From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx0a-001b2d01.pphosted.com (mx0a-001b2d01.pphosted.com [148.163.156.1]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9836A2737E3 for ; Wed, 22 Apr 2026 17:36:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=148.163.156.1 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776879390; cv=none; b=K/HbbdbF7g48BX9QO0uDye3kFieR6l8jcKYOxBJxEAkVxhDXY1nbkzhOi/nKCoWX6Xcijn6kKzHFHxz6EFGNSVCp3EJLm723yj2O6T8stMyalsjaHdESXi2IGxqx/NTIKKEFLs8LbW/YgYIVuuikOq4T6VEtQJKc11tmMRoF+ss= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776879390; c=relaxed/simple; bh=Uk+23ep+tZpY/WpE3EeHt/K9wHXIfbl//xmkje7rKT4=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=khzLHqby7x+FzXVvH8n3vmKUuIjDKdJKecUuM/2rCkd4P4mfcL4ghYvQyE05rwo8TY+C0kBRSrsIbh/NOpn7xmLAqNnv7NJ+kREE3dCN5HT5VkKFJzLBdXjWdRWZmjaxJIHsKI0vfVbDIq42Cf3f9Ael8miwMXzHJeU0BatCx/A= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.ibm.com; spf=pass smtp.mailfrom=linux.ibm.com; dkim=pass (2048-bit key) header.d=ibm.com header.i=@ibm.com header.b=i7EOUKez; arc=none smtp.client-ip=148.163.156.1 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.ibm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.ibm.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=ibm.com header.i=@ibm.com header.b="i7EOUKez" Received: from pps.filterd (m0360083.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.18.1.11/8.18.1.11) with ESMTP id 63MGMep03515444; Wed, 22 Apr 2026 17:36:20 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=cc :content-transfer-encoding:date:from:message-id:mime-version :subject:to; s=pp1; bh=s2BqK87P3busZvwnKMqLZKct+u+esfha5cyZCzHRZ kU=; b=i7EOUKezNPThLibWCTqm9JzX1lp+JxOtgcYWCSBB1wbgsfCWv/UaWSP6K jLKePsQCWhRTl/MSS/ouZVuZ5nccm1Tof1388I+qHgnZzpc0i4A9RpiVyOtGmZVJ BrsvBSc2tWKiYp+lLW7T85f+xwNOOlV+H4FoVoev8BkM/URWLsx4LOrxxTv4k2vS G3i8oKknqQYcoBb9ncdN1dMC91bvoQpNzhWBg4hd1xZTN8PEuRTZsgjdDiXWZjSQ Mklf0qrLz1PAllob4kW/29/0IrW5DzJ/jT9526QobFAvEeG+za6+FGpiPvpcRMTu yNz2FbyatguckwVrSQyQ0mXOcKD4A== 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 4dpeu24sgp-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 22 Apr 2026 17:36:19 +0000 (GMT) Received: from pps.filterd (ppma11.dal12v.mail.ibm.com [127.0.0.1]) by ppma11.dal12v.mail.ibm.com (8.18.1.7/8.18.1.7) with ESMTP id 63MHZKeV003564; Wed, 22 Apr 2026 17:36:18 GMT Received: from smtprelay06.fra02v.mail.ibm.com ([9.218.2.230]) by ppma11.dal12v.mail.ibm.com (PPS) with ESMTPS id 4dpjkxu7kv-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 22 Apr 2026 17:36:18 +0000 (GMT) Received: from smtpav01.fra02v.mail.ibm.com (smtpav01.fra02v.mail.ibm.com [10.20.54.100]) by smtprelay06.fra02v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 63MHaEo130409064 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 22 Apr 2026 17:36:14 GMT Received: from smtpav01.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id A613820043; Wed, 22 Apr 2026 17:36:14 +0000 (GMT) Received: from smtpav01.