From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E57E1C43387 for ; Thu, 3 Jan 2019 11:46:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id BD20521479 for ; Thu, 3 Jan 2019 11:46:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730684AbfACLqV convert rfc822-to-8bit (ORCPT ); Thu, 3 Jan 2019 06:46:21 -0500 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:56348 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1730181AbfACLqV (ORCPT ); Thu, 3 Jan 2019 06:46:21 -0500 Received: from pps.filterd (m0098413.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.22/8.16.0.22) with SMTP id x03BinGX122523 for ; Thu, 3 Jan 2019 06:46:20 -0500 Received: from e06smtp05.uk.ibm.com (e06smtp05.uk.ibm.com [195.75.94.101]) by mx0b-001b2d01.pphosted.com with ESMTP id 2psguw2hkw-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Thu, 03 Jan 2019 06:46:19 -0500 Received: from localhost by e06smtp05.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Thu, 3 Jan 2019 11:46:18 -0000 Received: from b06cxnps4074.portsmouth.uk.ibm.com (9.149.109.196) by e06smtp05.uk.ibm.com (192.168.101.135) with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Thu, 3 Jan 2019 11:46:15 -0000 Received: from b06wcsmtp001.portsmouth.uk.ibm.com (b06wcsmtp001.portsmouth.uk.ibm.com [9.149.105.160]) by b06cxnps4074.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x03BkEYw10879144 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Thu, 3 Jan 2019 11:46:15 GMT Received: from b06wcsmtp001.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id D451BA4068; Thu, 3 Jan 2019 11:46:14 +0000 (GMT) Received: from b06wcsmtp001.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id A49F7A4064; Thu, 3 Jan 2019 11:46:14 +0000 (GMT) Received: from osiris (unknown [9.152.212.95]) by b06wcsmtp001.portsmouth.uk.ibm.com (Postfix) with ESMTPS; Thu, 3 Jan 2019 11:46:14 +0000 (GMT) Date: Thu, 3 Jan 2019 12:46:13 +0100 From: Heiko Carstens To: Martin KaFai Lau , Eugene Syromyatnikov Cc: linux-kernel@vger.kernel.org, netdev@vger.kernel.org, Yonghong Song , Alexei Starovoitov , "Dmitry V. Levin" Subject: "bpf: Improve the info.func_info and info.func_info_rec_size behavior" breaks strace self tests X-TM-AS-GCONF: 00 x-cbid: 19010311-0020-0000-0000-000002FFF5B6 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19010311-0021-0000-0000-0000214FFF0C Message-Id: <20190103114613.GB3957@osiris> Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: 8BIT MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2019-01-03_05:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=487 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1901030105 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, the kernel commit 7337224fc150 ("bpf: Improve the info.func_info and info.func_info_rec_size behavior") breaks one of strace's self tests: FAIL: bpf-obj_get_info_by_fd-prog-v.gen Looking into the kernel commit, it seems that the user space visible uapi change is intentional; even though it might break existing user space. To reproduce: git clone https://gitlab.com/strace/strace.git cd strace ./bootstrap ./configure make -j $(nproc) cd tests make -j $(nproc) check