From mboxrd@z Thu Jan 1 00:00:00 1970 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 smtp.subspace.kernel.org (Postfix) with ESMTPS id 035E222CBD9; Fri, 27 Feb 2026 13:17:19 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=148.163.158.5 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772198241; cv=none; b=lGzpGhjQZcneOICQFE8g8HEr3glu5UpRzp6hx+MEVvcmwOzrfuOQaqcvx1r5oJjZUL87amrhJsTe/Uish00z/Kdejm+CL52IXEqkUPOPiBZXb+ntcXsxQlRzfu0th/iA9WDkp8xqRmeaZBf+N5mY0RWC2te8VMroQvv5tWxaXO4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772198241; c=relaxed/simple; bh=KdMe5UBcpVfnzxnFBjcFRrLpsIKDlzxCU4D7K4nxX9Q=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=s9avnEYx4wvy9ns9j315T9y8HYnrLrm0bJLykxProrhbSNpoBMln1UjOVGrMhSnPCOhjRriT3jN1RUalbOxO5ehnmWz+reanZ1ZsV54cDR709XBalPPFbusEfz1NNHxngi/rdAYyB0IKAqOmWTzwIgtKUt6T/iroDY67YaCuT0c= 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=BTJR2vm0; arc=none smtp.client-ip=148.163.158.5 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="BTJR2vm0" Received: from pps.filterd (m0356516.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.18.1.11/8.18.1.11) with ESMTP id 61R9viZC2757367; Fri, 27 Feb 2026 13:11:38 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=cc :content-type:date:from:in-reply-to:message-id:mime-version :references:subject:to; s=pp1; bh=6WjlJpHQKzBlWKVpwqyUEHBeZgBzSx Y5388W5FkL58k=; b=BTJR2vm0fDzeENYLqFYQ2dDe9icMrOXI9wTnvA2kiCnRXT gH1/CO/zfo9nMNHYB//RjWvssL7Jz3YhxGCku3qzLac2LDUj+0dZfWUUqhhdJmNg CPy2NxjTo1PaiA9DGaX+nGmfBW+JE7YTq0LUKBKIkNuBgL7s8XZQX723E/+JUjM1 WPGJGeayO4+Vg6u421YBaKJdFhjDfFUZdz9yRVNimgY+KXBROLbUzWiXYB6+DUJG br1pKLQCMoWE/yOg38mNMsGzlQFbBUZ2JqRh/H/TJTEUqHcC95Fq8kug6evVHJVf RoKAFgmg2zFe+LSbyCw3GXu81pVbzuwIaLvGK1kg== Received: from ppma22.wdc07v.mail.ibm.com (5c.69.3da9.ip4.static.sl-reverse.com [169.61.105.92]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 4cf24gv1u4-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 27 Feb 2026 13:11:37 +0000 (GMT) Received: from pps.filterd (ppma22.wdc07v.mail.ibm.com [127.0.0.1]) by ppma22.wdc07v.mail.ibm.com (8.18.1.2/8.18.1.2) with ESMTP id 61RAXfZm013419; Fri, 27 Feb 2026 13:11:36 GMT Received: from smtprelay04.fra02v.mail.ibm.com ([9.218.2.228]) by ppma22.wdc07v.mail.ibm.com (PPS) with ESMTPS id 4cfqdyjdvu-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 27 Feb 2026 13:11:36 +0000 Received: from smtpav06.fra02v.mail.ibm.com (smtpav06.fra02v.mail.ibm.com [10.20.54.105]) by smtprelay04.fra02v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 61RDBWJM31785484 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 27 Feb 2026 13:11:32 GMT Received: from smtpav06.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id EB4192004E; Fri, 27 Feb 2026 13:11:31 +0000 (GMT) Received: from smtpav06.