000010 > > x11: 0101010101010101 x10: 0000aaaaadfa1000 > > x9 : 00000000ffffff81 x8 : 0000aaaaadfa2000 > > x7 : 0000000000000000 x6 : 0000000000000000 > > x5 : 0000aaaaadfa2338 x4 : 0000aaaaadfa2000 > > x3 : 0000aaaaadfa2338 x2 : 0000000000000000 > > x1 : 0000aaaaadfa28b0 x0 : 0000aaaaadfa4c30 > > > > Sometimes it happens with other processes, but the main address, esr, and > > pstate values are always the same. > > > > I regularly run arm64/for-next/core (through bi-weekly renesas-drivers > > releases, so the last time was two weeks ago), but never saw the issue > > before until today, so probably v4.15-rc1 is OK. > > Unfortunately it doesn't happen during every boot, which makes it > > cumbersome to bisect. > > > > My first guess was UNMAP_KERNEL_AT_EL0, but even after disabling that, > > and even without today's arm64/for-next/core merged in, I still managed to > > reproduce the issue, so I believe it was introduced in v4.15-rc2 or > > v4.15-rc3. > > > > Once, when the kernel message above wasn't shown, I got an error from > > userspace, which may be related: > > *** Error in `/bin/sh': free(): invalid pointer: 0x0000aaaadd970988 *** > > With more boots (10 instead of 6) to declare a kernel good, I bisected this > to commit 9de52a755cfb6da5 ("arm64: fpsimd: Fix failure to restore FPSIMD > state after signals"). > > Reverting that commit on top of v4.15-rc3 fixed the issue for me. Good work on the bisect -- I'll need to have a think about this... That patch fixes a genuine problem so we can't just revert it. What if you revert _just this function_ back to what it was in v4.14? Cheers ---Dave IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. If you are not the intended recipient, please notify the sender immediately and do not disclose the contents to any other person, use it for any purpose, or store or copy the information in any medium. Thank you.