From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754642AbeDTLIE (ORCPT ); Fri, 20 Apr 2018 07:08:04 -0400 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:39964 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754549AbeDTLID (ORCPT ); Fri, 20 Apr 2018 07:08:03 -0400 Subject: Re: [gcov_module_notifier] WARNING: CPU: 0 PID: 155 at mm/slab_common.c:996 kmalloc_slab+0x1f/0x79 To: Fengguang Wu Cc: Arnd Bergmann , Riku Voipio , Frantisek Hrbata , Masahiro Yamada , linux-kernel@vger.kernel.org, lkp@01.org References: <20180419025854.uasnqkaflr45zeat@wfg-t540p.sh.intel.com> From: Peter Oberparleiter Date: Fri, 20 Apr 2018 13:08:07 +0200 MIME-Version: 1.0 In-Reply-To: <20180419025854.uasnqkaflr45zeat@wfg-t540p.sh.intel.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 x-cbid: 18042011-0040-0000-0000-0000044FAC61 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 18042011-0041-0000-0000-000020F40815 Message-Id: <4e2d71d1-e945-e2c3-cf8f-e19df52df6f5@linux.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2018-04-20_04:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=1 phishscore=0 bulkscore=0 spamscore=0 clxscore=1011 lowpriorityscore=0 impostorscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1709140000 definitions=main-1804200108 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 19.04.2018 04:58, Fengguang Wu wrote: > FYI this happens in mainline kernel 4.17.0-rc1. > It at least dates back to v4.5 . This is likely the result of compiling the kernel with GCC 7 while specifying that gcov-kernel should expect GCC <= 3.4 format data: dmesg: > (gcc version 7.3.0 (Debian 7.3.0-1)) #31 Mon Apr 16 23:17:50 CST 2018 .config: > # CONFIG_GCOV_FORMAT_AUTODETECT is not set > CONFIG_GCOV_FORMAT_3_4=y > # CONFIG_GCOV_FORMAT_4_7 is not set As such, it is an expected test failure. Assuming that this is a randconfig test, my recommendation would be to blacklist "CONFIG_GCOV_FORMAT_3_4=y" when using GCC >3.4. -- Peter Oberparleiter Linux on Z Development - IBM Germany