From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933617AbcBACSD (ORCPT ); Sun, 31 Jan 2016 21:18:03 -0500 Received: from szxga03-in.huawei.com ([119.145.14.66]:9263 "EHLO szxga03-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933485AbcBACSB (ORCPT ); Sun, 31 Jan 2016 21:18:01 -0500 Message-ID: <56AEC026.2080509@huawei.com> Date: Mon, 1 Feb 2016 10:17:10 +0800 From: "Wangnan (F)" User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:31.0) Gecko/20100101 Thunderbird/31.6.0 MIME-Version: 1.0 To: Tong Zhang , , CC: LKML Subject: Re: [PATCH 1/1] broken perf tool on 4.4-rc1 References: <1454187764-12498-1-git-send-email-ztong@vt.edu> In-Reply-To: <1454187764-12498-1-git-send-email-ztong@vt.edu> Content-Type: text/plain; charset="utf-8"; format=flowed Content-Transfer-Encoding: 7bit X-Originating-IP: [10.111.66.109] X-CFilter-Loop: Reflected X-Mirapoint-Virus-RAPID-Raw: score=unknown(0), refid=str=0001.0A020206.56AEC043.014C,ss=1,re=0.000,recu=0.000,reip=0.000,cl=1,cld=1,fgs=0, ip=0.0.0.0, so=2013-05-26 15:14:31, dmn=2013-03-21 17:37:32 X-Mirapoint-Loop-Id: 7557b4d439456819f71932297b2ee6d8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2016/1/31 5:02, Tong Zhang wrote: > reproduce: > lzto@objd ~ $ ~/linux/tools/perf/perf record -I -e intel_pt/tsc=1,noretcomp=1/u /bin/ls > lzto@objd ~ $ ~/linux/tools/perf/perf script -F event,comm,pid,tid,time,addr,ip,sym,dso,iregs > Segmentation fault > lzto@objd ~ $ > > Upon further investigation, it seems that > commit 747a9b0a08ae ("Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip") > breaks perf tool. > > __list_del(): tools/include/linux/list.h does not check null pointer dereference I don't have a Boradwell system, unable to reproduce the fault. Could you please give the output of gdb's bt command? We should try to fix the inappropriate list operation. Thank you.