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 05DDA20040; Fri, 27 Feb 2026 13:11:30 +0000 (GMT) Received: from osiris (unknown [9.87.152.66]) by smtpav06.fra02v.mail.ibm.com (Postfix) with ESMTPS; Fri, 27 Feb 2026 13:11:29 +0000 (GMT) Date: Fri, 27 Feb 2026 14:11:28 +0100 From: Heiko Carstens To: Nathan Chancellor Cc: Mathieu Desnoyers , Andrew Morton , linux-kernel@vger.kernel.org, "Paul E. McKenney" , Steven Rostedt , Masami Hiramatsu , Dennis Zhou , Tejun Heo , Christoph Lameter , Martin Liu , David Rientjes , christian.koenig@amd.com, Shakeel Butt , SeongJae Park , Michal Hocko , Johannes Weiner , Sweet Tea Dorminy , Lorenzo Stoakes , "Liam R . Howlett" , Mike Rapoport , Suren Baghdasaryan , Vlastimil Babka , Christian Brauner , Wei Yang , David Hildenbrand , Miaohe Lin , Al Viro , linux-mm@kvack.org, linux-trace-kernel@vger.kernel.org, Yu Zhao , Roman Gushchin , Mateusz Guzik , Matthew Wilcox , Baolin Wang , Aboorva Devarajan , Vasily Gorbik , linux-s390@vger.kernel.org Subject: Re: [PATCH v17 0/3] Improve proc RSS accuracy Message-ID: <20260227131128.10882B8b-hca@linux.ibm.com> References: <20260217161006.1105611-1-mathieu.desnoyers@efficios.com> <20260226120422.8101Cc2-hca@linux.ibm.com> <59b28cb4-4fff-4888-b562-7b7236e29d27@efficios.com> <73e6fea9-caf2-4404-b511-11646013f8db@efficios.com> <20260227011201.GA1577380@ax162> Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260227011201.GA1577380@ax162> X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Authority-Analysis: v=2.4 cv=TNRIilla c=1 sm=1 tr=0 ts=69a19809 cx=c_pps a=5BHTudwdYE3Te8bg5FgnPg==:117 a=5BHTudwdYE3Te8bg5FgnPg==:17 a=kj9zAlcOel0A:10 a=HzLeVaNsDn8A:10 a=VkNPw1HP01LnGYTKEx00:22 a=Mpw57Om8IfrbqaoTuvik:22 a=GgsMoib0sEa3-_RKJdDe:22 a=WbwKx_aOVzRSyFeedoMA:9 a=CjuIK1q_8ugA:10 X-Proofpoint-GUID: engyVFzmJTSGnUMACbHisbjpzir_4QkW X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMjI3MDExNiBTYWx0ZWRfX9eYZTNcw6g2P XnyXHaBQR2w4S6iIaEjeDrN3Tl4S5BS+b1ccOVoqOrlenCRnbcJI+UGA52lDiHrjUnH5IgtJvno d0GTfXcVAxMB/eamnwOZGZFB7lbsEi3zYsqCwtCIYQ+ZDgMsrX/4I4pAouHpsCK5YmueKAuLNcH Aiz5gXF6j5bgA7nUYcWI8UnfAa4vScjmTd5e4HOaO/GL0LociGszGw9NtkE0lk68neAlORVgXKf BpFR7pTI+cPo5bZgVIWD1cQ80vJbpxWQF1jQKVRiBKz6UbY/VqCRzMqgnCaYHKdqEylsBwIVZxO VUAKK+iSCqiklIaXW/E/vASlTdW8tIVGp8Sm+hg1oVqhqBrzzbMBalfblTXv3OUbfikLM2OxZYX IBVMMGaHAImkE/4DMwKPhkA/cITJnZKPWrx7DBFizU7qdDkdyMAST2awCKBLDs7GqhBDL9p2bE6 LQ+dt6dcbyObu2cSLkQ== X-Proofpoint-ORIG-GUID: jr70vzbDxhadr_F2vwxMHo9jZkWB_9Ig X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-02-27_02,2026-02-27_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 suspectscore=0 adultscore=0 priorityscore=1501 impostorscore=0 spamscore=0 clxscore=1015 bulkscore=0 lowpriorityscore=0 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2601150000 definitions=main-2602270116 On Thu, Feb 26, 2026 at 06:12:01PM -0700, Nathan Chancellor wrote: > Hi Mathieu, > > On Thu, Feb 26, 2026 at 02:38:04PM -0500, Mathieu Desnoyers wrote: > > I've successfully booted a defconfig s390x next-20260226 kernel in qemu > > with 1 and 4 CPUs, and within a nested s390x VM on 2 cpus. > > > > I guess I'll really need more info about your specific .config and > > command line args to help further. On s390 cpumask_set_cpu(0, mm_cpumask(&init_mm)); in arch_mm_preinit() writes out-of-bounds into swap_attrs[] overwriting the terminating NULL. This seems to happen because the return value of get_rss_stat_items_size() is larger than PERCPU_COUNTER_TREE_ITEMS_STATIC_SIZE: PERCPU_COUNTER_TREE_ITEMS_STATIC_SIZE: 18688 get_rss_stat_items_size(): 21504 Here I stopped looking further into this. I guess you will figure out immediately what's wrong :)