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id C721020040; Wed, 22 Apr 2026 17:36:11 +0000 (GMT) Received: from localhost.localdomain (unknown [9.39.30.235]) by smtpav01.fra02v.mail.ibm.com (Postfix) with ESMTP; Wed, 22 Apr 2026 17:36:11 +0000 (GMT) From: Athira Rajeev To: acme@kernel.org, jolsa@kernel.org, adrian.hunter@intel.com, mpetlan@redhat.com, tmricht@linux.ibm.com, maddy@linux.ibm.com, irogers@google.com, namhyung@kernel.org Cc: linux-perf-users@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, atrajeev@linux.ibm.com, hbathini@linux.vnet.ibm.com, Tejas.Manhas1@ibm.com, Tanushree.Shah@ibm.com, Shivani.Nittor@ibm.com Subject: [PATCH] perf sched: Fix crash in sched stats diff due to uninitialized perf_data structure Date: Wed, 22 Apr 2026 23:05:45 +0530 Message-Id: <20260422173545.73144-1-atrajeev@linux.ibm.com> X-Mailer: git-send-email 2.39.5 (Apple Git-154) Precedence: bulk X-Mailing-List: linux-perf-users@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNDIyMDE2NyBTYWx0ZWRfXz7XoSV/kWtvR YznATFeblMFplDhVI5eegDomNE30dm7QopcRBNthuIZSQ26z0MDEYeF3gw3m/SPoAy6CyfmRx0Y lgMUCRaJpyetNy/6ib6yhDOL14Srp0o3Xaos5r9xScB1HOVfNTNOoRXA77pSEDymYuwgOb/SRyT QULz66Z4YbiQhj/5q7Psdkr3/dx1k4YwNtifVks0/Q+CeS1TNsU4nyl2tcicY6cRFdyPriq7Yjj dAj+KkgbhP/W5S1vKj1qC+FM6MI6SPFsjnMn7QfvBJj61JPz56zgAUQOnCCHSo5SFDgKJRIBodL 5urd01EUcKWxXGI79+bpQLMfv8oPQywlncjGEKBACGLDB9zJQTn4iH6mQP77owVuWq6mpMpbm4z dBU4YMfswRY+uhp0CfhmhJaNL1RUo4q8yLUddU4nDYyMmkwRPgoPChnDKrD1+eXd5V0PgvdKPVv sZURajTxo+zFlOmHcjg== X-Proofpoint-ORIG-GUID: kO37_hnscnMYR81Tnn_nPId96kExk12C X-Proofpoint-GUID: NM2Xa-JT7Lu4q0-Md1peximJP9oTjLfd X-Authority-Analysis: v=2.4 cv=XMUAjwhE c=1 sm=1 tr=0 ts=69e90713 cx=c_pps a=aDMHemPKRhS1OARIsFnwRA==:117 a=aDMHemPKRhS1OARIsFnwRA==:17 a=A5OVakUREuEA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=iQ6ETzBq9ecOQQE5vZCe:22 a=VnNF1IyMAAAA:8 a=gqBEGFNiBRC4Mxh7sp8A:9 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-04-22_02,2026-04-21_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 clxscore=1015 priorityscore=1501 impostorscore=0 bulkscore=0 spamscore=0 lowpriorityscore=0 phishscore=0 adultscore=0 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2604200000 definitions=main-2604220167 perf sched stats diff fails sometimes with below logs: # perf sched stats record ls # perf sched stats diff *** invalid open64 call: O_CREAT or O_TMPFILE without mode ***: terminated Aborted (core dumped) Also in some runs, perf sched stats tests fails ./perf test "perf sched stats tests" 92: perf sched stats tests : FAILED! ==172375== Conditional jump or move depends on uninitialised value(s) ==172375== at 0x10393BD0: open_file_read (data.c:264) ==172375== by 0x10393F63: open_file (data.c:317) ==172375== by 0x10394067: open_file_dup (data.c:334) ==172375== by 0x103942DF: perf_data__open (data.c:379) ==172375== by 0x102F7CAF: __perf_session__new (session.c:169) ==172375== by 0x100B5E63: perf_session__new (session.h:116) ==172375== by 0x100D5D37: perf_sched__schedstat_diff (builtin-sched.c:4568) ==172375== by 0x100D7D6F: cmd_sched (builtin-sched.c:5061) ==172375== by 0x1010231F: run_builtin (perf.c:348) ==172375== by 0x1010262F: handle_internal_command (perf.c:398) ==172375== by 0x1010286F: run_argv (perf.c:442) ==172375== by 0x10102C67: main (perf.c:549) ==172375== ==172375== Conditional jump or move