Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751212AbbGLQdd (ORCPT ); Sun, 12 Jul 2015 12:33:33 -0400 Received: from mail-wi0-f194.google.com ([209.85.212.194]:35587 "EHLO mail-wi0-f194.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750935AbbGLQdc convert rfc822-to-8bit (ORCPT ); Sun, 12 Jul 2015 12:33:32 -0400 MIME-Version: 1.0 In-Reply-To: References: Date: Sun, 12 Jul 2015 18:33:30 +0200 Message-ID: Subject: Re: [4.2.0-rc1-00201-g59c3cb5] Regression: kernel NULL pointer dereference From: =?UTF-8?Q?J=C3=B6rg_Otte?= To: David Airlie , Linus Torvalds , Daniel Vetter , dri-devel@lists.freedesktop.org, Linux Kernel Mailing List , Ander Conselvan de Oliveira Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3156 Lines: 67 2015-07-12 10:03 GMT+02:00 Jörg Otte : > 4.2.0-rc1-00201-g59c3cb5 introducued a null pointer derefence and a > system freeze > when Xorg is started ( 4.2.0-rc1-00062-gc4b5fd3 was fine) : > > BUG: unable to handle kernel NULL pointer dereference at 0000000000000009 > IP: [] 0xffffffffbd3447bb > PGD 0 > Oops: 0000 [#1] SMP > CPU: 1 PID: 1290 Comm: Xorg Not tainted 4.2.0-rc1-00201-g59c3cb5 #6 > Hardware name: FUJITSU LIFEBOOK AH532/FJNBB1C, BIOS Version 1.09 05/22/2012 > task: ffff8802149d6c00 ti: ffff880206df4000 task.ti: ffff880206df4000 > RIP: 0010:[] [] 0xffffffffbd3447bb > RSP: 0018:ffff880206df7b08 EFLAGS: 00010246 > RAX: 0000000000000000 RBX: ffff88021578f480 RCX: ffff88021578f4d0 > RDX: 0000000000000000 RSI: ffff88021630b000 RDI: ffff880214a68000 > RBP: ffff88021630b000 R08: ffff88021578f4e0 R09: ffff88021578f4f0 > R10: 0000000000003c18 R11: 00000000fffffff2 R12: ffff880214a68000 > R13: ffff88021634e800 R14: 0000000000000000 R15: 0000000000000000 > FS: 00007ff3caa60880(0000) GS:ffff88021f280000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 0000000000000009 CR3: 0000000206e07000 CR4: 00000000001407e0 > Stack: > ffff880200010000 ffff880200010000 ffff880200000000 ffff880200000001 > ffff88021578f500 ffffffffbd2df135 ffff880213f71c00 ffff880214a68000 > 0000000000000000 ffff880214a70000 0000000000000001 ffff880214a68000 > Call Trace: > [] ? 0xffffffffbd2df135 > [] ? 0xffffffffbd2b6ca8 > [] ? 0xffffffffbd33cc7e > [] ? 0xffffffffbd343673 > [] ? 0xffffffffbd2d0728 > [] ? 0xffffffffbd2d088e > [] ? 0xffffffffbd2d10c5 > [] ? 0xffffffffbd2c6976 > [] ? 0xffffffffbd2d0fe0 > [] ? 0xffffffffbd0c6a1f > [] ? 0xffffffffbd0e79e1 > [] ? 0xffffffffbd0e7ed1 > [] ? 0xffffffffbd6df557 > Code: 48 89 54 24 20 48 8b 54 24 40 48 89 ee 89 0c 24 4c 89 f9 c7 44 > 24 18 01 00 00 00 89 44 24 08 e8 bc 1f f7 ff 85 c0 41 89 c7 75 67 <41> > 80 7e 09 00 74 56 49 8b 84 24 38 02 00 00 c6 85 d0 08 00 00 > RIP [] 0xffffffffbd3447bb > RSP > CR2: 0000000000000009 > ---[ end trace dd0931f7f0d43d12 ] --- I can fix the problem for me by reverting: commit dec4f799d0a4c9edae20512fa60b0a36f3299ca2 Author: Daniel Vetter Date: Tue Jul 7 11:15:47 2015 +0200 drm/i915: Use crtc_state->active in primary check_plane func Since commit 8c7b5ccb729870e606321b3703e2c2e698c49a95 Author: Ander Conselvan de Oliveira Date: Tue Apr 21 17:13:19 2015 +0300 drm/i915: Use atomic helpers for computing changed flags Thanks, Jörg -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/