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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