depends on uninitialised value(s) ==172375== at 0x10393D20: open_file_read (data.c:282) ==172375== by 0x10393F63: open_file (data.c:317) ==172375== by 0x10394067: open_file_dup (data.c:334) ==172375== by 0x103942DF: perf_data__open (data.c:379) ==172375== by 0x102F7CAF: __perf_session__new (session.c:169) ==172375== by 0x100B5E63: perf_session__new (session.h:116) ==172375== by 0x100D5D37: perf_sched__schedstat_diff (builtin-sched.c:4568) ==172375== by 0x100D7D6F: cmd_sched (builtin-sched.c:5061) ==172375== by 0x1010231F: run_builtin (perf.c:348) ==172375== by 0x1010262F: handle_internal_command (perf.c:398) ==172375== by 0x1010286F: run_argv (perf.c:442) ==172375== by 0x10102C67: main (perf.c:549) The valgrind logs and error message from the logs points to below snippet: static int open_file_read(struct perf_data *data) { int flags = data->in_place_update ? O_RDWR : O_RDONLY; struct stat st; int fd; fd = open(data->file.path, flags); The "struct perf_data" is defined here : static int perf_sched__schedstat_diff(struct perf_sched *sched, int argc, const char **argv) { struct cpu_domain_map **cd_map0 = NULL, **cd_map1 = NULL; struct list_head cpu_head_ses0, cpu_head_ses1; struct perf_session *session[2]; struct perf_data data[2]; int ret = 0, err = 0; static const char *defaults[] = { "perf.data.old", "perf.data", }; Here due to uninitialized "struct perf_data", the arguments to "open" is getting wrongly passed sometimes depending on value in stack. When perf_data__open() function calls open_file_read(),the "in_place_update" could contain garbage value. After initializing "struct perf_data" in perf_sched__schedstat_diff() function, perf sched stats tests runs without issues in multiple attempts and also "perf sched stats diff" ran individual without issues. for i in {0..20}; do ./perf test "perf sched stats tests"; done 92: perf sched stats tests : Ok 92: perf sched stats tests : Ok 92: perf sched stats tests : Ok 92: perf sched stats tests : Ok 92: perf sched stats tests : Ok 92: perf sched stats tests : Ok 92: perf sched stats tests : Ok 92: perf sched stats tests : Ok 92: perf sched stats tests : Ok 92: perf sched stats tests : Ok 92: perf sched stats tests : Ok 92: perf sched stats tests : Ok 92: perf sched stats tests : Ok 92: perf sched stats tests : Ok 92: perf sched stats tests : Ok 92: perf sched stats tests : Ok 92: perf sched stats tests : Ok 92: perf sched stats tests : Ok 92: perf sched stats tests : Ok 92: perf sched stats tests : Ok 92: perf sched stats tests : Ok Signed-off-by: Athira Rajeev --- tools/perf/builtin-sched.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tools/perf/builtin-sched.c b/tools/perf/builtin-sched.c index 555247568e7a..5d2740099eed 100644 --- a/tools/perf/builtin-sched.c +++ b/tools/perf/builtin-sched.c @@ -4538,7 +4538,7 @@ static int perf_sched__schedstat_diff(struct perf_sched *sched, struct cpu_domain_map **cd_map0 = NULL, **cd_map1 = NULL; struct list_head cpu_head_ses0, cpu_head_ses1; struct perf_session *session[2]; - struct perf_data data[2]; + struct perf_data data[2] = { 0 }; int ret = 0, err = 0; static const char *defaults[] = { "perf.data.old", -- 2.47.3