From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753618AbcEPNbN (ORCPT ); Mon, 16 May 2016 09:31:13 -0400 Received: from smtp1.it.da.ut.ee ([193.40.5.66]:54719 "EHLO smtp1.it.da.ut.ee" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753267AbcEPNbJ (ORCPT ); Mon, 16 May 2016 09:31:09 -0400 Date: Mon, 16 May 2016 16:16:52 +0300 (EEST) From: Meelis Roos To: Linux Kernel list , dri-devel@lists.freedesktop.org Subject: Radeon R100 UBSAN warning Message-ID: User-Agent: Alpine 2.20 (LRH 67 2015-01-07) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org I am seeing the following UBSAN warning on three of my computers (4.6.0 with UBSAN turned on). I am reporting this because some of the UBSAN reports have been correct (some have been false positives though). [ 9.372287] ================================================================================ [ 9.372423] UBSAN: Undefined behaviour in drivers/gpu/drm/radeon/r100.c:595:15 [ 9.372559] shift exponent 255 is too large for 32-bit type 'int' [ 9.372696] CPU: 0 PID: 222 Comm: systemd-udevd Not tainted 4.6.0 #129 [ 9.372831] Hardware name: MicroLink /D850MV , BIOS MV85010A.86A.0067.P24.0304081124 04/08/2003 [ 9.373058] 00000000 c12244c8 f8df9704 c1224aa4 f8df96d4 00000001 00000202 00353532 [ 9.373516] 00000236 00000246 00000246 00000006 00000000 00010246 0000001c 00000006 [ 9.373972] c17f6842 00000031 c1074ab1 00000000 00000000 00000246 00000002 f4a06800 [ 9.374427] Call Trace: [ 9.374567] [] ? ubsan_epilogue+0x8/0x23 [ 9.374704] [] ? __ubsan_handle_shift_out_of_bounds+0xd5/0xdd [ 9.374843] [] ? vprintk_emit+0x37a/0x390 [ 9.375156] [] ? r100_hpd_init+0x72/0xb7 [radeon] [ 9.375437] [] ? radeon_modeset_init+0x753/0xe7b [radeon] [ 9.375719] [] ? radeon_driver_load_kms+0xd8/0x196 [radeon] [ 9.375884] [] ? drm_dev_register+0x75/0xad [drm] [ 9.376041] [] ? drm_get_pci_dev+0x11d/0x23e [drm] [ 9.376135] [] ? pci_device_probe+0x9f/0xee [ 9.376135] [] ? driver_probe_device+0x149/0x271 [ 9.376135] [] ? __driver_attach+0x86/0xa1 [ 9.376135] [] ? bus_for_each_dev+0x47/0x5a [ 9.376135] [] ? driver_attach+0x24/0x27 [ 9.376135] [] ? driver_probe_device+0x271/0x271 [ 9.376135] [] ? bus_add_driver+0xed/0x1db [ 9.376135] [] ? 0xf8e58000 [ 9.376135] [] ? driver_register+0x9a/0xcb [ 9.376135] [] ? do_one_initcall+0x159/0x1d9 [ 9.376135] [] ? __free_one_page+0x1a1/0x369 [ 9.376135] [] ? kernel_poison_pages+0x10/0xc4 [ 9.376135] [] ? free_pages_prepare+0x1f7/0x21c [ 9.376135] [] ? kmem_cache_alloc+0xa2/0xd6 [ 9.376135] [] ? do_init_module+0x17/0x21a [ 9.376135] [] ? do_init_module+0x76/0x21a [ 9.376135] [] ? load_module+0x1b28/0x206a [ 9.376135] [] ? SyS_finit_module+0x71/0x79 [ 9.376135] [] ? do_fast_syscall_32+0xd9/0x111 [ 9.376135] [] ? sysenter_past_esp+0x40/0x6a [ 9.376135] ================================================================================ -- Meelis Roos (mroos@linux.ee)