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 Received: from lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id DBB83C54798 for ; Tue, 27 Feb 2024 13:09:14 +0000 (UTC) Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=ibm.com header.i=@ibm.com header.a=rsa-sha256 header.s=pp1 header.b=dB7tQ/a+; dkim-atps=neutral Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4Tkd9P2njWz3dXS for ; Wed, 28 Feb 2024 00:09:13 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=ibm.com header.i=@ibm.com header.a=rsa-sha256 header.s=pp1 header.b=dB7tQ/a+; dkim-atps=neutral Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=linux.ibm.com (client-ip=148.163.158.5; helo=mx0b-001b2d01.pphosted.com; envelope-from=sachinp@linux.ibm.com; receiver=lists.ozlabs.org) Received: from mx0b-001b2d01.pphosted.com (mx0b-001b2d01.pphosted.com [148.163.158.5]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4Tkd8W4Ltcz3cDt for ; Wed, 28 Feb 2024 00:08:27 +1100 (AEDT) Received: from pps.filterd (m0356516.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 41RCX7wG004005; Tue, 27 Feb 2024 13:08:23 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=content-type : mime-version : subject : from : in-reply-to : date : cc : content-transfer-encoding : message-id : references : to; s=pp1; bh=Yg290spHizKK+yZgYqDMfQfUG4G9w4xV4ejIx2taWqM=; b=dB7tQ/a+sFvS4eE8JAiI5y/1cNXAAzSt8OdG/OJ1vopArcvaJd6eS8PlECAHJJhEdTzZ 0WG17x0QeYPcbHs2ivb4Ii8oClpaZfTkPc5waQtFK4CY5C+/Kv2Sw6nGc4UKvkK4qT3o /7pUCEqSUNS+8lt49ah4hlGLkjSjnWvNqI2UfOMByFbkpuLAZ2qFtAi6QbxiF3jS8jxh +TqoVLSYhe4AJ6x7/JdMEwnt/stbSYm3wEUVTQBjJKDIhWgYwqzQ92h1PDCTxQ3dJFGT DPcWQA3EfKstZ0wEYLcbx0DpyZ4maEXu94lU1qqhGBrZG+S7OCguuPf+s4/w0nyF/tPk ow== Received: from ppma11.dal12v.mail.ibm.com (db.9e.1632.ip4.static.sl-reverse.com [50.22.158.219]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 3whfu915ua-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 27 Feb 2024 13:08:23 +0000 Received: from pps.filterd (ppma11.dal12v.mail.ibm.com [127.0.0.1]) by ppma11.dal12v.mail.ibm.com (8.17.1.19/8.17.1.19) with ESMTP id 41RBcNYH012328; Tue, 27 Feb 2024 13:08:22 GMT Received: from smtprelay03.fra02v.mail.ibm.com ([9.218.2.224]) by ppma11.dal12v.mail.ibm.com (PPS) with ESMTPS id 3wfwg279ek-16 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 27 Feb 2024 13:08:22 +0000 Received: from smtpav05.fra02v.mail.ibm.com (smtpav05.fra02v.mail.ibm.com [10.20.54.104]) by smtprelay03.fra02v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 41R9aUMA57409918 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 27 Feb 2024 09:36:33 GMT Received: from smtpav05.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id E467A2004F; Tue, 27 Feb 2024 09:36:30 +0000 (GMT) Received: from smtpav05.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 251822004D; Tue, 27 Feb 2024 09:36:30 +0000 (GMT) Received: from smtpclient.apple (unknown [9.43.53.114]) by smtpav05.fra02v.mail.ibm.com (Postfix) with ESMTP; Tue, 27 Feb 2024 09:36:29 +0000 (GMT) Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 16.0 \(3774.300.61.1.2\)) Subject: Re: Kernel WARNING at lib/vsprintf.c:2721 while running ftrace kernel selftests From: Sachin Sant In-Reply-To: <20240226122208.344447f1@gandalf.local.home> Date: Tue, 27 Feb 2024 15:06:18 +0530 Content-Transfer-Encoding: quoted-printable Message-Id: <129D90CC-6DEB-4953-8061-EAA89F1ED514@linux.ibm.com> References: <20240226122208.344447f1@gandalf.local.home> To: Steven Rostedt X-Mailer: Apple Mail (2.3774.300.61.1.2) X-TM-AS-GCONF: 00 X-Proofpoint-GUID: zJJeUPcjJIoF26fkzIpQoFiR-offaynd X-Proofpoint-ORIG-GUID: zJJeUPcjJIoF26fkzIpQoFiR-offaynd X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.1011,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2024-02-26_11,2024-02-27_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 mlxscore=0 phishscore=0 priorityscore=1501 suspectscore=0 spamscore=0 adultscore=0 lowpriorityscore=0 impostorscore=0 mlxlogscore=855 bulkscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2311290000 definitions=main-2402270102 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linuxppc-dev Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" >> --- interrupt: c00 >> Code: f821ff91 2f890000 409e0034 7c0802a6 3c62fff0 39200001 3d420177 = 3863e310 992ad6db f8010080 4b209899 60000000 <0fe00000> e8010080 = 7c0803a6 2f9f0000=20 >> ---[ end trace 0000000000000000 ]=E2=80=94 >>=20 >> This warning is seen while running test that was added by >> following commit: >>=20 >> commit 3bf7009251f0f41cdd0188ab7b3879df81810703 >> tracing/selftests: Add test to test the trace_marker >=20 > This adds the user space selftest that triggered this warning, but it = is > not the cause of it. Could you run this test against kernel builds = before > this commit. Does this test cause this to trigger on older versions of = the > kernel? >=20 Running the mentioned test against an older kernel does not trigger this warning. # uname -r 6.7.0 # # ./ftracetest test.d/00basic/trace_marker.tc =3D=3D=3D Ftrace unit tests =3D=3D=3D [1] Basic tests on writing to trace_marker [PASS] [2] (instance) Basic tests on writing to trace_marker [PASS] # of passed: 2 # of failed: 0 # of unresolved: 0 # of untested: 0 # of unsupported: 0 # of xfailed: 0 # of undefined(test bug): 0 # I used this setup to again run bisect between 6.7.0 and 6.8-rc1. Bisect points to following patch=20 commit 8ec90be7f15fac42992ea821be929d3b06cd0fd9 tracing: Allow for max buffer data size trace_marker writes =E2=80=94 Sachin