Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755491AbcDNNvq (ORCPT ); Thu, 14 Apr 2016 09:51:46 -0400 Received: from mout.gmx.net ([212.227.15.19]:53802 "EHLO mout.gmx.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754571AbcDNNvp (ORCPT ); Thu, 14 Apr 2016 09:51:45 -0400 Subject: Re: 4.6.0-rc3 UBSAN: atomic.h:156:2,Apr 14 15:40:24 n22kvm-clone kernel: signed integer overflow: To: x86@kernel.org References: <570F9F21.7000209@gmx.de> Cc: Linux Kernel From: =?UTF-8?Q?Toralf_F=c3=b6rster?= Message-ID: <570FA064.1060707@gmx.de> Date: Thu, 14 Apr 2016 15:51:32 +0200 MIME-Version: 1.0 In-Reply-To: <570F9F21.7000209@gmx.de> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Provags-ID: V03:K0:FPpNRpx0rZ3h7ABmEjRupQSi0cOX2dfwpT7/83nnU+qQun56m7E GmRnfwhrxdAn4ZkM84cmr3EQcQ96rp1bTIDUflwVkUWWTNOwTtwKISVkDt+coCzGgainUYU x0r/oYom6dPoPTAOIawNtfb9cJV2eL5uRRPAqsIgv/NwnHXYvPRXurmtS9LgL9IlqzcGS/x OANN2ejzcu2TVm/7RIa9Q== X-UI-Out-Filterresults: notjunk:1;V01:K0:xgPeA+8EwVw=:bHIcq7g6WkZ7gzJemmnCcJ txLkOQNDgEG9OkU43uPm5O6y2Auv86xGj/GIjxdwxACCcnewe9pHAnKuZdS8haxwO6VvyEUCD Y/8RfbCN4gHBrIbi2dVUXGTOnLPRfPKmEbUw1y1y5X+HtRGMhnn70jxJ+/jmd2G/s6xCGHHNh c2nx9+Q24GCin0T5s/oPJA22KLcBCPLf104z6NIPKm22EXuxycTsQF/5JUqOsn/ttlU39CGKm UuQ5ZHSVV9m6xVZmUeq1KW4PtlRXT/1IG6XyqSae1HTtToi30PEtW4k99Q2ZzVuHU6GBBojma XJf7sQ1Zuu0gacVNjak/RReEPgorehvibZL28mSFBvpYw2bYgg5R3IpVlevomYneiEbrFKar1 sVxHA+laglbvDBuBaQlGDhK361m2SLO3oJxO+6apwV56SVpNQHyshlOmWsSfyEQ2eDxU5f/R1 iiEM6kysX71YePVIOBiD6XYLZ6R74MXnVrKiZq92rdVUu4wDlDFbhqQFGku6TBbW6g/Yhcpcc 87vgkAOiL5Qiy3+/sGiVBeQ2h4JwLaZwX4wvqod8Mrz+SmuIweHSonZJexaHfDhZ63J6dDiCk NO/UYJxezUx2NVmlNfxUQXmpUdPGXVOaw/EOgHKB5s1p9UXZ8sb0FAzVELTMUM2kdEAGjAv2J +EoqQuMJhZjY/UIf9/zo0wSEichr0fe6598u3s34GBe5L4bm6IU0XytOPmBoKrOEILEfU8zC2 hLf2tFBxB5XPFGYyrePz2z79KcdIS0eQZAv2Gi8J8fTzGYkO7rlPiCdiW7pwFlGDTrBOkPgMU WW7ycvbhRXKqKOhGcjWkgQ2oF1Wdg== Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2065 Lines: 31 Toralf Förster: > Got this at a 32 bit KVM during boot : and later while fuzzying with trinity : Apr 14 15:44:56 n22kvm-clone kernel: ================================================================================ Apr 14 15:44:56 n22kvm-clone kernel: UBSAN: Undefined behaviour in ./arch/x86/include/asm/futex.h:53:13 Apr 14 15:44:56 n22kvm-clone kernel: shift exponent -1 is negative Apr 14 15:44:56 n22kvm-clone kernel: CPU: 0 PID: 13969 Comm: trinity-c1 Not tainted 4.6.0-rc3 #5 Apr 14 15:44:56 n22kvm-clone kernel: Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.8.2-0-g33fbe13 by qemu-project.org 04/01/2014 Apr 14 15:44:56 n22kvm-clone kernel: 00000000 00000086 f3e7fde8 d6fe2fe8 00000007 f3e7fe14 d78b8dac f3e7fdf8 Apr 14 15:44:56 n22kvm-clone kernel: d704887e f3e7fdf8 d78b8dac f3e7fe78 d704919d d774876c f3e7fe18 00000002 Apr 14 15:44:56 n22kvm-clone kernel: f3e16180 00000001 00000286 d600312d f3e7fe5c 00000286 00000000 00000001 Apr 14 15:44:56 n22kvm-clone kernel: Call Trace: Apr 14 15:44:56 n22kvm-clone kernel: [] dump_stack+0x9f/0xe7 Apr 14 15:44:56 n22kvm-clone kernel: [] ubsan_epilogue+0xe/0x40 Apr 14 15:44:56 n22kvm-clone kernel: [] __ubsan_handle_shift_out_of_bounds+0xdd/0x140 Apr 14 15:44:56 n22kvm-clone kernel: [] ? do_futex+0x257/0xdc0 Apr 14 15:44:56 n22kvm-clone kernel: [] ? _raw_spin_lock_nested+0x3d/0x50 Apr 14 15:44:56 n22kvm-clone kernel: [] do_futex+0xa04/0xdc0 Apr 14 15:44:56 n22kvm-clone kernel: [] ? _raw_spin_unlock_irqrestore+0x5f/0x80 Apr 14 15:44:56 n22kvm-clone kernel: [] SyS_futex+0x84/0x150 Apr 14 15:44:56 n22kvm-clone kernel: [] do_fast_syscall_32+0x150/0x960 Apr 14 15:44:56 n22kvm-clone kernel: [] ? do_futex+0xdc0/0xdc0 Apr 14 15:44:56 n22kvm-clone kernel: [] sysenter_past_esp+0x4c/0x7f Apr 14 15:44:56 n22kvm-clone kernel: ================================================================================ -- Toralf PGP: C4EACDDE 0076E94E, OTR: 420E74C8 30246EE7